docs: compare cold grid and translated pan rendering alternatives

.gitattributes

@@ -12,12 +12,6 @@
 *.png binary
 *.jpg binary
 *.zip binary
-harness/scenario-selection-evidence-20260924/** -text whitespace=cr-at-eol
-harness/scenario-group-spacing-evidence-20260924/** -text whitespace=cr-at-eol
-harness/scenario-reorder-interaction-evidence-20260924/** -text whitespace=cr-at-eol
-harness/scenario-group-removal-evidence-20260925/** -text whitespace=cr-at-eol
-harness/scenario-removal-followup-evidence-20260925/** -text whitespace=cr-at-eol
-harness/fixtures/process-removal-removed-v2-20260925.arcadia -text whitespace=-blank-at-eol
 
 # Exact source/recovery oracles and archived ledgers retain their measured bytes.
 # Keep ordinary text diffs; only disable checkout/check-in newline conversion.
@@ -95,12 +89,3 @@ harness/experiments/analysis-source-s2a-windows-20260913/** -text whitespace=-bl
 
 # Preserve the pinned Iced dependency bytes and upstream manifest.
 crates/vendor/iced_widget/** -text whitespace=cr-at-eol
-
-# Preserve exact Process removal review and portable evidence bytes.
-harness/process-group-removal-evidence-20260925/** -text whitespace=cr-at-eol
-
-# Preserve exact saved-view planner review and portable evidence bytes.
-harness/saved-group-removal-evidence-20260925/** -text whitespace=cr-at-eol
-
-# Preserve exact saved-view application check records.
-harness/saved-group-removal-app-evidence-20260925/** -text whitespace=cr-at-eol

crates/oa-desktop/src/allocation_drag.rs

@@ -210,7 +210,6 @@ impl SemanticPlan {
     pub fn project(&self) -> &Project {
         &self.candidate
     }
-    #[cfg(test)]
     pub fn index(&self) -> &ViewIndex {
         &self.index
     }
@@ -485,6 +484,57 @@ pub struct PresentationContext {
     pub target: Option<TargetPresentation>,
 }
 
+impl PresentationContext {
+    fn header_visible(self, header: Rect, outgoing: bool) -> bool {
+        if !outgoing {
+            return self.viewport.contains(header);
+        }
+        // Leaving a performer must not require fitting the entire work card
+        // inside the camera. Retain a 24px grab region so the result stays
+        // directly reachable; geometry/model admission is independent.
+        let width = (header.position.x + header.size.width)
+            .min(self.viewport.position.x + self.viewport.size.width)
+            - header.position.x.max(self.viewport.position.x);
+        let height = (header.position.y + header.size.height)
+            .min(self.viewport.position.y + self.viewport.size.height)
+            - header.position.y.max(self.viewport.position.y);
+        width * self.zoom >= 24. && height * self.zoom >= 24.
+    }
+}
+
+#[test]
+fn outgoing_header_retains_a_grab_region_without_requiring_full_camera_containment() {
+    let context = PresentationContext {
+        viewport: Rect {
+            position: Position { x: 0., y: 0. },
+            size: Size {
+                width: 800.,
+                height: 400.,
+            },
+        },
+        zoom: 0.75,
+        target: None,
+    };
+    let mut header = Rect {
+        position: Position { x: -100., y: 30. },
+        size: Size {
+            width: 224.,
+            height: 62.,
+        },
+    };
+    assert!(context.header_visible(header, true));
+    assert!(!context.header_visible(header, false));
+    header.position.x = -192.; // exactly 32 world pixels = 24 logical pixels
+    assert!(context.header_visible(header, true));
+    header.position.x -= 1.;
+    assert!(!context.header_visible(header, true));
+    header.position.x = 0.;
+    header.position.y = 368.;
+    assert!(context.header_visible(header, true));
+    header.position.y += 1.;
+    assert!(!context.header_visible(header, true));
+}
+
 #[derive(Debug)]
 pub struct PlacementPlan {
     pub diagram: Diagram,
@@ -496,8 +546,8 @@ pub struct PlacementPlan {
     commands: Vec<Command>,
 }
 
-/// `requested` is the original selected placement position plus pointer motion
-/// in the frozen transform (therefore preserving the press offset). Snap only
+/// `requested` preserves the frozen pointer offset unless the caller proposes
+/// bounded outward clearance for an outgoing drop. Snap only
 /// this root; apply the resulting identical delta to captured Q and its routes.
 /// No whole Project clone, validator or semantic ViewIndex rebuild occurs here.
 pub fn place(
@@ -577,7 +627,7 @@ pub fn place(
             height: selected.size.height.min(62.),
         },
     };
-    if !presentation.viewport.contains(header) {
+    if !presentation.header_visible(header, plan.destination == Destination::OutsidePerformers) {
         return Err(Refusal::LayoutRequired(
             "Make room or adjust the view, then drag again.".into(),
         ));

crates/oa-desktop/src/allocation_drag/arrange.rs

@@ -188,7 +188,7 @@ pub fn place(
     };
     geometry::check_rigid(&plan.before_expanded, &expanded, &plan.placements, delta)?;
     scenes?;
-    geometry::check_headers(&view, &plan.selected, presentation.viewport)?;
+    geometry::check_headers(&view, &plan.selected, presentation, false)?;
     Ok(PlacementPlan {
         diagram,
         view,

crates/oa-desktop/src/allocation_drag/assignment.rs

@@ -398,7 +398,12 @@ pub fn place(
         &expanded,
     )?;
     geometry::check_rigid(&scope.0.before_expanded, &expanded, scope.affected(), delta)?;
-    geometry::check_headers(&view, scope.selected(), presentation.viewport)?;
+    geometry::check_headers(
+        &view,
+        scope.selected(),
+        presentation,
+        plan.destination == Destination::OutsidePerformers,
+    )?;
     Ok(PlacementPlan {
         diagram,
         view,

crates/oa-desktop/src/allocation_drag/geometry.rs

@@ -170,7 +170,8 @@ pub(super) fn check_rigid(
 pub(super) fn check_headers(
     view: &ProjectedView,
     selected: &BTreeMap<Id, Id>,
-    viewport: Rect,
+    presentation: PresentationContext,
+    outgoing: bool,
 ) -> Result<(), Refusal> {
     for (id, element) in selected {
         let node = view
@@ -185,7 +186,7 @@ pub(super) fn check_headers(
                 height: node.size.height.min(62.),
             },
         };
-        if !viewport.contains(header) {
+        if !presentation.header_visible(header, outgoing) {
             return Err(Refusal::LayoutRequired(
                 "Make room or adjust the view, then drag again.".into(),
             ));

crates/oa-desktop/src/allocation_input.rs

@@ -60,7 +60,6 @@ impl Root<'_> {
             return false;
         }
         let canvas = DiagramCanvas {
-            removal_input: &self.app.saved_removal_input,
             selection: self.app.diagram_selection.as_ref(),
             allocation: Some(self.app.allocation_capability()),
             project: self.app.project(),

crates/oa-desktop/src/app.rs

@@ -19,18 +19,12 @@ mod hosted;
 pub(crate) mod multiselect;
 #[cfg(test)]
 mod multiselect_tests;
-pub(crate) mod process_removal;
 mod reference_authoring;
-mod removal_review;
 #[cfg(test)]
 mod review_navigation_tests;
-pub(crate) mod saved_removal;
 #[cfg(test)]
 mod scenario_details_tests;
 mod scenario_diagram;
-mod scenario_multiselect;
-pub(crate) mod scenario_removal;
-pub(crate) mod scenario_reorder;
 mod scenario_spacing;
 #[cfg(test)]
 mod source_indentation_tests;
@@ -221,14 +215,11 @@ mod direct_scenario_tests {
         let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Select(
             context, f.sender,
         )));
-        let fresh = app.scenario_context().unwrap();
-        assert_eq!(fresh.visit, context.visit);
-        assert_eq!(fresh.representation, context.representation);
-        assert_ne!(
-            fresh.epoch, context.epoch,
-            "selection retires older gestures"
+        assert_eq!(
+            app.scenario_context(),
+            Some(context),
+            "same-owner selection retains gesture context"
         );
-        let context = fresh;
         let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Reorder {
             context,
             occurrence: created,
@@ -446,10 +437,6 @@ pub enum Message {
     BehaviorDiagram(Choice),
     StateDiagram(crate::behavior::state_edit::Event),
     ScenarioCanvas(crate::behavior::scenario::CanvasEvent),
-    ScenarioReorder(Box<scenario_reorder::Event>),
-    ScenarioRemoval(Box<scenario_removal::Event>),
-    ProcessRemoval(Box<process_removal::Event>),
-    SavedRemoval(Box<saved_removal::Event>),
     TopologyCanvas(crate::behavior::topology::CanvasEvent),
     PlaceSelected,
     HideSelected,
@@ -536,14 +523,12 @@ pub struct App {
     pub guide: crate::guide::State,
     pub traceability: crate::views::traceability::State,
     pub behavior: crate::behavior::State,
-    pub(crate) scenario_reorder: scenario_reorder::State,
     pub data_state: crate::data_view::State,
     pub inspector_tab: crate::navigation::InspectorTab,
     pub layer: Layer,
     pub selected: Id,
     pub selected_node: Option<Id>,
     pub diagram_selection: Option<crate::diagram_selection::Selection>,
-    pub(crate) saved_removal_input: crate::removal_input::Lifetime,
     pub draft: Option<Draft>,
     pub active_diagram: Option<Id>,
     pub search: String,
@@ -660,14 +645,12 @@ impl App {
             guide: crate::guide::State::default(),
             traceability: Default::default(),
             behavior: Default::default(),
-            scenario_reorder: Default::default(),
             data_state: Default::default(),
             inspector_tab: Default::default(),
             layer,
             selected,
             selected_node: None,
             diagram_selection: None,
-            saved_removal_input: Default::default(),
             draft,
             active_diagram,
             search: String::new(),
@@ -1365,128 +1348,8 @@ impl App {
         ])
     }
     pub fn update(&mut self, message: Message) -> Task<Message> {
-        // Group dialogs only accept their stamped Cancel button. A delayed
-        // singleton dialog packet cannot close a later aggregate review.
-        if matches!(message, Message::CancelDelete)
-            && self.delete_target.as_ref().is_some_and(|target| {
-                target.scenario.is_some() || target.process.is_some() || target.saved.is_some()
-            })
-        {
-            return Task::none();
-        }
-        if let Message::SavedRemoval(event) = message {
-            return self.saved_removal_event(*event);
-        }
-        if let Message::StateDiagram(behavior::state_edit::Event::ModelRemoval(event)) = message {
-            return self.saved_removal_event(*event);
-        }
-        if let Message::ProcessRemoval(event) = message {
-            return self.process_removal_event(*event);
-        }
-        // Process review Escape is captured with its token by the root widget.
-        if matches!(message, Message::Escape)
-            && self
-                .delete_target
-                .as_ref()
-                .is_some_and(|target| target.process.is_some() || target.saved.is_some())
-        {
-            return Task::none();
-        }
-        if let Message::ScenarioRemoval(event) = message {
-            return self.scenario_removal_event(*event);
-        }
-        if let Message::ConfirmDelete(token) = &message {
-            if self
-                .delete_target
-                .as_ref()
-                .is_none_or(|target| target.snapshot.token != *token)
-            {
-                return Task::none();
-            }
-            if self
-                .delete_target
-                .as_ref()
-                .is_some_and(|target| target.saved.is_some())
-            {
-                self.confirm_saved_removal(*token);
-                return Task::none();
-            }
-            if self
-                .delete_target
-                .as_ref()
-                .is_some_and(|target| target.scenario.is_some())
-            {
-                self.confirm_scenario_removal(*token);
-                return Task::none();
-            }
-            if self
-                .delete_target
-                .as_ref()
-                .is_some_and(|target| target.process.is_some())
-            {
-                self.confirm_process_removal(*token);
-                return Task::none();
-            }
-        }
-        // Captured reorder packets must be admitted before shared navigation,
-        // camera or source boundaries can disturb a newer operation.
-        if let Message::ScenarioReorder(event) = message {
-            return self.scenario_reorder_event(*event);
-        }
-        if let Message::ScenarioCanvas(behavior::scenario::CanvasEvent::Selection(event)) = message
-        {
-            return self.scenario_selection_event(*event);
-        }
-        // A delayed Scenario menu cannot retire the current reveal/gesture even
-        // when it uses the same semantic owner after a representation round trip.
-        if let Message::Menu(crate::model_menu::Event::Open(request)) = &message
-            && (request.scenario.is_some() || request.process.is_some() || request.canvas.is_some())
-            && crate::model_menu::Opened::new(self, request.clone(), self.menu_sequence).is_none()
-        {
-            return Task::none();
-        }
-        if let Message::Menu(crate::model_menu::Event::Invoke(token, _)) = &message
-            && let Some(menu) = &self.model_menu
-            && (menu.request.scenario.is_some()
-                || menu.request.process.is_some()
-                || menu.request.canvas.is_some())
-            && (menu.token != *token || !menu.valid(self))
-        {
-            // Consume an expired menu's own packet without touching a newer
-            // menu or crossing source/selection boundaries.
-            if menu.token == *token {
-                self.model_menu = None;
-            }
-            return Task::none();
-        }
-        if self.scenario_group_selected()
-            && matches!(
-                &message,
-                Message::Command(Command::MoveStep(..)) | Message::Delete
-            )
-        {
-            self.status =
-                "Use Reorder or Remove above the canvas to act on the complete Scenario selection."
-                    .into();
-            return Task::none();
-        }
-        if self.topology_context().is_some()
-            && self
-                .multiselect_snapshot()
-                .is_some_and(|s| s.targets().len() > 1)
-            && matches!(&message, Message::Delete)
-        {
-            self.status =
-                "Use Remove selected above the canvas to review the complete Process selection."
-                    .into();
-            return Task::none();
-        }
         let preview_read_only = self.process_preview_primary().is_some();
         let selection_boundary = self.multiselect_boundary();
-        let scenario_selection_before = self.scenario_context().and_then(|context| {
-            self.multiselect_snapshot()
-                .map(|selection| (context, selection))
-        });
         // Reject delayed gestures before they can retire newer input ownership.
         if let Message::Connection(
             crate::connection_edit::Event::Endpoint(captured, _)
@@ -1655,16 +1518,6 @@ impl App {
             }) {
                 return Task::none();
             }
-            if self.scenario_group_selected()
-                && matches!(
-                    event,
-                    behavior::scenario::CanvasEvent::Select(..)
-                        | behavior::scenario::CanvasEvent::Remove(..)
-                        | behavior::scenario::CanvasEvent::Reorder { .. }
-                )
-            {
-                return Task::none();
-            }
             // Passive layout/form reports retain their existing epoch rules;
             // camera input uses its separate lifetime below. All other actions
             // must match the exact context before shared reveal reconciliation.
@@ -1752,20 +1605,9 @@ impl App {
         {
             self.reconcile_multiselect();
         }
-        if let Some((context, selection)) = scenario_selection_before
-            && self.scenario_context() == Some(context)
-            && self.multiselect_snapshot().as_ref() != Some(&selection)
-        {
-            // Legacy singleton selection retires old spacing packets. If the
-            // action already advanced its context, its new navigation/reveal
-            // owns that context and must not be retired by reconciliation.
-            self.behavior.scenario.cancel_spacing();
-            self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-        }
         if preview_read_only && self.process_preview_primary().is_none() && self.draft.is_none() {
             self.refresh_draft();
         }
-        self.scenario_reorder_reconcile();
         task
     }
     fn behavior_control(&mut self, intent: behavior::canvas_workspace::Intent) -> Task<Message> {
@@ -2316,10 +2158,6 @@ impl App {
             }
             Message::CheckpointLoaded(result) => return self.checkpoint_loaded(result),
             Message::Hosted(event) => return self.hosted_event(event),
-            Message::ScenarioReorder(event) => return self.scenario_reorder_event(*event),
-            Message::ScenarioRemoval(event) => return self.scenario_removal_event(*event),
-            Message::ProcessRemoval(event) => return self.process_removal_event(*event),
-            Message::SavedRemoval(event) => return self.saved_removal_event(*event),
             Message::ScenarioCanvas(event) => {
                 use crate::behavior::scenario::{self, CanvasEvent};
                 let context = event.context();
@@ -2828,9 +2666,6 @@ impl App {
                 if request.process.is_some() {
                     request.process = self.topology_context().map(Box::new);
                 }
-                if request.scenario.is_some() {
-                    request.scenario = self.scenario_context().map(Box::new);
-                }
                 self.model_menu = crate::model_menu::Opened::new(self, request, self.menu_sequence);
             }
             Message::Menu(crate::model_menu::Event::Close) => {
@@ -2860,21 +2695,9 @@ impl App {
                         "Apply or revert pending edits before using modeling actions.".into();
                     return Task::none();
                 }
-                if matches!(
-                    *action,
-                    Message::DiagramSelection(_) | Message::SavedRemoval(_)
-                ) || (menu.request.process.is_some()
-                    && matches!(
-                        *action,
-                        Message::TopologyCanvas(_) | Message::ProcessRemoval(_)
-                    ))
-                    || (menu.request.scenario.is_some()
-                        && matches!(
-                            *action,
-                            Message::ScenarioCanvas(_)
-                                | Message::ScenarioReorder(_)
-                                | Message::ScenarioRemoval(_)
-                        ))
+                if matches!(*action, Message::DiagramSelection(_))
+                    || (menu.request.process.is_some()
+                        && matches!(*action, Message::TopologyCanvas(_)))
                 {
                     return self.update(*action);
                 }
@@ -2917,10 +2740,6 @@ impl App {
                 return self.update(Message::Add(child));
             }
             Message::Escape => {
-                if self.scenario_reorder.session.is_some() {
-                    self.scenario_reorder_cancel();
-                    return Task::none();
-                }
                 let restore_source_focus = self.source_navigation_available()
                     && (self.source_navigation.open || self.text_workspace.drawer().is_some());
                 let dismiss_find_only = restore_source_focus && self.source_navigation.open;
@@ -3789,9 +3608,9 @@ impl App {
                     .is_some_and(|s| s.targets().len() > 1)
                 {
                     self.status = if self.topology_context().is_some() {
-                        "Use Remove selected above the canvas to review the complete Process selection."
+                        "Group removal needs an aggregate review. Select one contribution to remove it individually."
                     } else {
-                        "Use Delete from model above the canvas to review the complete selection, or Hide selected to remove placements."
+                        "Group model-deletion review is not available yet. Select one element or use Hide selected."
                     }.into();
                     return Task::none();
                 }

crates/oa-desktop/src/app/allocation_drag.rs

@@ -14,6 +14,8 @@ use std::{
     sync::Arc,
 };
 
+mod clearance;
+
 pub const FINISH_EDIT: &str =
     "Finish or cancel the current edit before selecting or moving elements.";
 
@@ -56,6 +58,7 @@ pub struct Target {
 #[derive(Debug, Clone)]
 pub struct Frozen {
     pub targets: Vec<Target>,
+    pub moving: Vec<Rectangle>,
     cards: Vec<Rectangle>,
     controls: Vec<Rectangle>,
     edges: Vec<(Point, Point)>,
@@ -82,14 +85,16 @@ impl Frozen {
     ) -> Self {
         let mut targets = Vec::new();
         let mut cards = Vec::new();
+        let mut moving = Vec::new();
         for n in &view.nodes {
-            if affected.contains_key(&n.id) {
-                continue;
-            }
             let region = Rectangle::new(
                 Point::new(n.position.x, n.position.y),
                 iced::Size::new(n.size.width, n.size.height),
             );
+            if affected.contains_key(&n.id) {
+                moving.push(region);
+                continue;
+            }
             let Some(e) = project.elements.get(&n.element) else {
                 cards.push(region);
                 continue;
@@ -172,6 +177,7 @@ impl Frozen {
         }
         Self {
             targets,
+            moving,
             cards,
             controls,
             edges,
@@ -407,7 +413,6 @@ impl Candidate {
             Self::Performers(p) => &p.accepted,
         }
     }
-    #[cfg(test)]
     pub fn index(&self) -> &view_options::ViewIndex {
         match self {
             Self::Singleton(p) => p.index(),
@@ -525,6 +530,8 @@ pub(crate) struct Feedback {
     pub inspection_targets: Vec<usize>,
     pub text: String,
     pub refused: bool,
+    /// Pointer-following outline only; it never authorizes a model change.
+    pub ghost_delta: Option<Vector>,
 }
 impl Feedback {
     pub fn inspection_identity(&self) -> String {
@@ -1055,7 +1062,26 @@ impl App {
                         viewport: stamp.viewport(), zoom: stamp.zoom,
                         target: target.map(|i| plan::TargetPresentation { placement: active.frozen.as_ref().unwrap().targets[i].placement }),
                     };
-                    let placed = candidate.place(requested, presentation).map_err(|r| refusal(&r))?;
+                    let exact = candidate.place(requested, presentation);
+                    let placed = if destination == plan::Destination::OutsidePerformers
+                        && matches!(&exact, Err(plan::Refusal::LayoutRequired(_)))
+                    {
+                        let affected = match &active.prepared {
+                            Prepared::Singleton(scope) => Some(&scope.placements),
+                            Prepared::Assignment(scope) => Some(scope.affected()),
+                            _ => None,
+                        };
+                        affected.and_then(|affected| {
+                            clearance::requests(
+                                (self.project(), self.document.view_index()),
+                                (candidate.project(), candidate.index()), stamp.context.diagram,
+                                affected, *anchor, requested,
+                                (stamp.world(press.start), stamp.world(pointer.unwrap())),
+                            ).into_iter().find_map(|position| candidate.place(position, presentation).ok())
+                        }).map_or(exact, Ok)
+                    } else {
+                        exact
+                    }.map_err(|r| refusal(&r))?;
                     let label = candidate.label();
                     if release {
                         if let Some(command) = candidate.finish(self.project(), &placed).map_err(|r| refusal(&r))? {
@@ -1082,6 +1108,14 @@ impl App {
         } else {
             let inspection_targets = active.inspection_targets.clone();
             let frozen = active.frozen.clone();
+            // A rejected intermediate position is not a return gesture. Keep the
+            // last admitted scene and show current motion separately; release
+            // always recomputes admission and never commits this retained view.
+            if refused && in_bounds && preview.is_none() {
+                preview = self.allocation_drag.preview.take();
+            }
+            let ghost_delta = (refused && in_bounds)
+                .then(|| (pointer.unwrap() - press.start) * (1. / stamp.zoom));
             self.allocation_drag.active = Some(active);
             self.allocation_drag.preview = preview;
             self.allocation_drag.feedback = Some(Feedback {
@@ -1092,6 +1126,7 @@ impl App {
                 inspection_targets,
                 text,
                 refused,
+                ghost_delta,
             });
         }
     }

crates/oa-desktop/src/app/allocation_drag/clearance.rs

@@ -0,0 +1,595 @@
+//! Bounded outgoing clearance proposals. The ordinary placement and semantic
+//! validators still decide whether any proposal may be previewed or committed.
+use iced::Point;
+use oa_core::{Id, NodePlacement, Position, Project, projection, view_options::ViewIndex};
+use std::collections::{BTreeMap, BTreeSet};
+
+const GRID: f32 = 10.;
+const GAP: f32 = 10.;
+
+#[derive(Clone, Copy)]
+struct Bounds {
+    left: f32,
+    top: f32,
+    right: f32,
+    bottom: f32,
+}
+
+impl Bounds {
+    fn node(node: &projection::ProjectedNode) -> Option<Self> {
+        let result = Self {
+            left: node.position.x,
+            top: node.position.y,
+            right: node.position.x + node.size.width,
+            bottom: node.position.y + node.size.height,
+        };
+        ([result.left, result.top, result.right, result.bottom]
+            .iter()
+            .all(|value| value.is_finite())
+            && result.right > result.left
+            && result.bottom > result.top)
+            .then_some(result)
+    }
+
+    fn union(self, other: Self) -> Self {
+        Self {
+            left: self.left.min(other.left),
+            top: self.top.min(other.top),
+            right: self.right.max(other.right),
+            bottom: self.bottom.max(other.bottom),
+        }
+    }
+
+    fn overlaps(self, other: Self) -> bool {
+        self.left < other.right
+            && other.left < self.right
+            && self.top < other.bottom
+            && other.top < self.bottom
+    }
+}
+
+/// Called only after an OutsidePerformers candidate fails ordinary placement.
+/// Coordinates use the frozen world transform. The entire affected footprint
+/// receives one anchor translation; this never moves or packs other cards.
+pub(super) fn requests(
+    accepted: (&Project, &ViewIndex),
+    candidate: (&Project, &ViewIndex),
+    diagram: Id,
+    affected: &BTreeMap<Id, NodePlacement>,
+    anchor: Id,
+    requested: Position,
+    motion: (Point, Point),
+) -> Vec<Position> {
+    let (accepted, accepted_index) = accepted;
+    let (candidate, candidate_index) = candidate;
+    let (start, pointer) = motion;
+    if ![
+        requested.x,
+        requested.y,
+        start.x,
+        start.y,
+        pointer.x,
+        pointer.y,
+    ]
+    .iter()
+    .all(|value| value.is_finite())
+    {
+        return Vec::new();
+    }
+    let (Some(original), Some(base), Some(anchor)) = (
+        accepted.diagrams.get(&diagram),
+        candidate.diagrams.get(&diagram),
+        affected.get(&anchor),
+    ) else {
+        return Vec::new();
+    };
+    let snapped = Position {
+        x: (requested.x / GRID).round() * GRID,
+        y: (requested.y / GRID).round() * GRID,
+    };
+    let delta = Position {
+        x: snapped.x - anchor.position.x,
+        y: snapped.y - anchor.position.y,
+    };
+    let before = projection::project_diagram_with_index(accepted, original, accepted_index);
+    let before_nodes: BTreeMap<_, _> = before.nodes.iter().map(|node| (node.id, node)).collect();
+    let mut sources = BTreeSet::new();
+    for node in before
+        .nodes
+        .iter()
+        .filter(|node| affected.contains_key(&node.id))
+    {
+        let mut parent = node.visual_parent;
+        let mut seen = BTreeSet::new();
+        while let Some(id) = parent {
+            if !seen.insert(id) {
+                return Vec::new();
+            }
+            let Some(node) = before_nodes.get(&id) else {
+                break;
+            };
+            if !affected.contains_key(&id)
+                && accepted
+                    .elements
+                    .get(&node.element)
+                    .is_some_and(|element| element.kind().is_performer())
+            {
+                sources.insert(id);
+            }
+            parent = node.visual_parent;
+        }
+    }
+    if sources.is_empty() {
+        return Vec::new();
+    }
+    // Projection after responsibility removal supplies the former performer's
+    // remaining enclosure, including other allocated work. Projecting the moved
+    // block also includes the full visible descendant enclosure of every root.
+    let mut moved = base.clone();
+    for (id, captured) in affected {
+        let Some(node) = moved.nodes.get_mut(id) else {
+            return Vec::new();
+        };
+        node.position = Position {
+            x: captured.position.x + delta.x,
+            y: captured.position.y + delta.y,
+        };
+        if ![
+            node.position.x,
+            node.position.y,
+            node.size.width,
+            node.size.height,
+        ]
+        .iter()
+        .all(|value| value.is_finite())
+        {
+            return Vec::new();
+        }
+    }
+    let after = projection::project_diagram_with_index(candidate, &moved, candidate_index);
+    let mut footprint: Option<Bounds> = None;
+    for node in after
+        .nodes
+        .iter()
+        .filter(|node| affected.contains_key(&node.id))
+    {
+        let Some(bounds) = Bounds::node(node) else {
+            return Vec::new();
+        };
+        footprint = Some(footprint.map_or(bounds, |previous| previous.union(bounds)));
+    }
+    let Some(footprint) = footprint else {
+        return Vec::new();
+    };
+    let mut overlaps = Vec::new();
+    for node in after.nodes.iter().filter(|node| sources.contains(&node.id)) {
+        let (Some(old), Some(current)) = (Bounds::node(before_nodes[&node.id]), Bounds::node(node))
+        else {
+            return Vec::new();
+        };
+        if footprint.overlaps(current) {
+            overlaps.push((old, current));
+        }
+    }
+    if overlaps.is_empty() {
+        return Vec::new();
+    }
+
+    // Each entry is a half-plane actually crossed by the pointer. At a corner,
+    // prefer the boundary reached first on the press-to-pointer segment. The
+    // direction index is a stable tie-break, independent of placement UUIDs.
+    let mut crossings = [None::<f32>; 4];
+    for (old, _) in &overlaps {
+        for (direction, initial, final_, boundary, outward) in [
+            (
+                0,
+                start.x,
+                pointer.x,
+                old.left,
+                pointer.x < old.left && start.x >= old.left,
+            ),
+            (
+                1,
+                start.x,
+                pointer.x,
+                old.right,
+                pointer.x >= old.right && start.x < old.right,
+            ),
+            (
+                2,
+                start.y,
+                pointer.y,
+                old.top,
+                pointer.y < old.top && start.y >= old.top,
+            ),
+            (
+                3,
+                start.y,
+                pointer.y,
+                old.bottom,
+                pointer.y >= old.bottom && start.y < old.bottom,
+            ),
+        ] {
+            if outward {
+                let fraction = (boundary - initial) / (final_ - initial);
+                if fraction.is_finite() && (0. ..=1.).contains(&fraction) {
+                    crossings[direction] =
+                        Some(crossings[direction].map_or(fraction, |old| old.min(fraction)));
+                }
+            }
+        }
+    }
+    let mut directions: Vec<_> = crossings
+        .into_iter()
+        .enumerate()
+        .filter_map(|(direction, fraction)| fraction.map(|fraction| (direction, fraction)))
+        .collect();
+    directions.sort_by(|a, b| a.1.total_cmp(&b.1).then(a.0.cmp(&b.0)));
+    let mut result = Vec::new();
+    for (direction, _) in directions {
+        let mut corrected = snapped;
+        match direction {
+            0 => {
+                let edge = overlaps
+                    .iter()
+                    .map(|(_, current)| current.left)
+                    .fold(f32::INFINITY, f32::min);
+                corrected.x = ((snapped.x + edge - GAP - footprint.right) / GRID).floor() * GRID;
+            }
+            1 => {
+                let edge = overlaps
+                    .iter()
+                    .map(|(_, current)| current.right)
+                    .fold(f32::NEG_INFINITY, f32::max);
+                corrected.x = ((snapped.x + edge + GAP - footprint.left) / GRID).ceil() * GRID;
+            }
+            2 => {
+                let edge = overlaps
+                    .iter()
+                    .map(|(_, current)| current.top)
+                    .fold(f32::INFINITY, f32::min);
+                corrected.y = ((snapped.y + edge - GAP - footprint.bottom) / GRID).floor() * GRID;
+            }
+            3 => {
+                let edge = overlaps
+                    .iter()
+                    .map(|(_, current)| current.bottom)
+                    .fold(f32::NEG_INFINITY, f32::max);
+                corrected.y = ((snapped.y + edge + GAP - footprint.top) / GRID).ceil() * GRID;
+            }
+            _ => unreachable!(),
+        }
+        if corrected.x.is_finite() && corrected.y.is_finite() && !result.contains(&corrected) {
+            result.push(corrected);
+        }
+    }
+    result
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::allocation_drag as plan;
+    use oa_core::{Kind, Layer, ProjectionKind, RelationKind, Size};
+
+    struct Fixture {
+        project: Project,
+        diagram: Id,
+        performer: Id,
+        work: Id,
+        node: Id,
+    }
+
+    fn xy(x: f32, y: f32) -> Position {
+        Position { x, y }
+    }
+
+    fn fixture(layer: Layer) -> Fixture {
+        let mut project = Project::empty();
+        let (performer, work) = match layer {
+            Layer::Oa => (Kind::Entity, Kind::Activity),
+            Layer::Sa => (Kind::System, Kind::Function),
+        };
+        let performer = project
+            .add_element(performer, layer, "Performer", None)
+            .unwrap();
+        let work = project.add_element(work, layer, "Work", None).unwrap();
+        let diagram = project.ensure_diagram(layer);
+        project.diagrams.get_mut(&diagram).unwrap().projection = ProjectionKind::Allocation;
+        let performer = project.place(diagram, performer, xy(100., 100.));
+        project
+            .diagrams
+            .get_mut(&diagram)
+            .unwrap()
+            .nodes
+            .get_mut(&performer)
+            .unwrap()
+            .size = Size {
+            width: 400.,
+            height: 250.,
+        };
+        let node = project.place(diagram, work, xy(160., 180.));
+        let owner = project.diagrams[&diagram].nodes[&performer].element;
+        project.relate(RelationKind::Allocation, "Responsibility", owner, work);
+        Fixture {
+            project,
+            diagram,
+            performer,
+            work,
+            node,
+        }
+    }
+
+    fn semantic(f: &Fixture) -> (plan::Scope, plan::SemanticPlan) {
+        let scope = plan::capture(&f.project, f.diagram, f.work, f.node).unwrap();
+        let semantic = plan::plan_semantics(
+            &f.project,
+            &scope,
+            plan::Destination::OutsidePerformers,
+            &BTreeMap::new(),
+        )
+        .unwrap();
+        (scope, semantic)
+    }
+
+    fn presentation() -> plan::PresentationContext {
+        plan::PresentationContext {
+            viewport: plan::Rect {
+                position: xy(-2000., -2000.),
+                size: Size {
+                    width: 5000.,
+                    height: 5000.,
+                },
+            },
+            zoom: 1.,
+            target: None,
+        }
+    }
+
+    #[test]
+    fn each_outgoing_edge_clears_the_source_and_passes_ordinary_placement() {
+        for layer in [Layer::Oa, Layer::Sa] {
+            let f = fixture(layer);
+            let (scope, semantic) = semantic(&f);
+            for (start, pointer, requested, expected) in [
+                (
+                    Point::new(170., 210.),
+                    Point::new(99., 210.),
+                    xy(89., 180.),
+                    xy(-140., 180.),
+                ),
+                (
+                    Point::new(340., 210.),
+                    Point::new(501., 210.),
+                    xy(321., 180.),
+                    xy(510., 180.),
+                ),
+                (
+                    Point::new(200., 190.),
+                    Point::new(200., 99.),
+                    xy(160., 89.),
+                    xy(160., -10.),
+                ),
+                (
+                    Point::new(200., 260.),
+                    Point::new(200., 351.),
+                    xy(160., 271.),
+                    xy(160., 360.),
+                ),
+            ] {
+                assert!(matches!(
+                    plan::place(&semantic, requested, presentation()),
+                    Err(plan::Refusal::LayoutRequired(_))
+                ));
+                let proposed = requests(
+                    (&f.project, &ViewIndex::new(&f.project)),
+                    (semantic.project(), semantic.index()),
+                    f.diagram,
+                    &scope.placements,
+                    f.node,
+                    requested,
+                    (start, pointer),
+                );
+                assert_eq!(proposed, vec![expected]);
+                let placed = plan::place(&semantic, proposed[0], presentation()).unwrap();
+                assert!(
+                    plan::finish(&semantic, &f.project, &placed)
+                        .unwrap()
+                        .is_some()
+                );
+            }
+        }
+    }
+
+    #[test]
+    fn source_shrink_uses_candidate_enclosure_not_frozen_target() {
+        let mut f = fixture(Layer::Oa);
+        f.project
+            .diagrams
+            .get_mut(&f.diagram)
+            .unwrap()
+            .nodes
+            .get_mut(&f.performer)
+            .unwrap()
+            .size = Size {
+            width: 224.,
+            height: 94.,
+        };
+        let (scope, semantic) = semantic(&f);
+        let proposed = requests(
+            (&f.project, &ViewIndex::new(&f.project)),
+            (semantic.project(), semantic.index()),
+            f.diagram,
+            &scope.placements,
+            f.node,
+            xy(229., 180.),
+            (Point::new(340., 210.), Point::new(409., 210.)),
+        );
+        assert_eq!(proposed, vec![xy(340., 180.)]);
+        plan::place(&semantic, proposed[0], presentation()).unwrap();
+    }
+
+    #[test]
+    fn corner_order_follows_boundary_crossing_and_is_deterministic() {
+        let f = fixture(Layer::Sa);
+        let (scope, semantic) = semantic(&f);
+        // Right crossed at 160/161 of the segment; bottom at 90/91.
+        let args = (
+            xy(321., 271.),
+            Point::new(340., 260.),
+            Point::new(501., 351.),
+        );
+        let proposed = requests(
+            (&f.project, &ViewIndex::new(&f.project)),
+            (semantic.project(), semantic.index()),
+            f.diagram,
+            &scope.placements,
+            f.node,
+            args.0,
+            (args.1, args.2),
+        );
+        assert_eq!(proposed, vec![xy(320., 360.), xy(510., 270.)]);
+        assert_eq!(
+            proposed,
+            requests(
+                (&f.project, &ViewIndex::new(&f.project)),
+                (semantic.project(), semantic.index()),
+                f.diagram,
+                &scope.placements,
+                f.node,
+                args.0,
+                (args.1, args.2)
+            )
+        );
+    }
+
+    #[test]
+    fn no_crossing_no_overlap_no_source_and_nonfinite_requests_are_empty() {
+        let f = fixture(Layer::Oa);
+        let (scope, semantic) = semantic(&f);
+        for (requested, pointer) in [
+            (xy(170., 180.), Point::new(210., 210.)),
+            (xy(700., 180.), Point::new(740., 210.)),
+            (xy(f32::NAN, 180.), Point::new(99., 210.)),
+            (xy(89., 180.), Point::new(f32::INFINITY, 210.)),
+        ] {
+            assert!(
+                requests(
+                    (&f.project, &ViewIndex::new(&f.project)),
+                    (semantic.project(), semantic.index()),
+                    f.diagram,
+                    &scope.placements,
+                    f.node,
+                    requested,
+                    (Point::new(200., 210.), pointer)
+                )
+                .is_empty()
+            );
+        }
+        assert!(
+            requests(
+                (semantic.project(), semantic.index()),
+                (semantic.project(), semantic.index()),
+                f.diagram,
+                &scope.placements,
+                f.node,
+                xy(89., 180.),
+                (Point::new(200., 210.), Point::new(99., 210.))
+            )
+            .is_empty()
+        );
+    }
+
+    #[test]
+    fn descendant_footprint_controls_clearance_without_mutating_projects() {
+        for layer in [Layer::Oa, Layer::Sa] {
+            let mut f = fixture(layer);
+            let kind = f.project.elements[&f.work].kind();
+            let child = f
+                .project
+                .add_element(kind, layer, "Child", Some(f.work))
+                .unwrap();
+            let child_node = f.project.place(f.diagram, child, xy(240., 270.));
+            // First-child allocation transfer is normally performed by commands;
+            // this fixture expresses the resulting leaf allocation directly.
+            f.project.relations.clear();
+            let owner = f.project.diagrams[&f.diagram].nodes[&f.performer].element;
+            f.project.relate(
+                RelationKind::Allocation,
+                "Leaf responsibility",
+                owner,
+                child,
+            );
+            let (scope, semantic) = semantic(&f);
+            assert!(scope.placements.contains_key(&child_node));
+            let before = f.project.clone();
+            let candidate = semantic.project().clone();
+            let proposed = requests(
+                (&f.project, &ViewIndex::new(&f.project)),
+                (&candidate, semantic.index()),
+                f.diagram,
+                &scope.placements,
+                f.node,
+                xy(89., 180.),
+                (Point::new(170., 210.), Point::new(99., 210.)),
+            );
+            assert_eq!(proposed, vec![xy(-240., 180.)]);
+            let placed = plan::place(&semantic, proposed[0], presentation()).unwrap();
+            let root = &placed.diagram.nodes[&f.node];
+            let child = &placed.diagram.nodes[&child_node];
+            assert_eq!(child.position.x - root.position.x, 80.);
+            assert_eq!(child.position.y - root.position.y, 90.);
+            assert_eq!(f.project, before);
+            assert_eq!(semantic.project(), &candidate);
+        }
+    }
+
+    #[test]
+    fn independent_selected_roots_keep_one_rigid_group_translation() {
+        for layer in [Layer::Oa, Layer::Sa] {
+            let mut f = fixture(layer);
+            let kind = f.project.elements[&f.work].kind();
+            let second = f
+                .project
+                .add_element(kind, layer, "Second work", None)
+                .unwrap();
+            let second_node = f.project.place(f.diagram, second, xy(240., 300.));
+            let owner = f.project.diagrams[&f.diagram].nodes[&f.performer].element;
+            f.project.relate(
+                RelationKind::Allocation,
+                "Second responsibility",
+                owner,
+                second,
+            );
+            let selected = BTreeMap::from([(f.node, f.work), (second_node, second)]);
+            let scope =
+                plan::assignment::capture(&f.project, f.diagram, &selected, f.node).unwrap();
+            let semantic = plan::assignment::plan_semantics(
+                &scope,
+                plan::Destination::OutsidePerformers,
+                &BTreeMap::new(),
+            )
+            .unwrap();
+            let proposed = requests(
+                (&f.project, &ViewIndex::new(&f.project)),
+                (semantic.project(), semantic.index()),
+                f.diagram,
+                scope.affected(),
+                f.node,
+                xy(89., 180.),
+                (Point::new(170., 210.), Point::new(99., 210.)),
+            );
+            assert_eq!(proposed, vec![xy(-220., 180.)]);
+            let placed = plan::assignment::place(&semantic, proposed[0], presentation()).unwrap();
+            let root = &placed.diagram.nodes[&f.node];
+            let second = &placed.diagram.nodes[&second_node];
+            assert_eq!(second.position.x - root.position.x, 80.);
+            assert_eq!(second.position.y - root.position.y, 120.);
+            assert!(
+                plan::assignment::finish(&semantic, &f.project, &placed)
+                    .unwrap()
+                    .is_some()
+            );
+        }
+    }
+}

crates/oa-desktop/src/app/allocation_drag_full_tree_tests.rs

@@ -30,6 +30,117 @@ async fn mount() -> (Fixture, Mounted) {
     mounted.settle(&mut f.app).await;
     (f, mounted)
 }
+
+#[tokio::test]
+async fn actual_tree_outgoing_boundary_motion_preview_release_and_cancel() {
+    for layer in [Layer::Oa, Layer::Sa] {
+        let mut f = outgoing_fixture(layer);
+        f.app.layer = layer;
+        f.app.window_size = iced::Size::new(1440., 900.);
+        let _ = f.app.update(Message::Select(f.work));
+        let mut mounted = Mounted::new(&mut f.app).await;
+        f.app.zoom = 0.75;
+        f.app.pan = Vector::new(20., 15.);
+        f.app.fit_to_view = false;
+        mounted.settle(&mut f.app).await;
+        let original = f.app.project().clone();
+        let source = f.app.document.bundle().clone();
+        let from = at(&mut mounted, &f, xy(660., 225.));
+        mounted
+            .batch(
+                &mut f.app,
+                &[
+                    Input::Mouse(mouse::Event::CursorMoved { position: from }),
+                    Input::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)),
+                ],
+                mouse::Cursor::Available(from),
+            )
+            .await;
+        // Separate input/update/layout turns expose the held boundary transition
+        // that a one-batch distant drop cannot exercise.
+        for x in [620., 560., 510., 499., 490.] {
+            let to = at(&mut mounted, &f, xy(x, 225.));
+            mounted
+                .batch(
+                    &mut f.app,
+                    &[Input::Mouse(mouse::Event::CursorMoved { position: to })],
+                    mouse::Cursor::Available(to),
+                )
+                .await;
+            assert_eq!(f.app.project(), &original);
+            assert_eq!(f.app.document.bundle(), &source);
+            assert!(
+                !f.app.allocation_drag.feedback.as_ref().unwrap().refused,
+                "{layer:?} x={x}: {}",
+                f.app.status
+            );
+            assert!(f.app.allocation_drag.preview.is_some());
+            let _ = mounted.pixels(&f.app);
+        }
+        let expected = f
+            .app
+            .allocation_drag
+            .preview
+            .as_ref()
+            .unwrap()
+            .placement
+            .diagram
+            .clone();
+        let to = at(&mut mounted, &f, xy(490., 225.));
+        mounted
+            .batch(
+                &mut f.app,
+                &[Input::Mouse(mouse::Event::ButtonReleased(
+                    mouse::Button::Left,
+                ))],
+                mouse::Cursor::Available(to),
+            )
+            .await;
+        assert_eq!(&f.app.project().diagrams[&f.diagram], &expected);
+        assert!(
+            !f.app
+                .project()
+                .relations
+                .values()
+                .any(|r| r.kind() == RelationKind::Allocation && r.target() == f.work)
+        );
+        let _ = f.app.update(Message::Undo);
+        mounted.settle(&mut f.app).await;
+        assert_eq!(f.app.document.bundle(), &source);
+        let from = at(&mut mounted, &f, xy(660., 225.));
+        let to = at(&mut mounted, &f, xy(490., 225.));
+        mounted
+            .batch(
+                &mut f.app,
+                &[
+                    Input::Mouse(mouse::Event::CursorMoved { position: from }),
+                    Input::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)),
+                    Input::Mouse(mouse::Event::CursorMoved { position: to }),
+                ],
+                mouse::Cursor::Available(to),
+            )
+            .await;
+        mounted
+            .batch(
+                &mut f.app,
+                &[key(keyboard::key::Named::Escape)],
+                mouse::Cursor::Available(to),
+            )
+            .await;
+        mounted
+            .batch(
+                &mut f.app,
+                &[Input::Mouse(mouse::Event::ButtonReleased(
+                    mouse::Button::Left,
+                ))],
+                mouse::Cursor::Available(to),
+            )
+            .await;
+        assert_eq!(f.app.document.bundle(), &source);
+        assert!(f.app.allocation_drag.preview.is_none());
+        assert!(!f.app.document.can_undo());
+    }
+}
 fn canvas_bounds(mounted: &mut Mounted, app: &App) -> Rectangle {
     mounted
         .geometry(app)
@@ -481,6 +592,7 @@ async fn actual_app_tree_exact_incoming_drag_keeps_destination_visible_and_canva
             if pan.y == -100. {
                 // A genuine clipping refusal in the same held gesture, then
                 // recovery at the original exact point: no camera rebasing.
+                let retained = f.app.allocation_drag.preview.clone().unwrap();
                 let clipped = at(&mut mounted, &f, xy(160., 110.));
                 mounted
                     .batch(
@@ -492,7 +604,19 @@ async fn actual_app_tree_exact_incoming_drag_keeps_destination_visible_and_canva
                     )
                     .await;
                 assert!(f.app.allocation_drag.feedback.as_ref().unwrap().refused);
-                assert!(f.app.allocation_drag.preview.is_none());
+                assert!(Arc::ptr_eq(
+                    f.app.allocation_drag.preview.as_ref().unwrap(),
+                    &retained
+                ));
+                assert!(
+                    f.app
+                        .allocation_drag
+                        .feedback
+                        .as_ref()
+                        .unwrap()
+                        .ghost_delta
+                        .is_some()
+                );
                 assert_eq!(canvas_bounds(&mut mounted, &f.app), canvas);
                 assert_eq!(destination_bounds(&mut mounted, &f.app), slot);
                 assert_eq!(f.app.project(), &before);

crates/oa-desktop/src/app/allocation_drag_tests.rs

@@ -63,7 +63,6 @@ fn fixture(layer: Layer) -> Fixture {
 }
 fn canvas(app: &App) -> DiagramCanvas<'_> {
     DiagramCanvas {
-        removal_input: &app.saved_removal_input,
         selection: app.diagram_selection.as_ref(),
         allocation: Some(app.allocation_capability()),
         project: app.project(),
@@ -1240,6 +1239,7 @@ fn destination_identity_does_not_describe_blocked_or_outside_viewport_as_unalloc
         inspection_targets: vec![],
         text: "A card blocks this drop".into(),
         refused: true,
+        ghost_delta: None,
     };
     assert_eq!(feedback.destination_identity(), "No eligible destination");
     feedback.text = "Release inside the captured canvas".into();
@@ -1247,3 +1247,361 @@ fn destination_identity_does_not_describe_blocked_or_outside_viewport_as_unalloc
     feedback.refused = false;
     assert_eq!(feedback.destination_identity(), "Outside performers");
 }
+
+fn outgoing_fixture(layer: Layer) -> Fixture {
+    let mut f = fixture(layer);
+    drag(&mut f, screen(xy(160., 190.)));
+    let mut project = f.app.project().clone();
+    let d = project.diagrams.get_mut(&f.diagram).unwrap();
+    let performer = d.nodes.values_mut().find(|n| n.element == f.a).unwrap();
+    performer.position = xy(500., 100.);
+    performer.size = Size {
+        width: 300.,
+        height: 300.,
+    };
+    d.nodes.get_mut(&f.node).unwrap().position = xy(540., 190.);
+    replace(&mut f, project);
+    f
+}
+
+#[test]
+fn outgoing_boundary_drop_clears_source_without_changing_other_placements() {
+    for layer in [Layer::Oa, Layer::Sa] {
+        let mut f = outgoing_fixture(layer);
+        let before = f.app.project().clone();
+        let source = f.app.document.bundle().clone();
+        let from = screen(xy(660., 225.));
+        let to = screen(xy(490., 225.));
+        let mut events = batch(&f.app, from, to);
+        let release = events.pop().unwrap();
+        send(&mut f.app, events);
+        let feedback = f.app.allocation_drag.feedback.as_ref().unwrap();
+        assert!(!feedback.refused, "{}", feedback.text);
+        let preview = f.app.allocation_drag.preview.as_ref().unwrap();
+        let expected_diagram = preview.placement.diagram.clone();
+        let work = &expected_diagram.nodes[&f.node];
+        assert!(work.position.x + work.size.width <= 490.);
+        assert_eq!(work.position.y, 190.);
+        for (id, node) in &before.diagrams[&f.diagram].nodes {
+            if *id != f.node {
+                assert_eq!(&expected_diagram.nodes[id], node);
+            }
+        }
+        assert_eq!(f.app.project(), &before);
+        assert_eq!(f.app.document.bundle(), &source);
+        let _ = f.app.update(release);
+        assert_eq!(&f.app.project().diagrams[&f.diagram], &expected_diagram);
+        assert!(
+            !f.app
+                .project()
+                .relations
+                .values()
+                .any(|r| r.kind() == RelationKind::Allocation && r.target() == f.work)
+        );
+        let after = f.app.project().clone();
+        let saved = f.app.document.bundle().clone();
+        let _ = f.app.update(Message::Undo);
+        assert_eq!(f.app.project(), &before);
+        assert_eq!(f.app.document.bundle(), &source);
+        assert!(!f.app.document.can_undo());
+        let _ = f.app.update(Message::Redo);
+        assert_eq!(f.app.project(), &after);
+        assert_eq!(f.app.document.bundle(), &saved);
+    }
+}
+
+#[test]
+fn outgoing_clearance_collision_refuses_release_without_source_or_history_mutation() {
+    for layer in [Layer::Oa, Layer::Sa] {
+        let mut f = outgoing_fixture(layer);
+        let mut project = f.app.project().clone();
+        let obstacle = project
+            .add_element(
+                project.elements[&f.work].kind(),
+                layer,
+                "Unrelated work",
+                None,
+            )
+            .unwrap();
+        let obstacle_node = project.place(f.diagram, obstacle, xy(240., 190.));
+        replace(&mut f, project);
+        // A refused release must preserve an existing redo branch, too.
+        let _ = f.app.update(Message::Command(Command::Rename(
+            f.work,
+            "Temporary".into(),
+        )));
+        let _ = f.app.update(Message::Undo);
+        let before = f.app.project().clone();
+        let source = f.app.document.bundle().clone();
+        let snapshot = f.app.document.snapshot();
+        let revision = f.app.document.revision();
+        let from = screen(xy(660., 225.));
+        let to = screen(xy(490., 225.));
+        let mut events = batch(&f.app, from, to);
+        let release = events.pop().unwrap();
+        send(&mut f.app, events);
+
+        let active = f.app.allocation_drag.active.as_ref().unwrap();
+        let p = &active.press;
+        let frozen = active.frozen.as_ref().unwrap();
+        let owner = frozen.targets.iter().find(|t| t.element == f.a).unwrap();
+        assert_eq!(p.start, from);
+        assert!(contains(owner.region, p.stamp.world(from)));
+        assert!(p.stamp.world(to).x < owner.region.x);
+        assert_eq!(
+            frozen.resolve(p.stamp, Some(to), false),
+            Hit::Destination(plan::Destination::OutsidePerformers, None),
+            "The pointer must reach empty canvas, not be occluded by the obstacle"
+        );
+        let candidate = active
+            .cache
+            .iter()
+            .find(|(destination, _)| *destination == plan::Destination::OutsidePerformers)
+            .unwrap()
+            .1
+            .as_ref()
+            .unwrap();
+        let affected = match &active.prepared {
+            Prepared::Singleton(scope) => &scope.placements,
+            Prepared::Assignment(scope) => scope.affected(),
+            _ => panic!("expected assignment gesture"),
+        };
+        let requested = xy(370., 190.);
+        let presentation = plan::PresentationContext {
+            viewport: p.stamp.viewport(),
+            zoom: p.stamp.zoom,
+            target: None,
+        };
+        assert!(matches!(
+            candidate.place(requested, presentation),
+            Err(plan::Refusal::LayoutRequired(_))
+        ));
+        let proposed = clearance::requests(
+            (f.app.project(), f.app.document.view_index()),
+            (candidate.project(), candidate.index()),
+            f.diagram,
+            affected,
+            f.node,
+            requested,
+            (p.stamp.world(from), p.stamp.world(to)),
+        );
+        assert_eq!(
+            proposed.len(),
+            1,
+            "a genuine left crossing must propose clearance"
+        );
+        assert!(proposed[0].x < requested.x);
+        let work = &before.diagrams[&f.diagram].nodes[&f.node];
+        let obstacle = &before.diagrams[&f.diagram].nodes[&obstacle_node];
+        assert!(obstacle.position.x + obstacle.size.width < 490.);
+        assert!(proposed[0].x + work.size.width <= owner.region.x - 10.);
+        assert!(proposed[0].x < obstacle.position.x + obstacle.size.width);
+        assert!(obstacle.position.x < proposed[0].x + work.size.width);
+        assert_eq!(proposed[0].y, obstacle.position.y);
+        assert!(matches!(
+            candidate.place(proposed[0], presentation),
+            Err(plan::Refusal::LayoutRequired(message)) if message.contains("overlapping cards")
+        ));
+        let feedback = f.app.allocation_drag.feedback.as_ref().unwrap();
+        assert!(feedback.refused, "{}", feedback.text);
+        assert!(feedback.ghost_delta.is_some());
+        assert!(f.app.allocation_drag.preview.is_none());
+        assert_eq!(f.app.project(), &before);
+        assert_eq!(f.app.document.bundle(), &source);
+        assert!(Arc::ptr_eq(&snapshot, &f.app.document.snapshot()));
+        let _ = f.app.update(release);
+        assert!(
+            f.app.status.contains("overlapping cards"),
+            "{}",
+            f.app.status
+        );
+        assert!(f.app.allocation_drag.active.is_none());
+        assert!(f.app.allocation_drag.preview.is_none());
+        assert_eq!(f.app.project(), &before);
+        assert_eq!(f.app.document.bundle(), &source);
+        assert_eq!(f.app.document.revision(), revision);
+        assert!(Arc::ptr_eq(&snapshot, &f.app.document.snapshot()));
+        assert!(!f.app.document.can_undo());
+        assert!(f.app.document.can_redo());
+    }
+}
+
+#[test]
+fn outgoing_clearance_preserves_source_enclosure_and_allocated_sibling() {
+    for layer in [Layer::Oa, Layer::Sa] {
+        let mut f = outgoing_fixture(layer);
+        let mut project = f.app.project().clone();
+        let sibling = project
+            .add_element(
+                project.elements[&f.work].kind(),
+                layer,
+                "Remaining work",
+                None,
+            )
+            .unwrap();
+        let sibling_node = project.place(f.diagram, sibling, xy(540., 450.));
+        let allocation = project.relate(
+            RelationKind::Allocation,
+            "Keep responsibility",
+            f.a,
+            sibling,
+        );
+        replace(&mut f, project);
+        let before = f.app.project().clone();
+        let source = f.app.document.bundle().clone();
+        let view = projection::project_view(&before, f.diagram);
+        let owner = view.nodes.iter().find(|n| n.element == f.a).unwrap();
+        let bottom = owner.position.y + owner.size.height;
+        let stored_owner = &before.diagrams[&f.diagram].nodes[&owner.id];
+        assert!(
+            bottom > stored_owner.position.y + stored_owner.size.height,
+            "The retained sibling must enlarge the projected source enclosure"
+        );
+        let from = screen(xy(660., 225.));
+        let to = screen(xy(660., bottom + 1.));
+        let mut events = batch(&f.app, from, to);
+        let release = events.pop().unwrap();
+        send(&mut f.app, events);
+        let active = f.app.allocation_drag.active.as_ref().unwrap();
+        let p = &active.press;
+        let frozen = active.frozen.as_ref().unwrap();
+        let target = frozen.targets.iter().find(|t| t.element == f.a).unwrap();
+        assert_eq!(p.start, from);
+        assert!(contains(target.region, p.stamp.world(from)));
+        assert!(p.stamp.world(to).y >= target.region.y + target.region.height);
+        assert_eq!(
+            frozen.resolve(p.stamp, Some(to), false),
+            Hit::Destination(plan::Destination::OutsidePerformers, None)
+        );
+        let preview = f.app.allocation_drag.preview.as_ref().expect(&f.app.status);
+        assert!(!f.app.allocation_drag.feedback.as_ref().unwrap().refused);
+        let requested = xy(540., 190. + to.y - from.y);
+        assert!(matches!(
+            preview.candidate.place(
+                requested,
+                plan::PresentationContext {
+                    viewport: p.stamp.viewport(),
+                    zoom: p.stamp.zoom,
+                    target: None,
+                }
+            ),
+            Err(plan::Refusal::LayoutRequired(_))
+        ));
+        let moved = &preview.placement.diagram.nodes[&f.node];
+        assert_eq!(moved.position.x, 540.);
+        assert!(moved.position.y >= bottom + 10.);
+        assert!(moved.position.y > requested.y);
+        assert_eq!(
+            preview
+                .placement
+                .view
+                .nodes
+                .iter()
+                .find(|n| n.id == owner.id)
+                .unwrap(),
+            owner
+        );
+        let remaining = preview
+            .placement
+            .view
+            .nodes
+            .iter()
+            .find(|n| n.id == sibling_node)
+            .unwrap();
+        assert_eq!(remaining.visual_parent, Some(owner.id));
+        assert_eq!(
+            remaining.position,
+            before.diagrams[&f.diagram].nodes[&sibling_node].position
+        );
+        assert_eq!(
+            &preview.project().relations[&allocation],
+            &before.relations[&allocation]
+        );
+        for (id, node) in &before.diagrams[&f.diagram].nodes {
+            if *id != f.node {
+                assert_eq!(&preview.placement.diagram.nodes[id], node);
+            }
+        }
+        let mut expected = preview.project().clone();
+        expected
+            .diagrams
+            .insert(f.diagram, preview.placement.diagram.clone());
+        assert_eq!(f.app.project(), &before);
+        assert_eq!(f.app.document.bundle(), &source);
+        let _ = f.app.update(release);
+        assert_eq!(f.app.project(), &expected, "{}", f.app.status);
+        assert_eq!(f.app.document.revision(), 1);
+        assert_eq!(
+            validation::effective_performer(f.app.project(), f.work),
+            None
+        );
+        assert_eq!(
+            validation::effective_performer(f.app.project(), sibling),
+            Some(f.a)
+        );
+        assert_eq!(
+            &f.app.project().relations[&allocation],
+            &before.relations[&allocation]
+        );
+        let after = f.app.document.bundle().clone();
+        let _ = f.app.update(Message::Undo);
+        assert_eq!(f.app.project(), &before);
+        assert_eq!(f.app.document.bundle(), &source);
+        assert!(!f.app.document.can_undo());
+        let _ = f.app.update(Message::Redo);
+        assert_eq!(f.app.project(), &expected);
+        assert_eq!(f.app.document.bundle(), &after);
+    }
+}
+
+#[test]
+fn refused_motion_retains_last_scene_but_release_never_commits_it() {
+    let mut f = outgoing_fixture(Layer::Sa);
+    let mut project = f.app.project().clone();
+    let obstacle = project
+        .add_element(Kind::Function, Layer::Sa, "Unrelated work", None)
+        .unwrap();
+    project.place(f.diagram, obstacle, xy(1250., 120.));
+    replace(&mut f, project);
+    let original = f.app.project().clone();
+    let source = f.app.document.bundle().clone();
+    let p = admit_press(&mut f);
+    let clear = screen(xy(450., 225.));
+    let _ = f.app.update(Message::WorkDrag(Event::Preview(
+        p.stamp,
+        p.token,
+        Some(clear),
+    )));
+    let last = f.app.allocation_drag.preview.clone().expect(&f.app.status);
+    // Another work card blocks this location: the prior legal outgoing scene is display
+    // state only, and must not become a fallback command on release.
+    let blocked = screen(xy(1260., 130.));
+    let _ = f.app.update(Message::WorkDrag(Event::Preview(
+        p.stamp,
+        p.token,
+        Some(blocked),
+    )));
+    assert!(f.app.allocation_drag.feedback.as_ref().unwrap().refused);
+    assert!(
+        f.app
+            .allocation_drag
+            .feedback
+            .as_ref()
+            .unwrap()
+            .ghost_delta
+            .is_some()
+    );
+    assert!(Arc::ptr_eq(
+        f.app.allocation_drag.preview.as_ref().unwrap(),
+        &last
+    ));
+    let _ = f.app.update(Message::WorkDrag(Event::Release(
+        p.stamp,
+        p.token,
+        Some(blocked),
+    )));
+    assert_eq!(f.app.project(), &original);
+    assert_eq!(f.app.document.bundle(), &source);
+    assert!(!f.app.document.can_undo());
+    assert!(f.app.allocation_drag.preview.is_none());
+}

crates/oa-desktop/src/app/architecture_authoring/tests.rs

@@ -67,7 +67,6 @@ fn architecture_f2_routes_selected_node_to_inline_rename_and_exact_undo() {
     let camera = (app.zoom, app.pan);
     let bounds = iced::Rectangle::new(iced::Point::ORIGIN, iced::Size::new(600., 380.));
     let canvas = crate::diagram::DiagramCanvas {
-        removal_input: &app.saved_removal_input,
         selection: None,
         project: app.project(),
         view_index: None,

crates/oa-desktop/src/app/architecture_authoring_tests.rs

@@ -221,7 +221,6 @@ fn architecture_canvas_left_click_uses_world_coordinate_once_at_zoom_and_pan() {
         y: (local.y - app.pan.y) / app.zoom,
     };
     let canvas = crate::diagram::DiagramCanvas {
-        removal_input: &app.saved_removal_input,
         selection: None,
         project: app.project(),
         view_index: None,
@@ -300,7 +299,6 @@ fn architecture_f2_rename_preserves_identity_placement_and_atomic_history() {
     let diagrams = app.project().diagrams.clone();
     let camera = (app.zoom, app.pan);
     let canvas = crate::diagram::DiagramCanvas {
-        removal_input: &app.saved_removal_input,
         selection: None,
         project: app.project(),
         view_index: None,

crates/oa-desktop/src/app/behavior_removal_tests.rs

@@ -179,7 +179,7 @@ async fn mounted_scenario_use_delete_keeps_definition_and_second_use_and_rejects
     let token = delete(&mut mounted, &mut app, true).await;
     send(&mut mounted, &mut app, Message::ConfirmDelete(stale)).await;
     assert!(app.delete_pending, "old token does not cancel new dialog");
-    // Keep selection and epoch unchanged while moving to another Scenario owner.
+    // Keep selection and epoch deliberately unchanged: owner is an independent witness.
     let captured = app.scenario_context().unwrap();
     assert_eq!(captured.scenario, owners[0]);
     assert_eq!(
@@ -197,28 +197,9 @@ async fn mounted_scenario_use_delete_keeps_definition_and_second_use_and_rejects
     assert_eq!(other.epoch, captured.epoch);
     assert_eq!(app.selected, uses[0]);
     assert!(
-        !app.delete_target.as_ref().unwrap().snapshot.valid(&app),
-        "the real captured snapshot rejects the changed Scenario destination"
+        app.delete_target.as_ref().unwrap().snapshot.valid(&app),
+        "the independent owner guard must reject an otherwise current token"
     );
-    // Isolate the independent behavior-owner predicate: a current, unqualified
-    // object request has no old Scenario envelope or destination to reject it.
-    // This test-only replacement does not refresh the captured behavior owner.
-    let otherwise_current = crate::model_menu::Opened::new(
-        &app,
-        crate::model_menu::Request::object(uses[0], Point::ORIGIN),
-        token,
-    )
-    .unwrap();
-    assert!(otherwise_current.valid(&app));
-    let target = app.delete_target.as_ref().unwrap();
-    assert_eq!(target.selection, app.selected);
-    assert_eq!(target.placement, None);
-    assert_eq!(app.selected_node, None);
-    assert_eq!(target.behavior_owner, Some(owners[0]));
-    assert_eq!(diagram_removal::behavior_owner(&app), Some(owners[1]));
-    assert!(app.delete_pending);
-    assert!(!app.behavior.has_pending() && !app.source_dirty() && !app.draft_dirty());
-    app.delete_target.as_mut().unwrap().snapshot = otherwise_current;
     send(&mut mounted, &mut app, Message::ConfirmDelete(token)).await;
     assert_eq!(app.document.bundle(), &original);
     assert!(!app.delete_pending && app.delete_target.is_none());

crates/oa-desktop/src/app/diagram_removal.rs

@@ -15,9 +15,6 @@ pub struct Confirmation {
     pub selection: Id,
     pub placement: Option<Id>,
     pub behavior_owner: Option<Id>,
-    pub(crate) scenario: Option<super::scenario_removal::Review>,
-    pub(crate) process: Option<super::process_removal::Review>,
-    pub(crate) saved: Option<super::saved_removal::Review>,
 }
 
 pub fn enabled(app: &App) -> bool {
@@ -212,9 +209,6 @@ impl App {
                     selection: self.selected,
                     placement: placement(self),
                     behavior_owner: behavior_owner(self),
-                    scenario: None,
-                    process: None,
-                    saved: None,
                 }
             });
         self.delete_pending = self.delete_target.is_some();

crates/oa-desktop/src/app/escape.rs

@@ -1,4 +1,4 @@
-//! Keep overlay ownership ahead of cancellation and captured reorder Apply.
+//! Keep overlay Escape ahead of modal cancellation in the ordinary widget tree.
 //!
 //! Iced skips root.update when an overlay captures an event. Keeping this
 //! wrapper present even when inactive preserves the child's widget state. A
@@ -24,34 +24,9 @@ pub(crate) fn root<'a, R: renderer::Renderer + 'a>(
                 && app.architecture.is_none()));
     Element::new(Bridge {
         content,
-        removal_cancel: app
-            .delete_target
-            .as_ref()
-            .filter(|target| {
-                app.delete_pending && (target.process.is_some() || target.saved.is_some())
-            })
-            .map(|target| {
-                if target.saved.is_some() {
-                    return Message::SavedRemoval(Box::new(super::saved_removal::Event::Cancel {
-                        token: target.snapshot.token,
-                    }));
-                }
-                Message::ProcessRemoval(Box::new(super::process_removal::Event::Cancel {
-                    token: target.snapshot.token,
-                }))
-            }),
-        reorder_active: app.scenario_reorder_enabled() && app.scenario_reorder.session.is_some(),
-        reorder_apply: crate::behavior::scenario::reorder_view::apply_message(app),
         messages: [
             architecture_authoring::captured_escape_message(app),
-            modal.then_some(Message::Escape).or_else(|| {
-                app.scenario_reorder.session.as_ref().map(|session| {
-                    crate::behavior::scenario::reorder_view::message(
-                        session,
-                        super::scenario_reorder::Intent::Cancel,
-                    )
-                })
-            }),
+            modal.then_some(Message::Escape),
         ],
     })
 }
@@ -59,9 +34,6 @@ pub(crate) fn root<'a, R: renderer::Renderer + 'a>(
 struct Bridge<'a, R> {
     content: Element<'a, Message, Theme, R>,
     messages: [Option<Message>; 2],
-    removal_cancel: Option<Message>,
-    reorder_active: bool,
-    reorder_apply: Option<Message>,
 }
 
 impl<R: renderer::Renderer> Widget<Message, Theme, R> for Bridge<'_, R> {
@@ -115,43 +87,6 @@ impl<R: renderer::Renderer> Widget<Message, Theme, R> for Bridge<'_, R> {
         shell: &mut Shell<'_, Message>,
         viewport: &Rectangle,
     ) {
-        if self.reorder_active
-            && matches!(event,
-            Event::Keyboard(keyboard::Event::KeyPressed { key: keyboard::Key::Named(keyboard::key::Named::Enter), modifiers, .. })
-                if modifiers.control() && !modifiers.alt() && !modifiers.shift() && !modifiers.logo())
-        {
-            // A picker may have opened earlier in this same input batch, before
-            // App state can invalidate the captured reorder action.
-            if let Some(element) = self.content.as_widget_mut().overlay(
-                &mut tree.children[0],
-                layout,
-                renderer,
-                viewport,
-                Vector::ZERO,
-            ) {
-                let mut current = overlay::Nested::new(element);
-                let node = current.layout(renderer, viewport.size());
-                current.update(
-                    event,
-                    Layout::new(&node),
-                    cursor,
-                    renderer,
-                    clipboard,
-                    shell,
-                );
-                shell.capture_event();
-                return;
-            }
-            if matches!(
-                event,
-                Event::Keyboard(keyboard::Event::KeyPressed { repeat: false, .. })
-            ) && let Some(message) = &self.reorder_apply
-            {
-                shell.publish(message.clone());
-            }
-            shell.capture_event();
-            return;
-        }
         let escape = matches!(
             event,
             Event::Keyboard(keyboard::Event::KeyPressed {
@@ -164,11 +99,6 @@ impl<R: renderer::Renderer> Widget<Message, Theme, R> for Bridge<'_, R> {
         // Escape would otherwise reach focused fields underneath it. Offer only
         // Escape to the current overlay before updating the ordinary tree.
         if escape {
-            if let Some(cancel) = &self.removal_cancel {
-                shell.publish(cancel.clone());
-                shell.capture_event();
-                return;
-            }
             if let Some(element) = self.content.as_widget_mut().overlay(
                 &mut tree.children[0],
                 layout,
@@ -190,13 +120,6 @@ impl<R: renderer::Renderer> Widget<Message, Theme, R> for Bridge<'_, R> {
             if shell.is_event_captured() {
                 return;
             }
-            if self.reorder_active
-                && let Some(cancel) = &self.messages[1]
-            {
-                shell.publish(cancel.clone());
-                shell.capture_event();
-                return;
-            }
         }
         self.content.as_widget_mut().update(
             &mut tree.children[0],

crates/oa-desktop/src/app/multiselect.rs

@@ -100,7 +100,6 @@ impl App {
             (self.page == Page::Behavior).then_some(self.behavior.diagram.placement),
             self.topology_context(),
             self.behavior.topology.selection_address(),
-            self.scenario_context(),
         )
     }
     pub(crate) fn multiselect_context(&self) -> Option<Context> {
@@ -110,9 +109,6 @@ impl App {
                 if let Some(current) = self.topology_context() {
                     return Some(process_context(current));
                 }
-                if let Some(current) = self.scenario_context() {
-                    return Some(crate::behavior::scenario::selection::context(current));
-                }
                 let current = self.state_context()?;
                 crate::behavior::state_edit::validate_context(self.project(), current, current)
                     .ok()?;
@@ -123,14 +119,6 @@ impl App {
     }
 
     pub(crate) fn multiselect_target_visible(&self, target: &Target) -> bool {
-        if let Some(context) = self.scenario_context() {
-            return crate::behavior::scenario::selection::visible(
-                self.project(),
-                context,
-                self.selected,
-            )
-            .contains(target);
-        }
         if let Some(context) = self.topology_context() {
             return self
                 .behavior
@@ -164,10 +152,6 @@ impl App {
     }
 
     pub(crate) fn multiselect_envelope(&self, event: &Event) -> bool {
-        // Scenario input additionally needs its representation and visit.
-        if self.scenario_context().is_some() {
-            return false;
-        }
         let Some(current) = self.multiselect_context() else {
             return false;
         };
@@ -235,10 +219,6 @@ impl App {
     }
 
     pub(crate) fn reconcile_multiselect(&mut self) {
-        if self.scenario_context().is_some() {
-            self.reconcile_scenario_multiselect();
-            return;
-        }
         if self.topology_context().is_some() {
             self.reconcile_process_multiselect();
             return;
@@ -304,10 +284,6 @@ impl App {
     }
 
     pub(super) fn inspect_multiselect_primary(&mut self) {
-        if self.scenario_context().is_some() {
-            self.inspect_scenario_multiselect_primary();
-            return;
-        }
         if self.topology_context().is_some() {
             self.inspect_process_multiselect_primary();
             return;

crates/oa-desktop/src/app/process_removal.rs

@@ -1,230 +0,0 @@
-//! One captured Process selection, one impact review, one document transaction.
-use super::multiselect::process_context;
-use super::*;
-use crate::behavior::topology::{self, group_removal};
-use crate::diagram_selection::Snapshot;
-use crate::diagram_usage::Target;
-use crate::model_menu;
-
-#[cfg(test)]
-mod tests;
-pub(crate) mod view;
-
-#[derive(Debug, Clone)]
-pub(crate) enum Event {
-    Begin {
-        input_generation: u64,
-        context: topology::Context,
-        snapshot: Box<Snapshot>,
-    },
-    Query {
-        token: u64,
-        query: String,
-    },
-    Page {
-        token: u64,
-        page: usize,
-    },
-    Cancel {
-        token: u64,
-    },
-}
-
-pub(crate) struct Review {
-    input_generation: u64,
-    pub(crate) context: topology::Context,
-    pub(crate) snapshot: Snapshot,
-    pub(crate) plan: group_removal::Plan,
-    pub(crate) query: String,
-    pub(crate) page: usize,
-}
-
-pub(crate) fn begin(app: &App) -> Option<Message> {
-    let input_generation = app.behavior.topology.removal_generation()?;
-    let context = app.topology_context()?;
-    let snapshot = app.multiselect_snapshot()?;
-    (snapshot.targets().len() > 1).then_some(Message::ProcessRemoval(Box::new(Event::Begin {
-        input_generation,
-        context,
-        snapshot: Box::new(snapshot),
-    })))
-}
-
-impl App {
-    pub(crate) fn process_removal_enabled(&self) -> bool {
-        diagram_removal::enabled(self)
-            && !self.source_rename.open()
-            && self.behavior.topology.selecting()
-            && self.behavior.topology.removal_generation().is_some()
-            && self.topology_context().is_some()
-    }
-
-    fn process_removal_matches(&self, context: topology::Context, snapshot: &Snapshot) -> bool {
-        if self.topology_context() != Some(context)
-            || !self
-                .diagram_selection
-                .as_ref()
-                .is_some_and(|selected| selected.matches(snapshot, process_context(context)))
-        {
-            return false;
-        }
-        let visible = self
-            .behavior
-            .topology
-            .selection_targets(self.project(), context.owner);
-        snapshot
-            .targets()
-            .iter()
-            .all(|target| visible.contains(target))
-    }
-
-    pub(super) fn process_removal_event(&mut self, event: Event) -> Task<Message> {
-        match event {
-            Event::Begin {
-                input_generation,
-                context,
-                snapshot,
-            } => {
-                // Admission precedes every shared input/selection boundary. A
-                // stale packet must not prune the set or retire a newer editor.
-                if self.behavior.topology.removal_generation() != Some(input_generation)
-                    || !self.process_removal_matches(context, &snapshot)
-                    || !self.process_removal_enabled()
-                    || snapshot.targets().len() < 2
-                {
-                    return Task::none();
-                }
-                let plan =
-                    match group_removal::prepare(self.project(), context.owner, snapshot.targets())
-                    {
-                        Ok(plan) => plan,
-                        Err(reason) => {
-                            self.status = reason;
-                            return Task::none();
-                        }
-                    };
-                let Some(primary_target) = snapshot.primary().cloned() else {
-                    return Task::none();
-                };
-                let primary = match &primary_target {
-                    Target::ProcessOccurrence(endpoint) => endpoint.occurrence,
-                    Target::ProcessLink(id) => *id,
-                    _ => return Task::none(),
-                };
-                self.source_interaction();
-                self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-                let context = self.topology_context().expect("admitted Process");
-                let snapshot = self.multiselect_snapshot().expect("admitted selection");
-                let mut request = model_menu::Request::object(primary, iced::Point::ORIGIN);
-                request.process = Some(Box::new(context));
-                request.selection_target = Some(Box::new(primary_target));
-                self.menu_sequence = self.menu_sequence.wrapping_add(1);
-                self.delete_target = model_menu::Opened::new(self, request, self.menu_sequence)
-                    .map(|opened| diagram_removal::Confirmation {
-                        snapshot: opened,
-                        selection: self.selected,
-                        placement: None,
-                        behavior_owner: Some(context.owner),
-                        scenario: None,
-                        saved: None,
-                        process: Some(Review {
-                            input_generation,
-                            context,
-                            snapshot,
-                            plan,
-                            query: String::new(),
-                            page: 0,
-                        }),
-                    });
-                self.delete_pending = self.delete_target.is_some();
-            }
-            Event::Query { token, query } => {
-                if let Some(target) = self
-                    .delete_target
-                    .as_mut()
-                    .filter(|target| target.snapshot.token == token)
-                    && let Some(review) = target.process.as_mut()
-                {
-                    review.query = query;
-                    review.page = 0;
-                }
-            }
-            Event::Page { token, page } => {
-                if let Some(target) = self
-                    .delete_target
-                    .as_mut()
-                    .filter(|target| target.snapshot.token == token)
-                    && let Some(review) = target.process.as_mut()
-                {
-                    review.page = page;
-                }
-            }
-            Event::Cancel { token } => {
-                if self.delete_target.as_ref().is_some_and(|target| {
-                    target.snapshot.token == token && target.process.is_some()
-                }) {
-                    self.delete_target = None;
-                    self.delete_pending = false;
-                    self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-                    self.status = "Removal cancelled. Model and selection unchanged.".into();
-                }
-            }
-        }
-        Task::none()
-    }
-
-    pub(crate) fn process_removal_review_valid(
-        &self,
-        target: &diagram_removal::Confirmation,
-    ) -> bool {
-        let Some(review) = &target.process else {
-            return false;
-        };
-        self.delete_pending
-            && !self.busy
-            && target.snapshot.valid(self)
-            && self.behavior.topology.removal_generation() == Some(review.input_generation)
-            && self.process_removal_matches(review.context, &review.snapshot)
-            && self.selected == target.selection
-            && !self.source_dirty()
-            && !self.draft_dirty()
-            && !self.behavior.has_pending()
-            && !self.source_rename.open()
-            && self.behavior.topology.selecting()
-    }
-
-    pub(super) fn confirm_process_removal(&mut self, token: u64) {
-        let Some(target) = self
-            .delete_target
-            .as_ref()
-            .filter(|target| target.snapshot.token == token && target.process.is_some())
-        else {
-            return;
-        };
-        let valid = self.process_removal_review_valid(target);
-        let target = self.delete_target.take().expect("captured review");
-        self.delete_pending = false;
-        self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-        if !valid {
-            self.status =
-                "Removal review expired. Nothing was removed; review the current selection again."
-                    .into();
-            return;
-        }
-        let review = target.process.expect("Process review");
-        match self.document.execute(review.plan.command) {
-            Ok(_) => {
-                self.selected = review.context.owner;
-                self.selected_node = None;
-                self.behavior.active_owner = Some(review.context.owner);
-                self.sync();
-                self.reconcile_multiselect();
-                self.status = format!(
-                    "Removed {} selected Process contributions or links in one change. Referenced definitions preserved. Undo restores the model.",
-                    review.snapshot.targets().len()
-                );
-            }
-            Err(error) => self.status = format!("Nothing removed: {error}"),
-        }
-    }
-}

crates/oa-desktop/src/app/process_removal/tests.rs

@@ -1,646 +0,0 @@
-use super::*;
-use crate::behavior::topology::{CanvasEvent, CanvasTool, direct_tests};
-use oa_core::source_project::SourceBundle;
-
-fn local(id: Id) -> Target {
-    Target::ProcessOccurrence(OccurrenceEndpoint {
-        references: vec![],
-        occurrence: id,
-    })
-}
-fn choose(app: &mut App, target: Target, choice: multiselect::Choice) {
-    let context = app.multiselect_context().unwrap();
-    let _ = app.update(Message::DiagramSelection(multiselect::Event::Choose(
-        context, target, choice,
-    )));
-}
-fn open_project(project: Project, owner: Id) -> App {
-    let mut app = App::with_project(project);
-    let _ = app.update(Message::Select(owner));
-    let _ = app.update(Message::Page(Page::Behavior));
-    app.reconcile_multiselect();
-    app.window_size = iced::Size::new(1600., 1000.);
-    app
-}
-fn fixture(layer: Layer) -> (App, direct_tests::Fixture) {
-    let f = direct_tests::fixture(layer);
-    let mut app = open_project(f.p.clone(), f.owner);
-    choose(
-        &mut app,
-        Target::ProcessLink(f.link),
-        multiselect::Choice::Replace,
-    );
-    choose(&mut app, local(f.nodes[0]), multiselect::Choice::Add);
-    assert!(app.process_removal_enabled());
-    assert_eq!(app.multiselect_snapshot().unwrap().targets().len(), 2);
-    (app, f)
-}
-fn send(app: &mut App, event: Event) {
-    let _ = app.update(Message::ProcessRemoval(Box::new(event)));
-}
-fn open(app: &mut App) -> u64 {
-    let message = begin(app).unwrap();
-    let _ = app.update(message);
-    let target = app.delete_target.as_ref().expect("aggregate review");
-    assert!(app.process_removal_review_valid(target));
-    target.snapshot.token
-}
-fn native_bundle(source: &str) -> SourceBundle {
-    SourceBundle {
-        entry: "project.arcadia".into(),
-        files: [("project.arcadia".into(), source.into())]
-            .into_iter()
-            .collect(),
-    }
-}
-const BASELINE: &str = include_str!(concat!(
-    env!("CARGO_MANIFEST_DIR"),
-    "/../../harness/fixtures/process-removal-baseline-20260925.arcadia"
-));
-const REMOVED: &str = include_str!(concat!(
-    env!("CARGO_MANIFEST_DIR"),
-    // V1 assumed canonical whitespace. V2 independently retains removed-token
-    // trivia and existing reference spelling under language section 7's rules.
-    "/../../harness/fixtures/process-removal-removed-v2-20260925.arcadia"
-));
-fn native() -> App {
-    let document = Document::from_bundle(native_bundle(BASELINE), Default::default()).unwrap();
-    let owner = alias(document.project(), "assessment");
-    let mut app = open_project(document.project().clone(), owner);
-    app.document = document;
-    // Replace the generated split workspace just as open_source_project does.
-    // sync preserves discovered files and is not a new-document initializer.
-    app.source_workspace = Workspace::new(app.document.bundle(), true);
-    app.sync();
-    app.reconcile_multiselect();
-    assert_eq!(app.source_workspace.bundle(), native_bundle(BASELINE));
-    app
-}
-fn alias(project: &Project, name: &str) -> Id {
-    project
-        .identities()
-        .into_iter()
-        .find(|(_, alias)| *alias == name)
-        .unwrap()
-        .0
-}
-
-#[test]
-fn process_group_removal_literal_native_model_and_source_oracle_undoes_once() {
-    let mut app = native();
-    for (index, name) in ["a", "c", "approved"].iter().enumerate() {
-        let id = alias(app.project(), name);
-        let target = if *name == "approved" {
-            Target::ProcessLink(id)
-        } else {
-            local(id)
-        };
-        choose(
-            &mut app,
-            target,
-            if index == 0 {
-                multiselect::Choice::Replace
-            } else {
-                multiselect::Choice::Add
-            },
-        );
-    }
-    let before = app.document.snapshot();
-    let selected = app.multiselect_snapshot().unwrap();
-    let camera = app.behavior.topology.camera_boundary();
-    let token = open(&mut app);
-    let review = app
-        .delete_target
-        .as_ref()
-        .unwrap()
-        .process
-        .as_ref()
-        .unwrap();
-    assert_eq!(review.snapshot.targets(), selected.targets());
-    assert_eq!(review.snapshot.primary(), selected.primary());
-    let rows = view::matching_rows(app.project(), review);
-    assert!(
-        rows.iter().any(|row| row.label.contains("@caller")
-            && row.disposition.contains("Uses changed definition"))
-    );
-    assert!(
-        rows.iter().any(|row| row.label.contains("@outer")
-            && row.disposition.contains("Uses changed definition"))
-    );
-    assert!(rows.iter().any(|row| {
-        row.label
-            .contains("Implicit listed order; 1 adjacent ordered pairs")
-            && row.disposition.starts_with("After")
-    }));
-    assert_eq!(app.document.bundle(), &before.bundle);
-    let expected = Document::from_bundle(native_bundle(REMOVED), Default::default()).unwrap();
-    let _ = app.update(Message::ConfirmDelete(token));
-    assert_eq!(app.project(), expected.project());
-    assert_eq!(
-        app.document.bundle(),
-        expected.bundle(),
-        "literal independently authored source oracle"
-    );
-    assert_eq!(app.source_workspace.bundle(), *expected.bundle());
-    assert_eq!(app.selected, alias(app.project(), "assessment"));
-    assert!(app.multiselect_snapshot().unwrap().targets().is_empty());
-    assert!(app.behavior.topology.camera_boundary() == camera);
-    let removed = app.document.bundle().clone();
-    let _ = app.update(Message::Undo);
-    assert_eq!(app.project(), &before.decoded.project);
-    assert_eq!(app.document.bundle(), &before.bundle);
-    assert!(!app.document.can_undo());
-    let _ = app.update(Message::Redo);
-    assert_eq!(app.document.bundle(), &removed);
-}
-
-#[test]
-fn process_group_removal_mixed_card_link_is_one_exact_transaction_in_both_layers() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let (mut app, f) = fixture(layer);
-        let before = app.document.snapshot();
-        let token = open(&mut app);
-        let review = app
-            .delete_target
-            .as_ref()
-            .unwrap()
-            .process
-            .as_ref()
-            .unwrap();
-        assert_eq!(
-            review.plan.removed,
-            [f.nodes[0], f.link].into_iter().collect()
-        );
-        let _ = app.update(Message::ConfirmDelete(token));
-        let mut expected = f.p.clone();
-        expected.elements.remove(&f.nodes[0]);
-        expected.relations.remove(&f.link);
-        *expected
-            .elements
-            .get_mut(&f.owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap() = vec![f.nodes[1], f.nodes[2]];
-        assert_eq!(app.project(), &expected);
-        for id in f.work.into_iter().chain([f.exchange]) {
-            assert!(app.project().contains(id));
-        }
-        let removed = app.document.bundle().clone();
-        assert_eq!(
-            Document::from_bundle(removed.clone(), Default::default())
-                .unwrap()
-                .project(),
-            &expected
-        );
-        let _ = app.update(Message::Undo);
-        assert_eq!(app.project(), &before.decoded.project);
-        assert_eq!(app.document.bundle(), &before.bundle);
-        assert!(!app.document.can_undo());
-        let _ = app.update(Message::Redo);
-        assert_eq!(app.document.bundle(), &removed);
-    }
-}
-
-#[test]
-fn process_group_removal_cancel_stale_packets_and_failed_commit_preserve_redo_source_and_selection()
-{
-    for failure in [false, true] {
-        let (mut app, f) = fixture(Layer::Oa);
-        app.document
-            .execute(Command::Rename(f.nodes[2], "Future name".into()))
-            .unwrap();
-        let future = app.document.bundle().clone();
-        assert!(app.document.undo());
-        app.sync();
-        app.reconcile_multiselect();
-        let baseline = app.document.snapshot();
-        let source = app.source_editor.text();
-        let selected = app.multiselect_snapshot().unwrap();
-        let camera = app.behavior.topology.camera_boundary();
-        let old_begin = begin(&app).unwrap();
-        let first = open(&mut app);
-        send(&mut app, Event::Cancel { token: first });
-        let second = open(&mut app);
-        let epoch = app.canvas_epoch;
-        for message in [
-            old_begin,
-            Message::ConfirmDelete(first),
-            Message::CancelDelete,
-            Message::Escape,
-            Message::ProcessRemoval(Box::new(Event::Cancel { token: first })),
-            Message::ProcessRemoval(Box::new(Event::Query {
-                token: first,
-                query: "stale".into(),
-            })),
-            Message::ProcessRemoval(Box::new(Event::Page {
-                token: first,
-                page: 90,
-            })),
-        ] {
-            let _ = app.update(message);
-            assert_eq!(app.delete_target.as_ref().unwrap().snapshot.token, second);
-            assert_eq!(app.canvas_epoch, epoch);
-        }
-        if failure {
-            // Force a genuine atomic engine failure after the admitted deletion.
-            // Neither the successful first candidate command nor history leaks.
-            let review = app
-                .delete_target
-                .as_mut()
-                .unwrap()
-                .process
-                .as_mut()
-                .unwrap();
-            review.plan.command = Command::Batch(vec![
-                Command::Delete(f.nodes[0]),
-                Command::Delete(Id::new_v4()),
-            ]);
-            let _ = app.update(Message::ConfirmDelete(second));
-            assert!(app.status.starts_with("Nothing removed:"));
-        } else {
-            send(&mut app, Event::Cancel { token: second });
-        }
-        assert!(std::sync::Arc::ptr_eq(&baseline, &app.document.snapshot()));
-        assert_eq!(app.project(), &baseline.decoded.project);
-        assert_eq!(app.document.bundle(), &baseline.bundle);
-        assert_eq!(app.source_editor.text(), source);
-        assert_eq!(app.source_workspace.bundle(), baseline.bundle);
-        assert_eq!(
-            app.multiselect_snapshot().unwrap().targets(),
-            selected.targets()
-        );
-        assert_eq!(
-            app.multiselect_snapshot().unwrap().primary(),
-            selected.primary()
-        );
-        assert!(app.behavior.topology.camera_boundary() == camera);
-        assert!(app.document.can_redo() && !app.document.can_undo());
-        let _ = app.update(Message::Redo);
-        assert_eq!(app.document.bundle(), &future);
-    }
-}
-
-#[test]
-fn process_group_removal_stale_secondary_and_context_are_rejected_before_any_boundary() {
-    for change in 0..4 {
-        let (mut app, f) = fixture(Layer::Sa);
-        let message = begin(&app).unwrap();
-        match change {
-            0 => {
-                app.diagram_selection
-                    .as_mut()
-                    .unwrap()
-                    .remove(&Target::ProcessLink(f.link));
-            }
-            1 => {
-                app.canvas_document = Id::new_v4();
-            }
-            2 => {
-                app.canvas_epoch = app.canvas_epoch.wrapping_add(1);
-            }
-            _ => {
-                app.document
-                    .execute(Command::Rename(f.nodes[2], "New revision".into()))
-                    .unwrap();
-            }
-        }
-        let source = app.document.bundle().clone();
-        let selected = app.multiselect_snapshot();
-        let epoch = app.canvas_epoch;
-        let _ = app.update(message);
-        assert!(app.delete_target.is_none());
-        assert_eq!(app.canvas_epoch, epoch);
-        assert_eq!(app.multiselect_snapshot(), selected);
-        assert_eq!(app.document.bundle(), &source);
-    }
-    let (mut app, f) = fixture(Layer::Oa);
-    let token = open(&mut app);
-    app.diagram_selection
-        .as_mut()
-        .unwrap()
-        .remove(&Target::ProcessLink(f.link));
-    let current = app.document.snapshot();
-    let _ = app.update(Message::ConfirmDelete(token));
-    assert!(app.status.contains("expired"));
-    assert!(std::sync::Arc::ptr_eq(&current, &app.document.snapshot()));
-}
-
-#[test]
-fn process_group_removal_pending_inputs_and_legacy_singleton_messages_preserve_all_members() {
-    for pending in ["clean", "properties", "source", "tool", "busy", "form"] {
-        let (mut app, f) = fixture(Layer::Oa);
-        match pending {
-            "properties" => {
-                let _ = app.update(Message::Field("/name".into(), "Unapplied".into()));
-            }
-            "source" => {
-                let text = format!("{}\n// pending", app.source_workspace.text());
-                let _ = app.update(Message::SourceEdit(text_editor::Action::SelectAll));
-                let _ = app.update(Message::SourceEdit(text_editor::Action::Edit(
-                    text_editor::Edit::Paste(std::sync::Arc::new(text)),
-                )));
-            }
-            "tool" => app.behavior.topology.choose(CanvasTool::Connect),
-            "busy" => app.busy = true,
-            "form" => {
-                let context = app.topology_context().unwrap();
-                let _ = app.update(Message::TopologyCanvas(CanvasEvent::Begin {
-                    context,
-                    tool: topology::Tool::Work,
-                    control: ControlKind::Choice,
-                    insertion: topology::Insertion::default(),
-                }));
-                assert!(app.behavior.has_pending());
-            }
-            _ => {}
-        }
-        let baseline = app.document.snapshot();
-        let selected = app.multiselect_snapshot().unwrap();
-        let epoch = app.canvas_epoch;
-        let source = app.source_workspace.bundle();
-        if pending != "clean" {
-            let message = begin(&app).unwrap();
-            let _ = app.update(message);
-        }
-        let _ = app.update(Message::Delete);
-        let context = app.topology_context().unwrap();
-        let _ = app.update(Message::TopologyCanvas(CanvasEvent::Remove(
-            context, f.nodes[0],
-        )));
-        assert!(app.delete_target.is_none());
-        assert_eq!(app.canvas_epoch, epoch);
-        assert_eq!(app.multiselect_snapshot().unwrap(), selected);
-        assert_eq!(app.document.bundle(), &baseline.bundle);
-        assert_eq!(app.source_workspace.bundle(), source);
-        assert!(!app.document.can_undo());
-    }
-}
-
-#[test]
-fn process_group_removal_qualified_member_refuses_whole_set_without_path_stripping() {
-    let mut app = native();
-    let owner = alias(app.project(), "caller");
-    let root = alias(app.project(), "r1");
-    let other = alias(app.project(), "r2");
-    let leaf = alias(app.project(), "a");
-    let _ = app.update(Message::Select(owner));
-    let context = app.topology_context().unwrap();
-    let _ = app.update(Message::TopologyCanvas(CanvasEvent::Expand(context, root)));
-    let qualified = Target::ProcessOccurrence(OccurrenceEndpoint {
-        references: vec![root],
-        occurrence: leaf,
-    });
-    choose(&mut app, qualified.clone(), multiselect::Choice::Replace);
-    choose(&mut app, local(other), multiselect::Choice::Add);
-    let selected = app.multiselect_snapshot().unwrap();
-    assert_eq!(selected.targets(), &[qualified, local(other)]);
-    let before = app.document.snapshot();
-    let epoch = app.canvas_epoch;
-    let message = begin(&app).unwrap();
-    let _ = app.update(message);
-    assert!(app.delete_target.is_none());
-    assert_eq!(app.canvas_epoch, epoch);
-    assert_eq!(app.multiselect_snapshot().unwrap(), selected);
-    assert!(std::sync::Arc::ptr_eq(&before, &app.document.snapshot()));
-    assert!(!app.document.can_undo());
-}
-
-#[test]
-fn process_group_removal_unselected_context_subject_does_not_replace_the_group() {
-    for unselected in [false, true] {
-        let (mut app, f) = fixture(Layer::Oa);
-        let selection = app.multiselect_snapshot().unwrap();
-        let clicked = if unselected { f.nodes[2] } else { f.nodes[0] };
-        let mut request = model_menu::Request::object(clicked, iced::Point::ORIGIN);
-        request.process = app.topology_context().map(Box::new);
-        request.selection_target = Some(Box::new(local(clicked)));
-        let _ = app.update(Message::Menu(model_menu::Event::Open(request)));
-        let token = app.model_menu.as_ref().unwrap().token;
-        let message = begin(&app).unwrap();
-        let _ = app.update(Message::Menu(model_menu::Event::Invoke(
-            token,
-            Box::new(message),
-        )));
-        let review = app
-            .delete_target
-            .as_ref()
-            .unwrap()
-            .process
-            .as_ref()
-            .unwrap();
-        assert_eq!(review.snapshot.targets(), selection.targets());
-        assert_eq!(review.snapshot.primary(), selection.primary());
-        assert!(!review.plan.removed.contains(&f.nodes[2]));
-    }
-}
-
-#[test]
-fn process_review_lists_transitive_callers_even_when_all_modes_stay_explicit() {
-    let mut app = native();
-    let a = alias(app.project(), "a");
-    let link = alias(app.project(), "approved");
-    choose(&mut app, local(a), multiselect::Choice::Replace);
-    choose(
-        &mut app,
-        Target::ProcessLink(link),
-        multiselect::Choice::Add,
-    );
-    let token = open(&mut app);
-    let review = app
-        .delete_target
-        .as_ref()
-        .unwrap()
-        .process
-        .as_ref()
-        .unwrap();
-    assert!(
-        review.plan.interpretation.is_empty(),
-        "remaining Control keeps the definition explicit"
-    );
-    let rows = view::matching_rows(app.project(), review);
-    for alias in ["@caller", "@outer"] {
-        assert!(
-            rows.iter().any(|row| row.label.contains(alias)
-                && row.disposition.contains("Uses changed definition"))
-        );
-    }
-    send(
-        &mut app,
-        Event::Query {
-            token,
-            query: "@outer".into(),
-        },
-    );
-    let review = app
-        .delete_target
-        .as_ref()
-        .unwrap()
-        .process
-        .as_ref()
-        .unwrap();
-    let rows = view::matching_rows(app.project(), review);
-    assert_eq!(rows.len(), 1);
-    assert!(rows[0].label.contains("@assessment"));
-    assert!(rows[0].label.contains("03 Mission using Response"));
-}
-
-#[tokio::test]
-async fn mounted_process_group_delete_and_shift_delete_capture_group_escape_is_stamped() {
-    use crate::behavior::canvas_workspace::tests::{Mounted, key};
-    use iced::{
-        keyboard::{self, key::Named},
-        mouse,
-    };
-    for shift in [false, true] {
-        let (mut app, _) = fixture(Layer::Oa);
-        let selected = app.multiselect_snapshot().unwrap();
-        let source = app.document.bundle().clone();
-        let mut mounted = Mounted::new(&mut app).await;
-        mounted
-            .batch(&mut app, &[key(Named::F6)], mouse::Cursor::Unavailable)
-            .await;
-        let mut remove = key(Named::Delete);
-        if let iced::Event::Keyboard(keyboard::Event::KeyPressed { modifiers, .. }) = &mut remove {
-            *modifiers = if shift {
-                keyboard::Modifiers::SHIFT
-            } else {
-                keyboard::Modifiers::default()
-            };
-        }
-        let output = mounted
-            .batch(&mut app, &[remove.clone()], mouse::Cursor::Unavailable)
-            .await;
-        assert!(output.iter().any(|message| matches!(message, Message::ProcessRemoval(event) if matches!(&**event, Event::Begin { snapshot, .. } if snapshot.targets() == selected.targets()))), "{output:?}");
-        let token = app.delete_target.as_ref().unwrap().snapshot.token;
-        if let iced::Event::Keyboard(keyboard::Event::KeyPressed { repeat, .. }) = &mut remove {
-            *repeat = true;
-        }
-        let output = mounted
-            .batch(&mut app, &[remove], mouse::Cursor::Unavailable)
-            .await;
-        assert!(
-            !output
-                .iter()
-                .any(|message| matches!(message, Message::ConfirmDelete(_)))
-        );
-        assert_eq!(app.delete_target.as_ref().unwrap().snapshot.token, token);
-        let output = mounted
-            .batch(&mut app, &[key(Named::Escape)], mouse::Cursor::Unavailable)
-            .await;
-        assert!(output.iter().any(|message| matches!(message, Message::ProcessRemoval(event) if matches!(&**event, Event::Cancel { token: captured } if *captured == token))), "{output:?}");
-        assert!(app.delete_target.is_none());
-        assert_eq!(app.document.bundle(), &source);
-        assert_eq!(
-            app.multiselect_snapshot().unwrap().targets(),
-            selected.targets()
-        );
-        assert!(!app.document.can_undo());
-    }
-}
-
-#[tokio::test]
-async fn mounted_process_group_removal_queued_delete_is_revoked_by_later_press_in_same_batch() {
-    use crate::behavior::canvas_workspace::tests::{Mounted, key};
-    use iced::{Event as Input, keyboard::key::Named, mouse};
-    let (mut app, f) = fixture(Layer::Oa);
-    let mut mounted = Mounted::new(&mut app).await;
-    mounted
-        .batch(&mut app, &[key(Named::F6)], mouse::Cursor::Unavailable)
-        .await;
-    let bounds = mounted.geometry(&app).bounds("process-viewport");
-    let local = app
-        .behavior
-        .topology
-        .removal_test_point(&app, f.owner, f.nodes[0], None);
-    let at = bounds.position() + iced::Vector::new(local.x, local.y);
-    let before = app.document.snapshot();
-    let selected = app.multiselect_snapshot().unwrap();
-    let epoch = app.canvas_epoch;
-    let messages = mounted
-        .batch(
-            &mut app,
-            &[
-                key(Named::Delete),
-                Input::Mouse(mouse::Event::CursorMoved { position: at }),
-                Input::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)),
-            ],
-            mouse::Cursor::Available(at),
-        )
-        .await;
-    assert!(messages.iter().any(|message| matches!(message, Message::ProcessRemoval(event) if matches!(&**event, Event::Begin { .. }))), "the first event queues a real review packet: {messages:?}");
-    assert!(
-        app.delete_target.is_none(),
-        "later press must revoke that packet before App consumes it"
-    );
-    assert_eq!(
-        app.canvas_epoch, epoch,
-        "refusal does not retire the active gesture"
-    );
-    assert_eq!(app.multiselect_snapshot().unwrap(), selected);
-    assert!(std::sync::Arc::ptr_eq(&before, &app.document.snapshot()));
-    assert!(!app.process_removal_enabled());
-    assert!(
-        begin(&app).is_none(),
-        "active gesture cannot capture another review"
-    );
-    mounted
-        .batch(
-            &mut app,
-            &[key(Named::Escape)],
-            mouse::Cursor::Available(at),
-        )
-        .await;
-    // Escape leaves viewport focus; F6 restores keyboard ownership and sends
-    // the canvas cancellation boundary before a fresh Delete.
-    mounted
-        .batch(&mut app, &[key(Named::F6)], mouse::Cursor::Unavailable)
-        .await;
-    assert!(app.process_removal_enabled());
-    // Cancelling the pointer gesture retains the group and permits a fresh review.
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        selected.targets()
-    );
-    mounted
-        .batch(&mut app, &[key(Named::Delete)], mouse::Cursor::Unavailable)
-        .await;
-    assert!(app.delete_target.is_some());
-    assert!(std::sync::Arc::ptr_eq(&before, &app.document.snapshot()));
-}
-
-#[tokio::test]
-async fn mounted_process_group_removal_queued_delete_is_revoked_by_camera_pan_start() {
-    use crate::behavior::canvas_workspace::tests::{Mounted, key};
-    use iced::{Event as Input, keyboard::key::Named, mouse};
-    for button in [mouse::Button::Middle, mouse::Button::Left] {
-        let (mut app, _) = fixture(Layer::Sa);
-        let mut mounted = Mounted::new(&mut app).await;
-        mounted
-            .batch(&mut app, &[key(Named::F6)], mouse::Cursor::Unavailable)
-            .await;
-        let bounds = mounted.geometry(&app).bounds("process-viewport");
-        let at = iced::Point::new(
-            bounds.x + bounds.width - 12.,
-            bounds.y + bounds.height - 12.,
-        );
-        let before = app.document.snapshot();
-        let messages = mounted
-            .batch(
-                &mut app,
-                &[
-                    key(Named::Delete),
-                    Input::Mouse(mouse::Event::CursorMoved { position: at }),
-                    Input::Mouse(mouse::Event::ButtonPressed(button)),
-                ],
-                mouse::Cursor::Available(at),
-            )
-            .await;
-        assert!(messages.iter().any(|message| matches!(message, Message::ProcessRemoval(event) if matches!(&**event, Event::Begin { .. }))), "real Delete is queued: {messages:?}");
-        assert!(
-            app.delete_target.is_none(),
-            "camera input retires earlier review packet"
-        );
-        assert!(std::sync::Arc::ptr_eq(&before, &app.document.snapshot()));
-        assert!(!app.document.can_undo());
-    }
-}

crates/oa-desktop/src/app/process_removal/view.rs

@@ -1,156 +0,0 @@
-//! Review the complete captured removal impact before one explicit confirmation.
-use super::{Event, Review};
-use crate::app::{App, Message, diagram_removal};
-use crate::diagram_usage::Target;
-use crate::style;
-use iced::widget::{button, column, container, row, scrollable, text, text_input};
-use iced::{Element, Length::Fill};
-use oa_core::Project;
-use std::collections::BTreeSet;
-
-const PAGE_SIZE: usize = 6;
-
-pub(super) fn matching_rows(
-    project: &Project,
-    review: &Review,
-) -> Vec<super::super::removal_review::ImpactRow> {
-    let selected = review
-        .snapshot
-        .targets()
-        .iter()
-        .filter_map(|target| match target {
-            Target::ProcessOccurrence(endpoint) if endpoint.references.is_empty() => {
-                Some(endpoint.occurrence)
-            }
-            Target::ProcessLink(id) => Some(*id),
-            _ => None,
-        })
-        .collect();
-    super::super::removal_review::matching_rows(
-        project,
-        &review.plan.removed,
-        &review.plan.changed,
-        &selected,
-        &review.plan.interpretation,
-        &review.plan.affected_uses,
-        &review.query,
-    )
-}
-
-pub(crate) fn view<'a>(
-    app: &'a App,
-    target: &'a diagram_removal::Confirmation,
-) -> Element<'a, Message> {
-    let Some(review) = target.process.as_ref() else {
-        return text("Process removal review is unavailable.").into();
-    };
-    let token = target.snapshot.token;
-    let valid = app.process_removal_review_valid(target);
-    let rows = matching_rows(app.project(), review);
-    let callers: BTreeSet<_> = review
-        .plan
-        .affected_uses
-        .values()
-        .flatten()
-        .chain(
-            review
-                .plan
-                .interpretation
-                .iter()
-                .flat_map(|impact| impact.callers.iter()),
-        )
-        .copied()
-        .collect();
-    let semantic_summary = if review.plan.interpretation.is_empty() && callers.is_empty() {
-        "No listed-order or analysis-mode changes; no affected caller definitions.".to_owned()
-    } else {
-        format!(
-            "Order / analysis changes in {} definitions · {} caller definitions affected. Review their effects below.",
-            review.plan.interpretation.len(),
-            callers.len()
-        )
-    };
-    let pages = rows.len().div_ceil(PAGE_SIZE).max(1);
-    let page = review.page.min(pages - 1);
-    let mut impacts = column![].spacing(12).width(Fill);
-    for impact in rows.iter().skip(page * PAGE_SIZE).take(PAGE_SIZE) {
-        impacts = impacts.push(
-            column![
-                text(impact.disposition.clone())
-                    .size(12)
-                    .color(style::MUTED),
-                text(impact.label.clone())
-                    .size(13)
-                    .width(Fill)
-                    .wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-            ]
-            .spacing(3)
-            .width(Fill),
-        );
-    }
-    if rows.is_empty() {
-        impacts = impacts.push(text("No matching effects. Try a name, alias or effect.").size(13));
-    }
-    let previous = button("Previous").on_press_maybe((page > 0).then(|| {
-        Message::ProcessRemoval(Box::new(Event::Page {
-            token,
-            page: page - 1,
-        }))
-    }));
-    let next = button("Next").on_press_maybe((page + 1 < pages).then(|| {
-        Message::ProcessRemoval(Box::new(Event::Page {
-            token,
-            page: page + 1,
-        }))
-    }));
-    let mut footer = column![].spacing(8).width(Fill);
-    if !valid {
-        footer = footer.push(
-            text("This review expired. Cancel and review the current selection again.")
-                .size(13)
-                .width(Fill)
-                .wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-        );
-    }
-    footer = footer.push(
-        row![
-            container(
-                button("Cancel")
-                    .padding(10)
-                    .on_press(Message::ProcessRemoval(Box::new(Event::Cancel { token })))
-            )
-            .id("delete-cancel"),
-            container(
-                button("Remove selected contributions / links")
-                    .style(button::danger)
-                    .padding(10)
-                    .on_press_maybe(valid.then_some(Message::ConfirmDelete(token)))
-            )
-            .id("delete-confirm"),
-        ]
-        .spacing(10),
-    );
-    column![
-        text(format!("Remove {} selected contributions / links?", review.snapshot.targets().len())).size(21),
-        text(format!("{} records removed · {} records updated", review.plan.removed.len(), review.plan.changed.len())).size(14),
-        text(semantic_summary).size(13).width(Fill).wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-        text_input("Search affected names, aliases or effects", &review.query)
-            .id("process-removal-query")
-            .on_input(move |query| Message::ProcessRemoval(Box::new(Event::Query { token, query })))
-            .size(13),
-        row![previous, text(format!("Page {} of {} · {} matches", page + 1, pages, rows.len())).size(12), next]
-            .spacing(10).align_y(iced::Alignment::Center),
-        scrollable(column![
-            text("Removes selected local contributions or maintained links and the additional records listed below. Referenced definitions, work and exchanges are preserved. Reused topology, entry/exit connections and diagnostics may change. Review every listed order and affected caller definition; this review does not compute complete caller graphs. One Undo restores the entire change.")
-                .size(13).width(Fill).wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-            impacts,
-        ].spacing(14).width(Fill))
-            .width(Fill).height(Fill).spacing(8).id("process-removal-impact"),
-        footer,
-    ]
-    .spacing(12)
-    .width(Fill)
-    // Keep confirmation and search outside the flexible, scrollable impact body.
-    .height((app.window_size.height - 160.).clamp(260., 570.))
-    .into()
-}

crates/oa-desktop/src/app/removal_review.rs

@@ -1,148 +0,0 @@
-//! Shared stored-record and derived Process effect descriptions.
-use oa_core::{Id, Project};
-use std::collections::{BTreeMap, BTreeSet};
-
-pub(crate) struct ImpactRow {
-    pub(crate) label: String,
-    pub(crate) disposition: String,
-}
-
-pub(crate) fn matching_rows(
-    project: &Project,
-    removed: &BTreeSet<Id>,
-    changed: &BTreeSet<Id>,
-    selected: &BTreeSet<Id>,
-    interpretation: &[crate::removal_effects::InterpretationChange],
-    affected_uses: &BTreeMap<Id, BTreeSet<Id>>,
-    query: &str,
-) -> Vec<ImpactRow> {
-    let aliases: BTreeMap<Id, &str> = project.identities().into_iter().collect();
-    let label = |id: Id| {
-        let name = project.named(id);
-        let identity = aliases
-            .get(&id)
-            .map_or_else(|| id.to_string(), |alias| format!("@{alias}"));
-        if name == "Missing object" || name.is_empty() {
-            identity
-        } else {
-            format!("{name} ({identity})")
-        }
-    };
-    let mut rows = vec![];
-    for id in removed {
-        rows.push(ImpactRow {
-            label: label(*id),
-            disposition: if selected.contains(id) {
-                "Removed · selected"
-            } else {
-                "Additional removed"
-            }
-            .into(),
-        });
-    }
-    for id in changed {
-        rows.push(ImpactRow {
-            label: label(*id),
-            disposition: "Updated · preserved".into(),
-        });
-    }
-    // Interpretation is separate from stored record deltas: callers may keep
-    // identical records while their reused definition or analysis changes.
-    for impact in interpretation {
-        let owner = label(impact.owner);
-        let shared_order = impact.before.local_order == impact.before.expanded_order
-            && impact.after.local_order == impact.after.expanded_order;
-        for (dimension, before, after, shown) in [
-            (
-                if shared_order {
-                    "Listed and reused order"
-                } else {
-                    "Local listed order"
-                },
-                &impact.before.local_order,
-                &impact.after.local_order,
-                true,
-            ),
-            (
-                "Order inside reused definitions",
-                &impact.before.expanded_order,
-                &impact.after.expanded_order,
-                !shared_order,
-            ),
-        ] {
-            if !shown || before == after {
-                continue;
-            }
-            for (when, order) in [("Before", before), ("After", after)] {
-                let summary = match order {
-                    None => "Explicit topology; no implicit listed order".to_owned(),
-                    Some(ids) if ids.is_empty() => {
-                        "Empty order; no ordered pair; contextual flow may be incomplete".to_owned()
-                    }
-                    Some(ids) if ids.len() == 1 => {
-                        "One item in this order; no ordered pair".to_owned()
-                    }
-                    Some(ids) => format!(
-                        "Implicit listed order; {} adjacent ordered pairs",
-                        ids.len() - 1
-                    ),
-                };
-                rows.push(ImpactRow {
-                    label: format!("{owner}: {summary}"),
-                    disposition: format!("{when} · {dimension}"),
-                });
-                if let Some(ids) = order {
-                    for (index, id) in ids.iter().enumerate() {
-                        rows.push(ImpactRow {
-                            label: format!("{owner}: #{} {}", index + 1, label(*id)),
-                            disposition: format!("{when} · {dimension} · listed position"),
-                        });
-                    }
-                }
-            }
-        }
-        if impact.before.contextual_analysis != impact.after.contextual_analysis {
-            rows.push(ImpactRow {
-                label: format!(
-                    "{owner}: contextual analysis {} → {}",
-                    if impact.before.contextual_analysis {
-                        "enabled"
-                    } else {
-                        "disabled"
-                    },
-                    if impact.after.contextual_analysis {
-                        "enabled"
-                    } else {
-                        "disabled"
-                    }
-                ),
-                disposition:
-                    "Analysis mode changes; this is not a claim of complete graph connectivity"
-                        .into(),
-            });
-        }
-    }
-    let mut affected = affected_uses.clone();
-    for impact in interpretation {
-        affected
-            .entry(impact.owner)
-            .or_default()
-            .extend(impact.callers.iter().copied());
-    }
-    for (definition, callers) in affected {
-        for caller in callers {
-            rows.push(ImpactRow {
-                label: format!("{} uses {}", label(caller), label(definition)),
-                disposition: "Uses changed definition · affected caller definition".into(),
-            });
-        }
-    }
-    let query = query.trim().to_lowercase();
-    rows.into_iter()
-        .filter(|row| {
-            query.is_empty()
-                || row.label.to_lowercase().contains(&query)
-                || row.disposition.to_lowercase().contains(&query)
-        })
-        .collect()
-}

crates/oa-desktop/src/app/saved_removal.rs

@@ -1,296 +0,0 @@
-//! Explicit saved-view model deletion: one captured group and one transaction.
-use super::*;
-use crate::diagram::group_removal;
-use crate::diagram_selection::Snapshot;
-use crate::diagram_usage::Target;
-use crate::{model_menu, route_edit::Context};
-
-#[cfg(test)]
-mod tests;
-pub(crate) mod view;
-
-#[derive(Debug, Clone)]
-pub(crate) enum Event {
-    Begin {
-        input_generation: u64,
-        context: Context,
-        snapshot: Box<Snapshot>,
-    },
-    Query {
-        token: u64,
-        query: String,
-    },
-    Page {
-        token: u64,
-        page: usize,
-    },
-    Cancel {
-        token: u64,
-    },
-}
-
-pub(crate) struct Review {
-    input_generation: u64,
-    pub(crate) context: Context,
-    pub(crate) snapshot: Snapshot,
-    pub(crate) plan: group_removal::Plan,
-    pub(crate) query: String,
-    pub(crate) page: usize,
-}
-
-fn context(app: &App) -> Option<Context> {
-    let current = match app.page {
-        Page::Diagram => app.route_context()?,
-        Page::Behavior if app.topology_context().is_none() && app.scenario_context().is_none() => {
-            app.state_context()?
-        }
-        _ => return None,
-    };
-    let saved = app.project().diagrams.get(&current.diagram)?;
-    (saved.projection.is_architecture() || saved.projection.state_machine().is_some())
-        .then_some(current)
-}
-
-pub(crate) fn begin(app: &App) -> Option<Message> {
-    let input_generation = app.saved_removal_input.idle()?;
-    let context = context(app)?;
-    let snapshot = app.multiselect_snapshot()?;
-    (snapshot.targets().len() > 1).then_some(Message::SavedRemoval(Box::new(Event::Begin {
-        input_generation,
-        context,
-        snapshot: Box::new(snapshot),
-    })))
-}
-
-impl App {
-    fn saved_removal_selecting(&self) -> bool {
-        self.connection.is_none()
-            && self.selected_bend.is_none()
-            && match self.page {
-                Page::Diagram => self
-                    .architecture
-                    .as_ref()
-                    .is_none_or(|state| !state.inline() && !state.saved.placing),
-                Page::Behavior => {
-                    self.behavior.diagram.tool == crate::behavior::state_edit::Tool::Select
-                }
-                _ => false,
-            }
-    }
-
-    pub(crate) fn saved_removal_enabled(&self) -> bool {
-        diagram_removal::enabled(self)
-            && !self.source_rename.open()
-            && self.saved_removal_selecting()
-            && self.saved_removal_input.idle().is_some()
-            && context(self).is_some()
-    }
-
-    fn saved_removal_matches(&self, captured: Context, snapshot: &Snapshot) -> bool {
-        context(self) == Some(captured)
-            && self.diagram_selection.as_ref().is_some_and(|selection| {
-                selection.matches(snapshot, multiselect::context(captured))
-            })
-            && snapshot
-                .targets()
-                .iter()
-                .all(|target| self.multiselect_target_visible(target))
-    }
-
-    pub(super) fn saved_removal_event(&mut self, event: Event) -> Task<Message> {
-        match event {
-            Event::Begin {
-                input_generation,
-                context: captured,
-                snapshot,
-            } => {
-                // Refuse before source/editor/selection boundaries can disturb a
-                // newer interaction, including a later press in the same batch.
-                if self.saved_removal_input.idle() != Some(input_generation)
-                    || !self.saved_removal_matches(captured, &snapshot)
-                    || !self.saved_removal_enabled()
-                    || snapshot.targets().len() < 2
-                {
-                    return Task::none();
-                }
-                let plan = match group_removal::prepare(
-                    self.project(),
-                    captured.diagram,
-                    snapshot.targets(),
-                ) {
-                    Ok(plan) => plan,
-                    Err(reason) => {
-                        self.status = reason;
-                        return Task::none();
-                    }
-                };
-                let Some(primary_target) = snapshot.primary().cloned() else {
-                    return Task::none();
-                };
-                let (primary, placement) = match &primary_target {
-                    Target::Placement(id) => (
-                        self.project().diagrams[&captured.diagram].nodes[id].element,
-                        Some(*id),
-                    ),
-                    Target::Port { port, .. } => (*port, None),
-                    Target::Edge(id) => (*id, None),
-                    Target::StateRow { relation, .. } => (*relation, None),
-                    _ => return Task::none(),
-                };
-                let Some(token) = self.menu_sequence.checked_add(1) else {
-                    return Task::none();
-                };
-                self.source_interaction();
-                self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-                let context = context(self).expect("admitted saved view");
-                let snapshot = self.multiselect_snapshot().expect("admitted selection");
-                let mut request = model_menu::Request::object(primary, iced::Point::ORIGIN);
-                request.canvas = Some(context);
-                request.placement = placement;
-                request.selection_target = Some(Box::new(primary_target));
-                self.menu_sequence = token;
-                self.delete_target = model_menu::Opened::new(self, request, token).map(|opened| {
-                    diagram_removal::Confirmation {
-                        snapshot: opened,
-                        selection: self.selected,
-                        placement,
-                        behavior_owner: None,
-                        scenario: None,
-                        process: None,
-                        saved: Some(Review {
-                            input_generation,
-                            context,
-                            snapshot,
-                            plan,
-                            query: String::new(),
-                            page: 0,
-                        }),
-                    }
-                });
-                self.delete_pending = self.delete_target.is_some();
-            }
-            Event::Query { token, query } => {
-                if let Some(review) = self
-                    .delete_target
-                    .as_mut()
-                    .filter(|target| target.snapshot.token == token)
-                    .and_then(|target| target.saved.as_mut())
-                {
-                    review.query = query;
-                    review.page = 0;
-                }
-            }
-            Event::Page { token, page } => {
-                if let Some(review) = self
-                    .delete_target
-                    .as_mut()
-                    .filter(|target| target.snapshot.token == token)
-                    .and_then(|target| target.saved.as_mut())
-                {
-                    review.page = page;
-                }
-            }
-            Event::Cancel { token } => {
-                if self
-                    .delete_target
-                    .as_ref()
-                    .is_some_and(|target| target.snapshot.token == token && target.saved.is_some())
-                {
-                    self.delete_target = None;
-                    self.delete_pending = false;
-                    self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-                    self.status = "Model deletion cancelled. Model and selection unchanged.".into();
-                }
-            }
-        }
-        Task::none()
-    }
-
-    pub(crate) fn saved_removal_review_valid(
-        &self,
-        target: &diagram_removal::Confirmation,
-    ) -> bool {
-        let Some(review) = &target.saved else {
-            return false;
-        };
-        self.delete_pending
-            && !self.busy
-            && target.snapshot.valid(self)
-            && self.saved_removal_input.idle() == Some(review.input_generation)
-            && self.saved_removal_matches(review.context, &review.snapshot)
-            && self.selected == target.selection
-            && !self.source_dirty()
-            && !self.draft_dirty()
-            && !self.behavior.has_pending()
-            && !self.source_rename.open()
-            && self.saved_removal_selecting()
-    }
-
-    pub(super) fn confirm_saved_removal(&mut self, token: u64) {
-        let Some(target) = self
-            .delete_target
-            .as_ref()
-            .filter(|target| target.snapshot.token == token && target.saved.is_some())
-        else {
-            return;
-        };
-        let valid = self.saved_removal_review_valid(target);
-        let target = self.delete_target.take().expect("captured saved review");
-        self.delete_pending = false;
-        self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-        if !valid {
-            self.status = "Model deletion review expired. Nothing was deleted; review the current selection again.".into();
-            return;
-        }
-        let review = target.saved.expect("saved review");
-        let machine = self.project().diagrams[&review.context.diagram]
-            .projection
-            .state_machine();
-        match self.document.execute(review.plan.command) {
-            Ok(_) => {
-                self.selected_node = None;
-                self.behavior.diagram.placement = None;
-                // A selected machine can own the current saved view. Retire
-                // those UI references only after its transaction succeeds.
-                if self
-                    .behavior
-                    .active_owner
-                    .is_some_and(|id| !self.project().contains(id))
-                {
-                    self.behavior.active_owner = None;
-                }
-                if self
-                    .behavior
-                    .diagram
-                    .diagram
-                    .is_some_and(|id| !self.project().diagrams.contains_key(&id))
-                {
-                    self.behavior.diagram = Default::default();
-                }
-                if self.page == Page::Behavior
-                    && let Some(machine) = machine.filter(|id| self.project().contains(*id))
-                {
-                    self.selected = machine;
-                    self.behavior.active_owner = Some(machine);
-                } else {
-                    self.selected = if self
-                        .project()
-                        .diagrams
-                        .contains_key(&review.context.diagram)
-                    {
-                        review.context.diagram
-                    } else {
-                        self.project().id
-                    };
-                }
-                self.sync();
-                self.reconcile_multiselect();
-                self.status = format!(
-                    "Deleted {} selected model subjects in one change across all views. Undo restores the model.",
-                    review.plan.selected.len()
-                );
-            }
-            Err(error) => self.status = format!("Nothing deleted: {error}"),
-        }
-    }
-}

crates/oa-desktop/src/app/saved_removal/tests.rs

@@ -1,940 +0,0 @@
-//! Saved semantic removal through App, with independently edited complete models.
-use super::*;
-use crate::diagram_usage::Target;
-use oa_core::*;
-
-fn point(x: f32, y: f32) -> Position {
-    Position { x, y }
-}
-
-fn saved(project: &mut Project, layer: Layer, projection: ProjectionKind) -> Id {
-    let id = Id::new_v4();
-    project.diagrams.insert(
-        id,
-        Diagram {
-            id,
-            alias: format!("saved_{}", id.simple()),
-            name: "Saved view".into(),
-            description: "Authored view metadata must survive".into(),
-            layer,
-            projection,
-            nodes: Default::default(),
-            routes: vec![],
-            layout: None,
-            view_options: Default::default(),
-        },
-    );
-    id
-}
-
-fn architecture(project: Project, diagram: Id) -> App {
-    validate_candidate(&project).unwrap();
-    let layer = project.diagrams[&diagram].layer;
-    let mut app = App::with_project(project);
-    app.page = Page::Diagram;
-    app.layer = layer;
-    app.active_diagram = Some(diagram);
-    app.selected = diagram;
-    app.selected_node = None;
-    app.refresh_draft();
-    app.reconcile_multiselect();
-    app.window_size = iced::Size::new(1600., 1000.);
-    app
-}
-
-fn choose(app: &mut App, targets: &[Target]) {
-    for (index, target) in targets.iter().enumerate() {
-        let context = app.multiselect_context().unwrap();
-        let _ = app.update(Message::DiagramSelection(multiselect::Event::Choose(
-            context,
-            target.clone(),
-            if index == 0 {
-                multiselect::Choice::Replace
-            } else {
-                multiselect::Choice::Add
-            },
-        )));
-    }
-    assert_eq!(app.multiselect_snapshot().unwrap().targets(), targets);
-}
-
-fn send(app: &mut App, event: Event) {
-    let _ = app.update(Message::SavedRemoval(Box::new(event)));
-}
-
-fn open(app: &mut App) -> u64 {
-    assert!(app.saved_removal_enabled());
-    let message = begin(app).expect("captured saved group");
-    let _ = app.update(message);
-    let confirmation = app.delete_target.as_ref().expect("saved group review");
-    assert!(app.saved_removal_review_valid(confirmation));
-    assert!(confirmation.saved.is_some());
-    confirmation.snapshot.token
-}
-
-fn source_matches(app: &App) {
-    let compiled = source_project::compile_bundle(app.document.bundle(), LIMITS).unwrap();
-    assert_eq!(&compiled.decoded.project, app.project());
-    assert_eq!(&compiled.bundle, app.document.bundle());
-    assert_eq!(
-        source_workspace::reachable(&app.source_workspace.bundle()).unwrap(),
-        *app.document.bundle()
-    );
-}
-
-fn mounted_fixture(state_view: bool) -> App {
-    if state_view {
-        let mut f = state_fixture(Layer::Sa);
-        choose(
-            &mut f.app,
-            &[Target::Placement(f.na), Target::Placement(f.nb)],
-        );
-        f.app
-    } else {
-        architecture_fixture(Layer::Sa).app
-    }
-}
-
-fn focus_canvas(mounted: &mut crate::behavior::canvas_workspace::tests::Mounted, app: &App) {
-    use iced::advanced::widget::{self, operation::Focusable};
-    struct Focus;
-    impl widget::Operation for Focus {
-        fn traverse(&mut self, visit: &mut dyn FnMut(&mut dyn widget::Operation)) {
-            visit(self);
-        }
-        fn focusable(
-            &mut self,
-            id: Option<&widget::Id>,
-            _: iced::Rectangle,
-            state: &mut dyn Focusable,
-        ) {
-            if id == Some(&widget::Id::from("diagram-keyboard-owner")) {
-                state.focus();
-            } else {
-                state.unfocus();
-            }
-        }
-    }
-    mounted.operate(app, &mut Focus);
-}
-
-fn shift_delete() -> iced::Event {
-    let mut event =
-        crate::behavior::canvas_workspace::tests::key(iced::keyboard::key::Named::Delete);
-    if let iced::Event::Keyboard(iced::keyboard::Event::KeyPressed { modifiers, .. }) = &mut event {
-        *modifiers = iced::keyboard::Modifiers::SHIFT;
-    }
-    event
-}
-
-#[tokio::test]
-async fn saved_removal_mounted_shift_delete_review_query_and_stamped_escape_preserve_source() {
-    use crate::behavior::canvas_workspace::tests::{Mounted, key};
-    use iced::{keyboard::key::Named, mouse};
-    for state_view in [false, true] {
-        let mut app = mounted_fixture(state_view);
-        let mut mounted = Mounted::new(&mut app).await;
-        focus_canvas(&mut mounted, &app);
-        let selected = app.multiselect_snapshot().unwrap();
-        let before = app.document.snapshot();
-        let messages = mounted
-            .batch(&mut app, &[shift_delete()], mouse::Cursor::Unavailable)
-            .await;
-        assert!(messages.iter().any(|message| matches!(message, Message::SavedRemoval(event) if matches!(&**event, Event::Begin { snapshot, .. } if snapshot.targets() == selected.targets()))), "{state_view}: {messages:?}");
-        let confirmation = app.delete_target.as_ref().unwrap();
-        assert!(app.saved_removal_review_valid(confirmation));
-        let token = confirmation.snapshot.token;
-        send(
-            &mut app,
-            Event::Query {
-                token,
-                query: "no matching record".into(),
-            },
-        );
-        mounted.settle(&mut app).await;
-        assert!(app.saved_removal_review_valid(app.delete_target.as_ref().unwrap()));
-        let messages = mounted
-            .batch(&mut app, &[key(Named::Escape)], mouse::Cursor::Unavailable)
-            .await;
-        assert!(messages.iter().any(|message| matches!(message, Message::SavedRemoval(event) if matches!(&**event, Event::Cancel { token: t } if *t == token))), "{messages:?}");
-        assert!(app.delete_target.is_none());
-        assert!(Arc::ptr_eq(&before, &app.document.snapshot()));
-        assert_eq!(
-            app.multiselect_snapshot().unwrap().targets(),
-            selected.targets()
-        );
-    }
-}
-
-#[tokio::test]
-async fn saved_removal_mounted_later_press_or_tab_revokes_queued_review_before_app() {
-    use crate::behavior::canvas_workspace::tests::{Mounted, key};
-    use iced::{Event as Input, keyboard::key::Named, mouse};
-    for state_view in [false, true] {
-        for tab in [false, true] {
-            let mut app = mounted_fixture(state_view);
-            let mut mounted = Mounted::new(&mut app).await;
-            focus_canvas(&mut mounted, &app);
-            let geometry = mounted.geometry(&app);
-            let bounds = geometry
-                .focused
-                .iter()
-                .find(|(id, _, _)| {
-                    id.as_ref() == Some(&iced::advanced::widget::Id::from("diagram-keyboard-owner"))
-                })
-                .unwrap()
-                .1;
-            let at = iced::Point::new(
-                bounds.x + bounds.width - 12.,
-                bounds.y + bounds.height - 12.,
-            );
-            let before = app.document.snapshot();
-            let boundary = if tab {
-                key(Named::Tab)
-            } else {
-                Input::Mouse(mouse::Event::ButtonPressed(mouse::Button::Middle))
-            };
-            let messages = mounted
-                .batch(
-                    &mut app,
-                    &[
-                        shift_delete(),
-                        Input::Mouse(mouse::Event::CursorMoved { position: at }),
-                        boundary,
-                    ],
-                    mouse::Cursor::Available(at),
-                )
-                .await;
-            assert!(messages.iter().any(|message| matches!(message, Message::SavedRemoval(event) if matches!(&**event, Event::Begin { .. }))), "{state_view}/{tab}: {messages:?}");
-            assert!(
-                app.delete_target.is_none(),
-                "later input must retire the queued request"
-            );
-            assert!(Arc::ptr_eq(&before, &app.document.snapshot()));
-            if !tab {
-                assert!(begin(&app).is_none(), "active pan owns an input lease");
-                mounted
-                    .batch(
-                        &mut app,
-                        &[Input::Window(iced::window::Event::Unfocused)],
-                        mouse::Cursor::Unavailable,
-                    )
-                    .await;
-                assert!(
-                    app.saved_removal_input.idle().is_some(),
-                    "abandoned gesture releases its lease"
-                );
-            }
-        }
-    }
-}
-
-struct Architecture {
-    app: App,
-    diagram: Id,
-    parent: Id,
-    child: Id,
-    survivor: Id,
-    parent_node: Id,
-    child_node: Id,
-    survivor_node: Id,
-    edge: Id,
-    port: Option<Id>,
-    expected: Project,
-}
-
-fn architecture_fixture(layer: Layer) -> Architecture {
-    let mut project = Project::empty();
-    let kind = if layer == Layer::Oa {
-        Kind::Activity
-    } else {
-        Kind::Function
-    };
-    let parent = project.add_element(kind, layer, "Parent", None).unwrap();
-    let child = project
-        .add_element(kind, layer, "Child", Some(parent))
-        .unwrap();
-    let survivor = project.add_element(kind, layer, "Survivor", None).unwrap();
-    project.elements.get_mut(&survivor).unwrap().description =
-        "Unrelated authored description".into();
-    let edge = project.relate(
-        if layer == Layer::Oa {
-            RelationKind::Interaction
-        } else {
-            RelationKind::FunctionalExchange
-        },
-        "Incident",
-        child,
-        survivor,
-    );
-    let port = match project.relations[&edge].body {
-        RelationBody::FunctionalExchange { source_port, .. } => Some(source_port),
-        _ => None,
-    };
-    let diagram = saved(&mut project, layer, ProjectionKind::Overview);
-    let parent_node = project.place(diagram, parent, point(0., 0.));
-    let child_node = project.place(diagram, child, point(40., 100.));
-    let survivor_node = project.place(diagram, survivor, point(800., 50.));
-    project
-        .diagrams
-        .get_mut(&diagram)
-        .unwrap()
-        .routes
-        .push(EdgeRoute {
-            edge,
-            source_attachment: None,
-            target_attachment: None,
-            waypoints: vec![point(450.25, 90.5)],
-            label: None,
-        });
-    let other = saved(&mut project, layer, ProjectionKind::Overview);
-    let other_child = project.place(other, child, point(-40., 100.));
-    project.place(other, survivor, point(700., 100.));
-    project
-        .diagrams
-        .get_mut(&other)
-        .unwrap()
-        .view_options
-        .hidden_edges
-        .push(edge);
-    let mut expected = project.clone();
-    expected.elements.remove(&parent);
-    expected.elements.remove(&child);
-    if let Some(port) = port {
-        expected.elements.remove(&port);
-    }
-    expected.relations.remove(&edge);
-    let view = expected.diagrams.get_mut(&diagram).unwrap();
-    view.nodes.remove(&parent_node);
-    view.nodes.remove(&child_node);
-    view.routes.clear();
-    let view = expected.diagrams.get_mut(&other).unwrap();
-    view.nodes.remove(&other_child);
-    view.view_options.hidden_edges.clear();
-    validate_candidate(&expected).unwrap();
-    let mut app = architecture(project, diagram);
-    let mut targets = vec![
-        Target::Placement(parent_node),
-        Target::Placement(child_node),
-        Target::Edge(edge),
-    ];
-    if let Some(port) = port {
-        targets.push(Target::Port {
-            port,
-            placement: child_node,
-        });
-    }
-    choose(&mut app, &targets);
-    Architecture {
-        app,
-        diagram,
-        parent,
-        child,
-        survivor,
-        parent_node,
-        child_node,
-        survivor_node,
-        edge,
-        port,
-        expected,
-    }
-}
-
-#[test]
-fn saved_architecture_mixed_semantics_are_one_exact_model_source_transaction_in_oa_and_sa() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let mut f = architecture_fixture(layer);
-        let before = f.app.document.snapshot();
-        let selection = f.app.multiselect_snapshot().unwrap();
-        let camera = (f.app.zoom, f.app.pan);
-        let token = open(&mut f.app);
-        let review = f
-            .app
-            .delete_target
-            .as_ref()
-            .unwrap()
-            .saved
-            .as_ref()
-            .unwrap();
-        let mut subjects: BTreeSet<_> = [f.parent, f.child, f.edge].into_iter().collect();
-        subjects.extend(f.port);
-        assert_eq!(review.plan.selected, subjects);
-        assert_eq!(review.snapshot.targets(), selection.targets());
-        assert_eq!(review.snapshot.primary(), selection.primary());
-        assert_eq!(f.app.document.bundle(), &before.bundle);
-        let _ = f.app.update(Message::ConfirmDelete(token));
-        assert_eq!(f.app.project(), &f.expected);
-        assert_eq!(f.app.selected, f.diagram);
-        assert!(f.app.multiselect_snapshot().unwrap().targets().is_empty());
-        assert_eq!((f.app.zoom, f.app.pan), camera);
-        source_matches(&f.app);
-        let after = f.app.document.bundle().clone();
-        let _ = f.app.update(Message::Undo);
-        assert_eq!(f.app.project(), &before.decoded.project);
-        assert_eq!(f.app.document.bundle(), &before.bundle);
-        assert!(!f.app.document.can_undo());
-        let _ = f.app.update(Message::Redo);
-        assert_eq!(f.app.project(), &f.expected);
-        assert_eq!(f.app.document.bundle(), &after);
-        source_matches(&f.app);
-    }
-}
-
-struct States {
-    app: App,
-    diagram: Id,
-    other: Id,
-    machine: Id,
-    region: Id,
-    a: Id,
-    b: Id,
-    na: Id,
-    nb: Id,
-    work: Id,
-    action: Id,
-    row: Id,
-    edge: Id,
-}
-
-fn state_fixture(layer: Layer) -> States {
-    let mut project = Project::empty();
-    let owner = project
-        .add_element(
-            if layer == Layer::Oa {
-                Kind::Entity
-            } else {
-                Kind::System
-            },
-            layer,
-            "Owner",
-            None,
-        )
-        .unwrap();
-    let machine = project
-        .add_element(Kind::StateMachine, layer, "Modes", Some(owner))
-        .unwrap();
-    let region = project
-        .add_element(Kind::Region, layer, "Region", Some(machine))
-        .unwrap();
-    let a = project
-        .add_element(Kind::State, layer, "Operating", Some(region))
-        .unwrap();
-    let b = project
-        .add_element(Kind::State, layer, "Standby", Some(region))
-        .unwrap();
-    let work = project
-        .add_element(
-            if layer == Layer::Oa {
-                Kind::Activity
-            } else {
-                Kind::Function
-            },
-            layer,
-            "Reusable work",
-            None,
-        )
-        .unwrap();
-    let action = project.relate(RelationKind::StateAction, "Entry work", a, work);
-    let row = project.relate(RelationKind::StateTransition, "Internal check", a, a);
-    if let RelationBody::StateTransition {
-        transition_kind, ..
-    } = &mut project.relations.get_mut(&row).unwrap().body
-    {
-        *transition_kind = TransitionKind::Internal;
-    }
-    let edge = project.relate(RelationKind::StateTransition, "Change mode", a, b);
-    let diagram = saved(
-        &mut project,
-        layer,
-        ProjectionKind::StateMachine { machine },
-    );
-    let na = project.place(diagram, a, point(10., 20.));
-    let nb = project.place(diagram, b, point(600., 20.));
-    let other = saved(
-        &mut project,
-        layer,
-        ProjectionKind::StateMachine { machine },
-    );
-    project.place(other, a, point(70., 80.));
-    project.place(other, b, point(670., 80.));
-    let architecture_view = saved(&mut project, layer, ProjectionKind::Overview);
-    project.place(architecture_view, owner, point(0., 0.));
-    validate_candidate(&project).unwrap();
-    let mut app = architecture(project, architecture_view);
-    app.page = Page::Behavior;
-    app.behavior.active_owner = Some(machine);
-    app.behavior.diagram = crate::behavior::state_view::State {
-        diagram: Some(diagram),
-        ..Default::default()
-    };
-    app.selected = diagram;
-    app.refresh_draft();
-    app.reconcile_multiselect();
-    States {
-        app,
-        diagram,
-        other,
-        machine,
-        region,
-        a,
-        b,
-        na,
-        nb,
-        work,
-        action,
-        row,
-        edge,
-    }
-}
-
-#[test]
-fn saved_state_rows_delete_relations_not_referenced_work_and_state_overlap_is_exact() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        for include_owner in [false, true] {
-            let mut f = state_fixture(layer);
-            let mut targets = vec![
-                Target::StateRow {
-                    placement: f.na,
-                    relation: f.action,
-                },
-                Target::StateRow {
-                    placement: f.na,
-                    relation: f.row,
-                },
-            ];
-            if include_owner {
-                targets.push(Target::Placement(f.na));
-            } else {
-                targets.push(Target::Placement(f.nb));
-            }
-            choose(&mut f.app, &targets);
-            let before = f.app.document.snapshot();
-            let camera = (f.app.behavior.diagram.zoom, f.app.behavior.diagram.pan);
-            let mut expected = f.app.project().clone();
-            expected.relations.remove(&f.action);
-            expected.relations.remove(&f.row);
-            expected.relations.remove(&f.edge);
-            let removed_state = if include_owner { f.a } else { f.b };
-            expected.elements.remove(&removed_state);
-            for view in expected.diagrams.values_mut() {
-                view.nodes.retain(|_, node| node.element != removed_state);
-            }
-            validate_candidate(&expected).unwrap();
-            let token = open(&mut f.app);
-            let review = f
-                .app
-                .delete_target
-                .as_ref()
-                .unwrap()
-                .saved
-                .as_ref()
-                .unwrap();
-            assert_eq!(
-                review.context.diagram, f.diagram,
-                "must not resolve stale Architecture field"
-            );
-            assert_eq!(
-                review.plan.selected,
-                [f.action, f.row, removed_state].into_iter().collect()
-            );
-            assert!(!review.plan.removed.contains(&f.work));
-            let _ = f.app.update(Message::ConfirmDelete(token));
-            assert_eq!(f.app.project(), &expected);
-            assert!(f.app.project().contains(f.work));
-            assert_eq!(
-                (f.app.behavior.diagram.zoom, f.app.behavior.diagram.pan),
-                camera
-            );
-            assert!(f.app.project().contains(f.app.selected));
-            source_matches(&f.app);
-            let after = f.app.document.bundle().clone();
-            let _ = f.app.update(Message::Undo);
-            assert_eq!(f.app.project(), &before.decoded.project);
-            assert_eq!(f.app.document.bundle(), &before.bundle);
-            assert!(!f.app.document.can_undo());
-            let _ = f.app.update(Message::Redo);
-            assert_eq!(f.app.project(), &expected);
-            assert_eq!(f.app.document.bundle(), &after);
-        }
-    }
-}
-
-#[test]
-fn saved_cancel_and_stale_modal_packets_preserve_exact_redo_source_selection_and_camera() {
-    let mut f = architecture_fixture(Layer::Sa);
-    f.app
-        .document
-        .execute(Command::Rename(f.survivor, "Future name".into()))
-        .unwrap();
-    let future = f.app.document.snapshot();
-    assert!(f.app.document.undo());
-    f.app.sync();
-    f.app.reconcile_multiselect();
-    let before = f.app.document.snapshot();
-    let editor = f.app.source_editor.text();
-    let selected = f.app.multiselect_snapshot().unwrap();
-    let camera = (f.app.zoom, f.app.pan);
-    let old_begin = begin(&f.app).unwrap();
-    let first = open(&mut f.app);
-    send(&mut f.app, Event::Cancel { token: first });
-    let second = open(&mut f.app);
-    let epoch = f.app.canvas_epoch;
-    for message in [
-        old_begin,
-        Message::ConfirmDelete(first),
-        Message::CancelDelete,
-        Message::Escape,
-        Message::SavedRemoval(Box::new(Event::Cancel { token: first })),
-        Message::SavedRemoval(Box::new(Event::Query {
-            token: first,
-            query: "stale".into(),
-        })),
-        Message::SavedRemoval(Box::new(Event::Page {
-            token: first,
-            page: 999,
-        })),
-    ] {
-        let _ = f.app.update(message);
-        assert_eq!(f.app.delete_target.as_ref().unwrap().snapshot.token, second);
-        assert_eq!(f.app.canvas_epoch, epoch);
-        let review = f
-            .app
-            .delete_target
-            .as_ref()
-            .unwrap()
-            .saved
-            .as_ref()
-            .unwrap();
-        assert!(review.query.is_empty());
-        assert_eq!(review.page, 0);
-    }
-    send(&mut f.app, Event::Cancel { token: second });
-    assert!(Arc::ptr_eq(&before, &f.app.document.snapshot()));
-    assert_eq!(f.app.source_editor.text(), editor);
-    assert_eq!(f.app.source_workspace.bundle(), before.bundle);
-    assert_eq!(
-        f.app.multiselect_snapshot().unwrap().targets(),
-        selected.targets()
-    );
-    assert_eq!(
-        f.app.multiselect_snapshot().unwrap().primary(),
-        selected.primary()
-    );
-    assert_eq!((f.app.zoom, f.app.pan), camera);
-    assert!(f.app.document.can_redo() && !f.app.document.can_undo());
-    let _ = f.app.update(Message::Redo);
-    assert_eq!(f.app.project(), &future.decoded.project);
-    assert_eq!(f.app.document.bundle(), &future.bundle);
-}
-
-#[test]
-fn saved_begin_and_confirm_reject_selection_membership_and_primary_aba() {
-    for after_open in [false, true] {
-        for primary_only in [false, true] {
-            let mut f = architecture_fixture(Layer::Oa);
-            let delayed = begin(&f.app).unwrap();
-            let token = after_open.then(|| open(&mut f.app));
-            let before = f.app.document.snapshot();
-            let captured = f.app.multiselect_snapshot().unwrap();
-            let selected = f.app.diagram_selection.as_mut().unwrap();
-            let primary = captured.primary().unwrap();
-            if primary_only {
-                assert!(selected.set_primary(&Target::Placement(f.parent_node)));
-                assert!(selected.set_primary(primary));
-            } else {
-                assert!(selected.remove(primary));
-                assert!(selected.add(primary.clone(), |_| true));
-            }
-            let restored = f.app.multiselect_snapshot().unwrap();
-            assert_eq!(restored.targets(), captured.targets());
-            assert_eq!(restored.primary(), captured.primary());
-            assert_ne!(restored.generation(), captured.generation());
-            let epoch = f.app.canvas_epoch;
-            let _ = f
-                .app
-                .update(token.map(Message::ConfirmDelete).unwrap_or(delayed));
-            assert!(f.app.delete_target.is_none());
-            assert!(Arc::ptr_eq(&before, &f.app.document.snapshot()));
-            assert_eq!(
-                f.app.multiselect_snapshot().unwrap().targets(),
-                restored.targets()
-            );
-            if !after_open {
-                assert_eq!(f.app.canvas_epoch, epoch);
-            }
-        }
-    }
-}
-
-#[test]
-fn saved_stale_context_packets_do_not_retire_current_selection_or_history() {
-    for change in 0..4 {
-        let mut f = architecture_fixture(Layer::Sa);
-        let delayed = begin(&f.app).unwrap();
-        match change {
-            0 => {
-                f.app.canvas_document = Id::new_v4();
-            }
-            1 => {
-                f.app.canvas_epoch = f.app.canvas_epoch.wrapping_add(1);
-            }
-            2 => {
-                f.app
-                    .document
-                    .execute(Command::Rename(f.survivor, "New revision".into()))
-                    .unwrap();
-            }
-            _ => {
-                f.app.active_diagram = f
-                    .app
-                    .project()
-                    .diagrams
-                    .keys()
-                    .copied()
-                    .find(|id| *id != f.diagram);
-            }
-        }
-        let current = f.app.document.snapshot();
-        let selection = f.app.multiselect_snapshot();
-        let epoch = f.app.canvas_epoch;
-        let _ = f.app.update(delayed);
-        assert!(f.app.delete_target.is_none());
-        assert!(Arc::ptr_eq(&current, &f.app.document.snapshot()));
-        assert_eq!(f.app.multiselect_snapshot(), selection);
-        assert_eq!(f.app.canvas_epoch, epoch);
-    }
-}
-
-#[test]
-fn saved_admission_preserves_property_source_and_state_editor_drafts_and_nonselect_tool() {
-    for pending in ["properties", "source", "form", "tool", "busy"] {
-        let mut f = state_fixture(Layer::Sa);
-        choose(
-            &mut f.app,
-            &[Target::Placement(f.na), Target::Placement(f.nb)],
-        );
-        let delayed = begin(&f.app).unwrap();
-        match pending {
-            "properties" => {
-                let _ = f
-                    .app
-                    .update(Message::Field("/name".into(), "Unapplied".into()));
-            }
-            "source" => {
-                let text = format!("{}\n// pending", f.app.source_workspace.text());
-                let _ = f
-                    .app
-                    .update(Message::SourceEdit(text_editor::Action::SelectAll));
-                let _ = f.app.update(Message::SourceEdit(text_editor::Action::Edit(
-                    text_editor::Edit::Paste(Arc::new(text)),
-                )));
-            }
-            "form" => {
-                let _ = f.app.update(Message::Behavior(behavior::Event::States(
-                    behavior::states::Event::Edit(f.edge),
-                )));
-                let _ = f.app.update(Message::Behavior(behavior::Event::States(
-                    behavior::states::Event::Guard("Retained guard".into()),
-                )));
-            }
-            "tool" => {
-                f.app.behavior.diagram.tool = behavior::state_edit::Tool::Transition;
-            }
-            _ => f.app.busy = true,
-        }
-        let before = f.app.document.snapshot();
-        let source = f.app.source_workspace.bundle();
-        let selection = f.app.multiselect_snapshot();
-        let draft = f
-            .app
-            .draft
-            .as_ref()
-            .map(|d| serde_json::to_value(d.recovery_snapshot()).unwrap());
-        let form = f.app.behavior.recovery_snapshot();
-        let epoch = f.app.canvas_epoch;
-        let _ = f.app.update(delayed);
-        assert!(f.app.delete_target.is_none(), "{pending}");
-        assert!(
-            Arc::ptr_eq(&before, &f.app.document.snapshot()),
-            "{pending}"
-        );
-        assert_eq!(f.app.source_workspace.bundle(), source);
-        assert_eq!(f.app.multiselect_snapshot(), selection);
-        assert_eq!(
-            f.app
-                .draft
-                .as_ref()
-                .map(|d| serde_json::to_value(d.recovery_snapshot()).unwrap()),
-            draft
-        );
-        assert_eq!(f.app.behavior.recovery_snapshot(), form);
-        assert_eq!(f.app.canvas_epoch, epoch);
-    }
-}
-
-#[test]
-fn saved_input_lease_and_finished_gesture_reject_old_packets_at_begin_and_confirm() {
-    for after_open in [false, true] {
-        for finished in [false, true] {
-            let mut f = architecture_fixture(Layer::Oa);
-            let delayed = begin(&f.app).unwrap();
-            let token = after_open.then(|| open(&mut f.app));
-            let before = f.app.document.snapshot();
-            let selected = f.app.multiselect_snapshot().unwrap();
-            let lease = f.app.saved_removal_input.acquire().unwrap();
-            let mut lease = Some(lease);
-            if finished {
-                drop(lease.take());
-            }
-            let _ = f
-                .app
-                .update(token.map(Message::ConfirmDelete).unwrap_or(delayed));
-            assert!(f.app.delete_target.is_none());
-            assert!(Arc::ptr_eq(&before, &f.app.document.snapshot()));
-            assert_eq!(
-                f.app.multiselect_snapshot().unwrap().targets(),
-                selected.targets()
-            );
-            assert_eq!(
-                f.app.multiselect_snapshot().unwrap().primary(),
-                selected.primary()
-            );
-            drop(lease);
-        }
-    }
-}
-
-#[test]
-fn saved_context_menu_keeps_the_whole_group_even_when_unselected_object_was_clicked() {
-    for unselected in [false, true] {
-        let mut f = architecture_fixture(Layer::Sa);
-        let selected = f.app.multiselect_snapshot().unwrap();
-        let (object, placement) = if unselected {
-            (f.survivor, f.survivor_node)
-        } else {
-            (f.child, f.child_node)
-        };
-        let mut request = model_menu::Request::object(object, iced::Point::ORIGIN);
-        request.canvas = f.app.route_context();
-        request.placement = Some(placement);
-        request.selection_target = Some(Box::new(Target::Placement(placement)));
-        let _ = f
-            .app
-            .update(Message::Menu(model_menu::Event::Open(request)));
-        let entries = model_menu::popup(&f.app).unwrap().entries;
-        let invoke = entries
-            .into_iter()
-            .find_map(|entry| match entry {
-                crate::context_menu::Entry::Action { label, message, .. }
-                    if label == "Delete selected from model…" =>
-                {
-                    message
-                }
-                _ => None,
-            })
-            .expect("explicit semantic group menu action");
-        let _ = f.app.update(invoke);
-        let review = f
-            .app
-            .delete_target
-            .as_ref()
-            .unwrap()
-            .saved
-            .as_ref()
-            .unwrap();
-        assert_eq!(review.snapshot.targets(), selected.targets());
-        assert!(!review.plan.selected.contains(&f.survivor));
-    }
-}
-
-#[test]
-fn saved_hide_and_plain_delete_never_promote_mixed_targets_to_model_removal() {
-    for message_kind in ["delete", "hide"] {
-        let mut f = architecture_fixture(Layer::Sa);
-        let before = f.app.document.snapshot();
-        let selected = f.app.multiselect_snapshot().unwrap();
-        let _ = f.app.update(if message_kind == "delete" {
-            Message::Delete
-        } else {
-            Message::HideSelected
-        });
-        assert!(Arc::ptr_eq(&before, &f.app.document.snapshot()));
-        assert_eq!(
-            f.app.multiselect_snapshot().unwrap().targets(),
-            selected.targets()
-        );
-        assert!(f.app.delete_target.is_none());
-        let token = open(&mut f.app);
-        let _ = f.app.update(Message::ConfirmDelete(token));
-        assert_eq!(f.app.project(), &f.expected);
-    }
-    let mut f = architecture_fixture(Layer::Oa);
-    choose(
-        &mut f.app,
-        &[
-            Target::Placement(f.parent_node),
-            Target::Placement(f.survivor_node),
-        ],
-    );
-    let mut expected = f.app.project().clone();
-    let view = expected.diagrams.get_mut(&f.diagram).unwrap();
-    view.nodes.remove(&f.parent_node);
-    view.nodes.remove(&f.survivor_node);
-    let _ = f.app.update(Message::HideSelected);
-    assert_eq!(f.app.project(), &expected);
-    assert!(f.app.project().contains(f.parent) && f.app.project().contains(f.survivor));
-    source_matches(&f.app);
-}
-
-#[test]
-fn saved_state_owner_deletion_removes_owned_views_and_chooses_surviving_inspection_context() {
-    let mut f = state_fixture(Layer::Sa);
-    let mut project = f.app.project().clone();
-    let owner_node = project.place(f.diagram, f.machine, point(-400., -200.));
-    f.app.document = Document::from_project(project.clone(), LIMITS).unwrap();
-    f.app.source_workspace = Workspace::new(f.app.document.bundle(), true);
-    f.app.sync();
-    f.app.reconcile_multiselect();
-    choose(
-        &mut f.app,
-        &[Target::Placement(owner_node), Target::Placement(f.na)],
-    );
-    let before = f.app.document.snapshot();
-    let mut expected = project;
-    for id in [f.machine, f.region, f.a, f.b] {
-        expected.elements.remove(&id);
-    }
-    for id in [f.action, f.row, f.edge] {
-        expected.relations.remove(&id);
-    }
-    expected.diagrams.remove(&f.diagram);
-    expected.diagrams.remove(&f.other);
-    validate_candidate(&expected).unwrap();
-    let token = open(&mut f.app);
-    let _ = f.app.update(Message::ConfirmDelete(token));
-    assert_eq!(f.app.project(), &expected);
-    assert!(f.app.project().contains(f.app.selected));
-    assert!(
-        f.app
-            .behavior
-            .active_owner
-            .is_none_or(|id| f.app.project().contains(id))
-    );
-    assert!(
-        f.app
-            .behavior
-            .diagram
-            .diagram
-            .is_none_or(|id| f.app.project().diagrams.contains_key(&id))
-    );
-    assert!(
-        f.app
-            .multiselect_snapshot()
-            .is_none_or(|s| s.targets().is_empty())
-    );
-    source_matches(&f.app);
-    let _ = f.app.update(Message::Undo);
-    assert_eq!(f.app.project(), &before.decoded.project);
-    assert_eq!(f.app.document.bundle(), &before.bundle);
-    assert!(!f.app.document.can_undo());
-}

crates/oa-desktop/src/app/saved_removal/view.rs

@@ -1,145 +0,0 @@
-//! Review the complete captured removal impact before one explicit confirmation.
-use super::{Event, Review};
-use crate::app::{App, Message, diagram_removal};
-use crate::style;
-use iced::widget::{button, column, container, row, scrollable, text, text_input};
-use iced::{Element, Length::Fill};
-use oa_core::Project;
-use std::collections::BTreeSet;
-
-const PAGE_SIZE: usize = 6;
-
-pub(super) fn matching_rows(
-    project: &Project,
-    review: &Review,
-) -> Vec<super::super::removal_review::ImpactRow> {
-    super::super::removal_review::matching_rows(
-        project,
-        &review.plan.removed,
-        &review.plan.changed,
-        &review.plan.selected,
-        &review.plan.interpretation,
-        &review.plan.affected_uses,
-        &review.query,
-    )
-}
-
-pub(crate) fn view<'a>(
-    app: &'a App,
-    target: &'a diagram_removal::Confirmation,
-) -> Element<'a, Message> {
-    let Some(review) = target.saved.as_ref() else {
-        return text("Model deletion review is unavailable.").into();
-    };
-    let token = target.snapshot.token;
-    let valid = app.saved_removal_review_valid(target);
-    let rows = matching_rows(app.project(), review);
-    let callers: BTreeSet<_> = review
-        .plan
-        .affected_uses
-        .values()
-        .flatten()
-        .chain(
-            review
-                .plan
-                .interpretation
-                .iter()
-                .flat_map(|impact| impact.callers.iter()),
-        )
-        .copied()
-        .collect();
-    let semantic_summary = if review.plan.interpretation.is_empty() && callers.is_empty() {
-        "No detected Process order/analysis changes or affected Process caller definitions."
-            .to_owned()
-    } else {
-        format!(
-            "Order / analysis changes in {} definitions · {} caller definitions affected. Review their effects below.",
-            review.plan.interpretation.len(),
-            callers.len()
-        )
-    };
-    let pages = rows.len().div_ceil(PAGE_SIZE).max(1);
-    let page = review.page.min(pages - 1);
-    let mut impacts = column![].spacing(12).width(Fill);
-    for impact in rows.iter().skip(page * PAGE_SIZE).take(PAGE_SIZE) {
-        impacts = impacts.push(
-            column![
-                text(impact.disposition.clone())
-                    .size(12)
-                    .color(style::MUTED),
-                text(impact.label.clone())
-                    .size(13)
-                    .width(Fill)
-                    .wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-            ]
-            .spacing(3)
-            .width(Fill),
-        );
-    }
-    if rows.is_empty() {
-        impacts = impacts.push(text("No matching effects. Try a name, alias or effect.").size(13));
-    }
-    let previous = button("Previous").on_press_maybe((page > 0).then(|| {
-        Message::SavedRemoval(Box::new(Event::Page {
-            token,
-            page: page - 1,
-        }))
-    }));
-    let next = button("Next").on_press_maybe((page + 1 < pages).then(|| {
-        Message::SavedRemoval(Box::new(Event::Page {
-            token,
-            page: page + 1,
-        }))
-    }));
-    let mut footer = column![].spacing(8).width(Fill);
-    if !valid {
-        footer = footer.push(
-            text("This review expired. Cancel and review the current selection again.")
-                .size(13)
-                .width(Fill)
-                .wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-        );
-    }
-    footer = footer.push(
-        row![
-            container(
-                button("Cancel")
-                    .padding(10)
-                    .on_press(Message::SavedRemoval(Box::new(Event::Cancel { token })))
-            )
-            .id("delete-cancel"),
-            container(
-                button("Delete selected from model")
-                    .style(button::danger)
-                    .padding(10)
-                    .on_press_maybe(valid.then_some(Message::ConfirmDelete(token)))
-            )
-            .id("delete-confirm"),
-        ]
-        .spacing(10),
-    );
-    column![
-        text(format!("Delete {} model subjects?", review.plan.selected.len())).size(21),
-        text(format!("{} selected diagram objects · {} unique model subjects", review.snapshot.targets().len(), review.plan.selected.len())).size(13),
-        text(format!("{} records removed · {} records updated", review.plan.removed.len(), review.plan.changed.len())).size(14),
-        text(semantic_summary).size(13).width(Fill).wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-        text_input("Search affected names, aliases or effects", &review.query)
-            .id("saved-removal-query")
-            .on_input(move |query| Message::SavedRemoval(Box::new(Event::Query { token, query })))
-            .size(13),
-        row![previous, text(format!("Page {} of {} · {} matches", page + 1, pages, rows.len())).size(12), next]
-            .spacing(10).align_y(iced::Alignment::Center),
-        scrollable(column![
-            text("Deletes the selected model subjects and their listed dependent records across all views. This is different from hiding placements. Removing a State row preserves its referenced work; deleting a trace preserves its endpoints unless separately selected or owned by another deleted subject. Reused Process definitions may change; review their listed effects and callers. One Undo restores the entire model and source change.")
-                .size(13).width(Fill).wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-            impacts,
-        ].spacing(14).width(Fill))
-            .width(Fill).height(Fill).spacing(8).id("saved-removal-impact"),
-        footer,
-    ]
-    .spacing(12)
-    .width(Fill)
-    // Keep confirmation and search outside the flexible, scrollable impact body.
-    .height((app.window_size.height - 160.).clamp(260., 570.))
-    .into()
-}

crates/oa-desktop/src/app/scenario_multiselect.rs

@@ -1,135 +0,0 @@
-//! Exact rendered Scenario selection, independent of semantic movement permission.
-use super::*;
-use crate::behavior::scenario::{self, selection};
-use crate::diagram_selection::Selection;
-use crate::diagram_usage::Target;
-
-#[cfg(test)]
-mod tests;
-
-impl App {
-    pub(crate) fn scenario_selection_envelope(&self, event: &selection::Event) -> bool {
-        self.scenario_context() == Some(event.context)
-            && self.diagram_selection.as_ref().is_some_and(|selected| {
-                selected.matches(&event.snapshot, selection::context(event.context))
-            })
-    }
-
-    pub(super) fn reconcile_scenario_multiselect(&mut self) {
-        let Some(context) = self.scenario_context() else {
-            return;
-        };
-        let scope = selection::context(context).scope;
-        let visible = selection::visible(self.project(), context, self.selected);
-        let old = self
-            .diagram_selection
-            .as_ref()
-            .filter(|s| s.scope() == scope)
-            .and_then(Selection::primary)
-            .cloned();
-        let legacy = Target::ScenarioObject(self.selected);
-        let held = old.as_ref() == Some(&legacy);
-        let lost = old.as_ref().is_some_and(|target| !visible.contains(target));
-        let selected = self
-            .diagram_selection
-            .get_or_insert_with(|| Selection::new(scope));
-        selected.reconcile(scope, |target| visible.contains(target));
-        if held || lost {
-            if selected.primary() != old.as_ref() {
-                self.inspect_scenario_multiselect_primary();
-            }
-        } else if selected.primary() != Some(&legacy) {
-            if visible.contains(&legacy) {
-                selected.replace(legacy, |target| visible.contains(target));
-            } else {
-                selected.clear();
-            }
-        }
-    }
-
-    pub(super) fn inspect_scenario_multiselect_primary(&mut self) {
-        let Some(context) = self.scenario_context() else {
-            return;
-        };
-        self.selected = match self.diagram_selection.as_ref().and_then(Selection::primary) {
-            Some(Target::ScenarioObject(id)) => *id,
-            _ => context.scenario,
-        };
-        self.selected_node = None;
-        self.selected_bend = None;
-        self.selected_attachment = None;
-        self.behavior.diagram.placement = None;
-        self.diagram_navigation_focus = None;
-        self.refresh_draft();
-    }
-
-    /// This is dispatched before shared navigation/gesture retirement. Invalid
-    /// captures and unchanged selection must not disturb a newer input owner.
-    pub(super) fn scenario_selection_event(&mut self, event: selection::Event) -> Task<Message> {
-        use multiselect::Choice;
-        use selection::Intent;
-        if !self.scenario_selection_envelope(&event) {
-            return Task::none();
-        }
-        let visible = selection::visible(self.project(), event.context, self.selected);
-        if !event.snapshot.targets().iter().all(|t| visible.contains(t)) {
-            return Task::none();
-        }
-        if !diagram_removal::enabled(self)
-            || self.source_rename.open()
-            || self.behavior.scenario.canvas_tool(event.context.scenario)
-                != scenario::CanvasTool::Select
-        {
-            self.status =
-                "Finish or cancel the active edit before changing the Scenario selection.".into();
-            return Task::none();
-        }
-        let selected = self.diagram_selection.as_mut().expect("admitted selection");
-        let valid = |target: &Target| visible.contains(target);
-        let changed = match &event.intent {
-            Intent::Choose(target, choice) => {
-                if !valid(target) {
-                    return Task::none();
-                }
-                match choice {
-                    Choice::Replace => selected.replace(target.clone(), valid),
-                    Choice::Add => selected.add(target.clone(), valid),
-                    Choice::Remove => selected.remove(target),
-                    Choice::Toggle => selected.toggle(target.clone(), valid),
-                    Choice::Inspect => selected.set_primary(target),
-                }
-            }
-            Intent::Collapse(target) => {
-                if !selected.contains(target) || !valid(target) {
-                    return Task::none();
-                }
-                selected.replace(target.clone(), valid)
-            }
-            Intent::Clear => selected.clear(),
-            Intent::Refuse(reason) => {
-                self.status = reason.clone();
-                return Task::none();
-            }
-        };
-        if changed {
-            self.scenario_reorder_cancel();
-            self.source_interaction();
-            self.reconcile_pending_diagram_reveal(&Message::ScenarioCanvas(
-                scenario::CanvasEvent::Selection(Box::new(event)),
-            ));
-            self.behavior.scenario.cancel_spacing();
-            // Every generation change, including a secondary membership ABA,
-            // retires old singleton spacing packets as well as group captures.
-            self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-            self.inspect_scenario_multiselect_primary();
-        }
-        Task::none()
-    }
-
-    pub(super) fn scenario_group_selected(&self) -> bool {
-        self.scenario_context().is_some()
-            && self
-                .multiselect_snapshot()
-                .is_some_and(|s| s.targets().len() > 1)
-    }
-}

crates/oa-desktop/src/app/scenario_multiselect/tests.rs

@@ -1,379 +0,0 @@
-use super::*;
-use crate::behavior::scenario::{CanvasEvent, selection::Intent, spacing};
-use crate::behavior::scenario_layout::Representation;
-use crate::diagram_usage::Surface;
-use iced::{Size, Vector};
-
-fn setup(saved: bool) -> (App, Id, Id, Id, Id) {
-    let (document, owner, diagram, lane, message) = spacing::controller::tests::fixture();
-    let mut app = App::with_project(document.project().clone());
-    let _ = app.update(Message::Select(owner));
-    if saved {
-        let _ = app.update(Message::Diagram(super::super::Choice {
-            id: diagram,
-            label: "Saved".into(),
-        }));
-    } else {
-        let _ = app.update(Message::Page(Page::Behavior));
-    }
-    let context = app.scenario_context().unwrap();
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Viewport(
-        context,
-        Size::new(900., 600.),
-    )));
-    assert!(app.multiselect_snapshot().unwrap().targets().is_empty());
-    (app, owner, diagram, lane, message)
-}
-
-fn capture(app: &App, intent: Intent) -> selection::Event {
-    selection::Event {
-        context: app.scenario_context().unwrap(),
-        snapshot: app.multiselect_snapshot().unwrap(),
-        intent,
-    }
-}
-fn send(app: &mut App, event: selection::Event) {
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(
-        event,
-    ))));
-}
-fn choose(app: &mut App, id: Id, choice: multiselect::Choice) {
-    send(
-        app,
-        capture(app, Intent::Choose(Target::ScenarioObject(id), choice)),
-    );
-}
-fn inert(app: &mut App, messages: Vec<Message>, preserve_status: bool) {
-    let model = app.project().clone();
-    let bundle = app.document.bundle().clone();
-    let source = app.source_workspace.bundle();
-    let revision = app.document.revision();
-    let history = (app.document.can_undo(), app.document.can_redo());
-    let selected = app.multiselect_snapshot();
-    let primary = app.selected;
-    let context = app.scenario_context();
-    let camera = app.camera_boundary();
-    let status = app.status.clone();
-    let spacing = (
-        app.behavior.scenario.spacing_stamp(),
-        app.behavior.scenario.spacing_token(),
-    );
-    for message in messages {
-        let _ = app.update(message);
-        assert_eq!(app.project(), &model);
-        assert_eq!(app.document.bundle(), &bundle);
-        assert_eq!(app.source_workspace.bundle(), source);
-        assert_eq!(app.document.revision(), revision);
-        assert_eq!((app.document.can_undo(), app.document.can_redo()), history);
-        assert_eq!(app.multiselect_snapshot(), selected);
-        assert_eq!(app.selected, primary);
-        assert_eq!(app.scenario_context(), context);
-        assert!(app.camera_boundary() == camera);
-        assert_eq!(
-            (
-                app.behavior.scenario.spacing_stamp(),
-                app.behavior.scenario.spacing_token()
-            ),
-            spacing
-        );
-        if preserve_status {
-            assert_eq!(app.status, status);
-        }
-    }
-}
-fn packet(event: selection::Event) -> Message {
-    Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(event)))
-}
-
-#[test]
-fn exact_scenario_membership_primary_and_noops_preserve_model_source_and_history() {
-    for saved in [false, true] {
-        let (mut app, owner, diagram, lane, message) = setup(saved);
-        let model = app.project().clone();
-        let bundle = app.document.bundle().clone();
-        let revision = app.document.revision();
-        choose(&mut app, message, multiselect::Choice::Add);
-        choose(&mut app, lane, multiselect::Choice::Add);
-        choose(&mut app, message, multiselect::Choice::Inspect);
-        let snapshot = app.multiselect_snapshot().unwrap();
-        assert_eq!(
-            snapshot.targets(),
-            &[
-                Target::ScenarioObject(message),
-                Target::ScenarioObject(lane)
-            ]
-        );
-        assert_eq!(snapshot.primary(), Some(&Target::ScenarioObject(message)));
-        assert_eq!(
-            snapshot.context().scope.surface,
-            if saved {
-                Surface::Saved(diagram)
-            } else {
-                Surface::Scenario(owner)
-            }
-        );
-        assert_eq!(app.selected, message);
-        let repeated = capture(
-            &app,
-            Intent::Choose(Target::ScenarioObject(message), multiselect::Choice::Add),
-        );
-        inert(&mut app, vec![packet(repeated)], true);
-        let stale_collapse = capture(&app, Intent::Collapse(Target::ScenarioObject(lane)));
-        choose(&mut app, lane, multiselect::Choice::Remove);
-        choose(&mut app, lane, multiselect::Choice::Add);
-        choose(&mut app, message, multiselect::Choice::Inspect);
-        assert_eq!(
-            app.multiselect_snapshot().unwrap().targets(),
-            snapshot.targets()
-        );
-        assert_eq!(
-            app.multiselect_snapshot().unwrap().primary(),
-            snapshot.primary()
-        );
-        inert(&mut app, vec![packet(stale_collapse)], true);
-        assert_eq!(app.project(), &model);
-        assert_eq!(app.document.bundle(), &bundle);
-        assert_eq!(app.document.revision(), revision);
-        assert!(!app.document.can_undo() && !app.document.can_redo());
-    }
-}
-
-#[test]
-fn same_owner_representation_round_trip_clears_group_and_rejects_old_packets() {
-    let (mut app, owner, diagram, lane, message) = setup(true);
-    choose(&mut app, message, multiselect::Choice::Add);
-    choose(&mut app, lane, multiselect::Choice::Add);
-    let old = capture(&app, Intent::Clear);
-    let snapshot = app.multiselect_snapshot().unwrap();
-    let mut second = app.project().diagrams[&diagram].clone();
-    let other = Id::new_v4();
-    second.id = other;
-    second.alias = "other_saved".into();
-    second.name = "Other saved".into();
-    // Navigation itself is tested against a model with both saved identities.
-    let mut project = app.project().clone();
-    project.diagrams.insert(other, second);
-    let mut app = App::with_project(project);
-    let _ = app.update(Message::Select(owner));
-    let _ = app.update(Message::Diagram(super::super::Choice {
-        id: diagram,
-        label: "A".into(),
-    }));
-    choose(&mut app, message, multiselect::Choice::Add);
-    choose(&mut app, lane, multiselect::Choice::Add);
-    let first = capture(&app, Intent::Clear);
-    let first_visit = first.context.visit;
-    for representation in [
-        Representation::Saved { diagram: other },
-        Representation::Derived { owner },
-        Representation::Saved { diagram },
-    ] {
-        let context = app.scenario_context().unwrap();
-        let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Representation(
-            context,
-            representation,
-        )));
-        assert!(app.multiselect_snapshot().unwrap().targets().len() <= 1);
-    }
-    assert_ne!(app.scenario_context().unwrap().visit, first_visit);
-    choose(&mut app, message, multiselect::Choice::Replace);
-    choose(&mut app, lane, multiselect::Choice::Add);
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        snapshot.targets()
-    );
-    inert(&mut app, vec![packet(first), packet(old)], true);
-}
-
-#[test]
-fn unsupported_targets_and_bare_generic_packets_are_inert_before_side_effects() {
-    let (mut app, _, _, lane, message) = setup(true);
-    choose(&mut app, message, multiselect::Choice::Add);
-    choose(&mut app, lane, multiselect::Choice::Add);
-    let current = app.multiselect_context().unwrap();
-    let events = [
-        Target::Whole,
-        Target::Placement(message),
-        Target::ScenarioObject(Id::new_v4()),
-    ]
-    .into_iter()
-    .map(|target| {
-        packet(capture(
-            &app,
-            Intent::Choose(target, multiselect::Choice::Replace),
-        ))
-    })
-    .chain([
-        Message::DiagramSelection(multiselect::Event::Clear(current)),
-        Message::DiagramSelection(multiselect::Event::Choose(
-            current,
-            Target::ScenarioObject(message),
-            multiselect::Choice::Replace,
-        )),
-    ])
-    .collect();
-    inert(&mut app, events, true);
-}
-
-#[test]
-fn group_rejects_legacy_singleton_remove_reorder_and_index_arrows() {
-    let (mut app, owner, _, lane, message) = setup(true);
-    choose(&mut app, message, multiselect::Choice::Add);
-    choose(&mut app, lane, multiselect::Choice::Add);
-    let context = app.scenario_context().unwrap();
-    inert(
-        &mut app,
-        vec![
-            Message::ScenarioCanvas(CanvasEvent::Select(context, message)),
-            Message::ScenarioCanvas(CanvasEvent::Remove(context, lane)),
-            Message::ScenarioCanvas(CanvasEvent::Reorder {
-                context,
-                occurrence: message,
-                slot: scenario::Slot {
-                    parent: owner,
-                    before: None,
-                },
-            }),
-            Message::Command(Command::MoveStep(owner, 0, 1)),
-            Message::Delete,
-        ],
-        false,
-    );
-    assert!(!app.delete_pending);
-}
-
-#[test]
-fn secondary_selection_aba_retires_old_spacing_without_canceling_a_new_gesture() {
-    let (mut app, _, _, lane, message) = setup(true);
-    choose(&mut app, message, multiselect::Choice::Add);
-    let old = super::super::scenario_spacing::tests::packet_for_app(
-        &app,
-        spacing::Target::Message(message),
-    );
-    choose(&mut app, lane, multiselect::Choice::Add);
-    let group_begin = super::super::scenario_spacing::tests::packet_for_app(
-        &app,
-        spacing::Target::Message(message),
-    );
-    let original = app.document.snapshot();
-    let selected = app.multiselect_snapshot().unwrap();
-    let epoch = app.canvas_epoch;
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Spacing(group_begin)));
-    assert_eq!(app.project(), &original.decoded.project);
-    assert_eq!(app.document.bundle(), &original.bundle);
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        selected.targets()
-    );
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().primary(),
-        selected.primary()
-    );
-    assert_eq!(
-        app.canvas_epoch, epoch,
-        "pending click retains its admitted lifetime"
-    );
-    assert_eq!(
-        app.behavior.scenario.spacing_token(),
-        Some(group_begin.token())
-    );
-    choose(&mut app, lane, multiselect::Choice::Remove);
-    assert!(app.behavior.scenario.spacing_token().is_none());
-    inert(
-        &mut app,
-        vec![Message::ScenarioCanvas(CanvasEvent::Spacing(old))],
-        true,
-    );
-    let current = super::super::scenario_spacing::tests::packet_for_app(
-        &app,
-        spacing::Target::Message(message),
-    );
-    let spacing::Event::Begin { press_screen, .. } = current else {
-        unreachable!()
-    };
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Spacing(current)));
-    assert_eq!(app.behavior.scenario.spacing_token(), Some(current.token()));
-    inert(
-        &mut app,
-        vec![
-            Message::ScenarioCanvas(CanvasEvent::Spacing(old)),
-            Message::ScenarioCanvas(CanvasEvent::Spacing(spacing::Event::Cancel {
-                stamp: old.stamp(),
-                token: old.token(),
-            })),
-            Message::ScenarioCanvas(CanvasEvent::Spacing(spacing::Event::Finish {
-                stamp: old.stamp(),
-                token: old.token(),
-                screen: press_screen + Vector::new(0., 25.),
-            })),
-        ],
-        true,
-    );
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Spacing(
-        spacing::Event::Finish {
-            stamp: current.stamp(),
-            token: current.token(),
-            screen: press_screen + Vector::new(0., 25.),
-        },
-    )));
-    assert!(app.document.can_undo());
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        &[Target::ScenarioObject(message)]
-    );
-}
-
-#[test]
-fn legacy_singleton_selection_aba_retires_old_spacing_begin() {
-    for canvas in [false, true] {
-        let (mut app, _, _, lane, message) = setup(true);
-        choose(&mut app, message, multiselect::Choice::Add);
-        let old = super::super::scenario_spacing::tests::packet_for_app(
-            &app,
-            spacing::Target::Message(message),
-        );
-        for id in [lane, message] {
-            let event = if canvas {
-                Message::ScenarioCanvas(CanvasEvent::Select(app.scenario_context().unwrap(), id))
-            } else {
-                Message::Select(id)
-            };
-            let _ = app.update(event);
-            assert_eq!(app.selected, id);
-            assert_eq!(
-                app.multiselect_snapshot().unwrap().targets(),
-                &[Target::ScenarioObject(id)]
-            );
-        }
-        assert_ne!(app.scenario_context().unwrap(), old.stamp().context);
-        inert(
-            &mut app,
-            vec![Message::ScenarioCanvas(CanvasEvent::Spacing(old))],
-            true,
-        );
-        let current = super::super::scenario_spacing::tests::packet_for_app(
-            &app,
-            spacing::Target::Message(message),
-        );
-        let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Spacing(current)));
-        assert_eq!(app.behavior.scenario.spacing_token(), Some(current.token()));
-    }
-}
-
-#[test]
-fn pending_primary_edit_is_not_applied_by_selection_input() {
-    let (mut app, _, _, lane, message) = setup(true);
-    choose(&mut app, message, multiselect::Choice::Add);
-    let _ = app.update(Message::Field(
-        "/name".into(),
-        "Pending primary name".into(),
-    ));
-    assert!(app.draft_dirty());
-    let event = capture(
-        &app,
-        Intent::Choose(Target::ScenarioObject(lane), multiselect::Choice::Add),
-    );
-    inert(&mut app, vec![packet(event)], false);
-    assert!(app.draft_dirty());
-    assert_ne!(app.project().named(message), "Pending primary name");
-}

crates/oa-desktop/src/app/scenario_removal.rs

@@ -1,213 +0,0 @@
-//! One captured Scenario selection, one impact review, one document transaction.
-use super::*;
-use crate::behavior::scenario::{self, group_removal, selection};
-use crate::diagram_selection::Snapshot;
-use crate::diagram_usage::Target;
-use crate::model_menu;
-
-#[cfg(test)]
-mod tests;
-pub(crate) mod view;
-
-#[derive(Debug, Clone)]
-pub(crate) enum Event {
-    Begin {
-        context: scenario::Context,
-        snapshot: Box<Snapshot>,
-    },
-    Query {
-        token: u64,
-        query: String,
-    },
-    Page {
-        token: u64,
-        page: usize,
-    },
-    Cancel {
-        token: u64,
-    },
-}
-
-pub(crate) struct Review {
-    pub(crate) context: scenario::Context,
-    pub(crate) snapshot: Snapshot,
-    pub(crate) plan: group_removal::Plan,
-    pub(crate) query: String,
-    pub(crate) page: usize,
-}
-
-pub(crate) fn begin(app: &App) -> Option<Message> {
-    let context = app.scenario_context()?;
-    let snapshot = app.multiselect_snapshot()?;
-    (snapshot.targets().len() > 1).then_some(Message::ScenarioRemoval(Box::new(Event::Begin {
-        context,
-        snapshot: Box::new(snapshot),
-    })))
-}
-
-impl App {
-    pub(crate) fn scenario_removal_enabled(&self) -> bool {
-        self.scenario_reorder_enabled() && self.scenario_reorder.session.is_none()
-    }
-
-    fn scenario_removal_matches(&self, context: scenario::Context, snapshot: &Snapshot) -> bool {
-        if self.scenario_context() != Some(context)
-            || !self
-                .diagram_selection
-                .as_ref()
-                .is_some_and(|selected| selected.matches(snapshot, selection::context(context)))
-        {
-            return false;
-        }
-        let visible = selection::visible(self.project(), context, self.selected);
-        snapshot
-            .targets()
-            .iter()
-            .all(|target| visible.contains(target))
-    }
-
-    pub(super) fn scenario_removal_event(&mut self, event: Event) -> Task<Message> {
-        match event {
-            Event::Begin { context, snapshot } => {
-                // Admission precedes every shared input/selection boundary. A
-                // stale packet must not prune the set or retire a newer editor.
-                if !self.scenario_removal_matches(context, &snapshot)
-                    || !self.scenario_removal_enabled()
-                    || snapshot.targets().len() < 2
-                {
-                    return Task::none();
-                }
-                let plan = match group_removal::prepare(
-                    self.project(),
-                    context.scenario,
-                    snapshot.targets(),
-                ) {
-                    Ok(plan) => plan,
-                    Err(reason) => {
-                        self.status = reason;
-                        return Task::none();
-                    }
-                };
-                let Some(Target::ScenarioObject(primary)) = snapshot.primary() else {
-                    return Task::none();
-                };
-                let primary = *primary;
-                self.scenario_reorder_cancel();
-                self.source_interaction();
-                self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-                let context = self.scenario_context().expect("admitted Scenario");
-                let snapshot = self.multiselect_snapshot().expect("admitted selection");
-                let mut request = model_menu::Request::object(primary, iced::Point::ORIGIN);
-                request.scenario = Some(Box::new(context));
-                request.selection_target = Some(Box::new(Target::ScenarioObject(primary)));
-                self.menu_sequence = self.menu_sequence.wrapping_add(1);
-                self.delete_target = model_menu::Opened::new(self, request, self.menu_sequence)
-                    .map(|opened| diagram_removal::Confirmation {
-                        snapshot: opened,
-                        selection: self.selected,
-                        placement: None,
-                        behavior_owner: Some(context.scenario),
-                        process: None,
-                        saved: None,
-                        scenario: Some(Review {
-                            context,
-                            snapshot,
-                            plan,
-                            query: String::new(),
-                            page: 0,
-                        }),
-                    });
-                self.delete_pending = self.delete_target.is_some();
-            }
-            Event::Query { token, query } => {
-                if let Some(target) = self
-                    .delete_target
-                    .as_mut()
-                    .filter(|target| target.snapshot.token == token)
-                    && let Some(review) = target.scenario.as_mut()
-                {
-                    review.query = query;
-                    review.page = 0;
-                }
-            }
-            Event::Page { token, page } => {
-                if let Some(target) = self
-                    .delete_target
-                    .as_mut()
-                    .filter(|target| target.snapshot.token == token)
-                    && let Some(review) = target.scenario.as_mut()
-                {
-                    review.page = page;
-                }
-            }
-            Event::Cancel { token } => {
-                if self.delete_target.as_ref().is_some_and(|target| {
-                    target.snapshot.token == token && target.scenario.is_some()
-                }) {
-                    self.delete_target = None;
-                    self.delete_pending = false;
-                    self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-                    self.status = "Removal cancelled. Model and selection unchanged.".into();
-                }
-            }
-        }
-        Task::none()
-    }
-
-    pub(crate) fn scenario_removal_review_valid(
-        &self,
-        target: &diagram_removal::Confirmation,
-    ) -> bool {
-        let Some(review) = &target.scenario else {
-            return false;
-        };
-        self.delete_pending
-            && !self.busy
-            && target.snapshot.valid(self)
-            && self.scenario_removal_matches(review.context, &review.snapshot)
-            && self.selected == target.selection
-            && !self.source_dirty()
-            && !self.draft_dirty()
-            && !self.behavior.has_pending()
-            && !self.source_rename.open()
-            && self.scenario_reorder.session.is_none()
-            && self.behavior.scenario.spacing_token().is_none()
-            && self.behavior.scenario.canvas_tool(review.context.scenario)
-                == scenario::CanvasTool::Select
-    }
-
-    pub(super) fn confirm_scenario_removal(&mut self, token: u64) {
-        let Some(target) = self
-            .delete_target
-            .as_ref()
-            .filter(|target| target.snapshot.token == token && target.scenario.is_some())
-        else {
-            return;
-        };
-        let valid = self.scenario_removal_review_valid(target);
-        let target = self.delete_target.take().expect("captured review");
-        self.delete_pending = false;
-        self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-        if !valid {
-            self.status =
-                "Removal review expired. Nothing was removed; review the current selection again."
-                    .into();
-            return;
-        }
-        let review = target.scenario.expect("Scenario review");
-        match self.document.execute(review.plan.command) {
-            Ok(_) => {
-                self.selected = review.context.scenario;
-                self.selected_node = None;
-                self.behavior.active_owner = Some(review.context.scenario);
-                self.sync();
-                self.reconcile_multiselect();
-                self.status = format!(
-                    "Removed {} selected Scenario objects in one change. Referenced definitions preserved. Undo restores the model.",
-                    review.snapshot.targets().len()
-                );
-            }
-            Err(error) => self.status = format!("Nothing removed: {error}"),
-        }
-    }
-}

crates/oa-desktop/src/app/scenario_removal/tests.rs

@@ -1,758 +0,0 @@
-use super::*;
-use crate::behavior::scenario::{CanvasEvent, direct_tests};
-use crate::behavior::scenario_layout::Representation;
-use oa_core::{Diagram, DiagramLayout, Layer, OccurrenceBody, ProjectionKind, ScenarioLayout};
-
-struct Fixture {
-    app: App,
-    owner: Id,
-    call: Id,
-    reply: Id,
-    tail: Id,
-    exchange: Id,
-}
-
-fn setup(saved: bool) -> Fixture {
-    let f = direct_tests::fixture();
-    let mut project = f.project;
-    let mut tail = project
-        .make_element(
-            Kind::Occurrence,
-            Layer::Oa,
-            "Unselected tail",
-            Some(f.owner),
-        )
-        .unwrap();
-    if let Some(SharedBody::Occurrence { body, .. }) = tail.shared_mut() {
-        *body = OccurrenceBody::Action {
-            action: None,
-            lifeline: None,
-        };
-    }
-    let tail_id = tail.id;
-    project.elements.insert(tail_id, tail);
-    project
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(tail_id);
-    let diagram = Id::new_v4();
-    project.diagrams.insert(
-        diagram,
-        Diagram {
-            id: diagram,
-            alias: "removal_view".into(),
-            name: "Removal view".into(),
-            description: "Preserved authored view".into(),
-            layer: Layer::Oa,
-            projection: ProjectionKind::Scenario { scenario: f.owner },
-            nodes: Default::default(),
-            routes: vec![],
-            view_options: Default::default(),
-            layout: Some(DiagramLayout::Scenario(ScenarioLayout::default())),
-        },
-    );
-    let other = project
-        .make_element(Kind::Scenario, Layer::Oa, "Unrelated Scenario", None)
-        .unwrap();
-    let other_owner = other.id;
-    project.elements.insert(other_owner, other);
-    let mut other_view = project.diagrams[&diagram].clone();
-    other_view.id = Id::new_v4();
-    other_view.alias = "unrelated_removal_view".into();
-    other_view.name = "Unrelated saved view".into();
-    other_view.projection = ProjectionKind::Scenario {
-        scenario: other_owner,
-    };
-    project.diagrams.insert(other_view.id, other_view);
-    let mut app = App::with_project(project);
-    let _ = app.update(Message::Select(f.owner));
-    let _ = app.update(if saved {
-        Message::Diagram(Choice {
-            id: diagram,
-            label: "Saved".into(),
-        })
-    } else {
-        Message::Page(Page::Behavior)
-    });
-    // Deliberately reverse semantic order; the primary is call, not the last step.
-    for (id, choice) in [
-        (f.reply, multiselect::Choice::Replace),
-        (f.call, multiselect::Choice::Add),
-    ] {
-        let event = selection::Event {
-            context: app.scenario_context().unwrap(),
-            snapshot: app.multiselect_snapshot().unwrap(),
-            intent: selection::Intent::Choose(Target::ScenarioObject(id), choice),
-        };
-        let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(
-            event,
-        ))));
-    }
-    app.window_size = iced::Size::new(1600., 1000.);
-    let context = app.scenario_context().unwrap();
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Viewport(
-        context,
-        iced::Size::new(900., 600.),
-    )));
-    assert!(app.scenario_removal_enabled());
-    Fixture {
-        app,
-        owner: f.owner,
-        call: f.call,
-        reply: f.reply,
-        tail: tail_id,
-        exchange: f.exchange,
-    }
-}
-
-fn send(app: &mut App, event: Event) {
-    let _ = app.update(Message::ScenarioRemoval(Box::new(event)));
-}
-fn captured(app: &App) -> Event {
-    Event::Begin {
-        context: app.scenario_context().unwrap(),
-        snapshot: Box::new(app.multiselect_snapshot().unwrap()),
-    }
-}
-fn open(app: &mut App) -> u64 {
-    let event = captured(app);
-    send(app, event);
-    let target = app
-        .delete_target
-        .as_ref()
-        .expect("whole-selection review opened");
-    assert!(app.delete_pending && target.scenario.is_some());
-    assert!(
-        target.snapshot.valid(app),
-        "review captures refreshed modal epoch"
-    );
-    target.snapshot.token
-}
-
-#[test]
-fn scenario_group_removal_is_one_exact_model_source_transaction_in_both_representations() {
-    for saved in [false, true] {
-        let Fixture {
-            mut app,
-            owner,
-            call,
-            reply,
-            tail,
-            exchange,
-        } = setup(saved);
-        let baseline = app.document.snapshot();
-        let selected = app.multiselect_snapshot().unwrap();
-        let camera = app.behavior.scenario.camera_boundary();
-        let token = open(&mut app);
-        let review = app
-            .delete_target
-            .as_ref()
-            .unwrap()
-            .scenario
-            .as_ref()
-            .unwrap();
-        assert_eq!(review.snapshot.targets(), selected.targets());
-        assert_eq!(review.snapshot.primary(), selected.primary());
-        assert_eq!(review.plan.removed, [call, reply].into_iter().collect());
-        assert!(review.plan.changed.contains(&owner));
-        assert!(!review.plan.removed.contains(&exchange));
-        assert_eq!(app.document.bundle(), &baseline.bundle);
-        assert!(!app.document.can_undo());
-        let _ = app.update(Message::ConfirmDelete(token));
-        let mut expected = baseline.decoded.project.clone();
-        expected.elements.remove(&call);
-        expected.elements.remove(&reply);
-        *expected
-            .elements
-            .get_mut(&owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap() = vec![tail];
-        assert_eq!(app.project(), &expected);
-        assert!(app.project().contains(exchange));
-        assert!(!app.delete_pending && app.delete_target.is_none());
-        assert!(app.multiselect_snapshot().unwrap().targets().is_empty());
-        assert!(app.behavior.scenario.camera_boundary() == camera);
-        let removed = app.document.bundle().clone();
-        assert_ne!(removed, baseline.bundle);
-        let reopened = Document::from_bundle(removed.clone(), Default::default()).unwrap();
-        assert_eq!(reopened.project(), &expected);
-        let _ = app.update(Message::ConfirmDelete(token));
-        assert_eq!(app.document.bundle(), &removed);
-        let _ = app.update(Message::Undo);
-        assert_eq!(app.project(), &baseline.decoded.project);
-        assert_eq!(app.document.bundle(), &baseline.bundle);
-        assert!(
-            !app.document.can_undo(),
-            "one Undo restores the entire group"
-        );
-        let _ = app.update(Message::Redo);
-        assert_eq!(app.document.bundle(), &removed);
-        assert_eq!(app.project(), &expected);
-    }
-}
-
-#[test]
-fn scenario_group_removal_source_write_failure_preserves_snapshot_selection_camera_and_redo() {
-    use oa_core::source_project::{self, ProjectLimits};
-
-    let mut project = Project::empty();
-    let owner = project
-        .add_element(Kind::Scenario, Layer::Oa, "Conversation", None)
-        .unwrap();
-    let lanes = ["a", "b"].map(|alias| {
-        let id = project
-            .add_element(Kind::Lifeline, Layer::Oa, alias, Some(owner))
-            .unwrap();
-        project.elements.get_mut(&id).unwrap().alias = alias.into();
-        id
-    });
-    let mut messages = Vec::new();
-    for index in 0..256 {
-        let mut message = project
-            .make_element(
-                Kind::Occurrence,
-                Layer::Oa,
-                &format!("Message {index}"),
-                Some(owner),
-            )
-            .unwrap();
-        let SharedBody::Occurrence { body, .. } = message.shared_mut().unwrap() else {
-            panic!("message occurrence");
-        };
-        *body = OccurrenceBody::Exchange {
-            exchange: None,
-            sender: Some(lanes[0]),
-            receiver: Some(lanes[1]),
-            message_kind: oa_core::MessageKind::Asynchronous,
-            reply_to: None,
-            values: vec![],
-            operation: None,
-        };
-        messages.push(message.id);
-        project.elements.insert(message.id, message);
-    }
-    *project
-        .elements
-        .get_mut(&owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap() = messages.clone();
-    let diagram = Id::new_v4();
-    project.diagrams.insert(
-        diagram,
-        Diagram {
-            id: diagram,
-            alias: "removal_view".into(),
-            name: "Removal view".into(),
-            description: String::new(),
-            layer: Layer::Oa,
-            projection: ProjectionKind::Scenario { scenario: owner },
-            view_options: Default::default(),
-            nodes: Default::default(),
-            routes: vec![],
-            layout: Some(DiagramLayout::Scenario(ScenarioLayout::default())),
-        },
-    );
-    oa_core::validate_candidate(&project).unwrap();
-    let bundle = source_project::format_bundle(&project);
-    let bytes = |bundle: &source_project::SourceBundle| {
-        bundle.files.values().map(String::len).sum::<usize>()
-    };
-    let targets = lanes.map(Target::ScenarioObject);
-    let plan = group_removal::prepare(&project, owner, &targets).unwrap();
-    assert_eq!(plan.removed, lanes.into_iter().collect());
-    let mut expected = project.clone();
-    for lane in lanes {
-        expected.elements.remove(&lane);
-    }
-    for id in &messages {
-        let SharedBody::Occurrence {
-            body: OccurrenceBody::Exchange {
-                sender, receiver, ..
-            },
-            ..
-        } = expected.elements.get_mut(id).unwrap().shared_mut().unwrap()
-        else {
-            panic!("surviving message");
-        };
-        *sender = None;
-        *receiver = None;
-    }
-    oa_core::validate_candidate(&expected).unwrap();
-    let mut unrestricted = Document::from_bundle(bundle.clone(), Default::default()).unwrap();
-    unrestricted.execute(plan.command.clone()).unwrap();
-    assert_eq!(unrestricted.project(), &expected);
-    // Removal can grow losslessly edited source: each authored @a/@b becomes
-    // explicit none in a surviving message. Prove net growth after deletion,
-    // rather than assuming a budget failure or changing private Document limits.
-    assert!(bytes(unrestricted.bundle()) > bytes(&bundle));
-    let mut limits = ProjectLimits::default();
-    limits.model.max_source_bytes = bytes(&bundle);
-    let mut bounded = Document::from_bundle(bundle.clone(), limits).unwrap();
-    let error = bounded.execute(plan.command).unwrap_err();
-    assert!(
-        error
-            .diagnostics()
-            .iter()
-            .any(|diagnostic| diagnostic.diagnostic.code == "source_limit")
-    );
-    let refusal = format!("Nothing removed: {error}");
-
-    for saved in [false, true] {
-        for with_redo in [false, true] {
-            let mut app = App::with_project(project.clone());
-            app.document = Document::from_bundle(bundle.clone(), limits).unwrap();
-            let redo = if with_redo {
-                // A genuine earlier rename fits the same budget. Undo leaves
-                // its exact model/source snapshot available before this review.
-                app.document
-                    .execute(Command::Rename(owner, "Short".into()))
-                    .unwrap();
-                let future = app.document.snapshot();
-                assert!(app.document.undo());
-                Some(future)
-            } else {
-                None
-            };
-            app.sync();
-            let _ = app.update(Message::Select(owner));
-            let _ = app.update(if saved {
-                Message::Diagram(Choice {
-                    id: diagram,
-                    label: "Saved".into(),
-                })
-            } else {
-                Message::Page(Page::Behavior)
-            });
-            for (id, choice) in [
-                (lanes[1], multiselect::Choice::Replace),
-                (lanes[0], multiselect::Choice::Add),
-            ] {
-                let event = selection::Event {
-                    context: app.scenario_context().unwrap(),
-                    snapshot: app.multiselect_snapshot().unwrap(),
-                    intent: selection::Intent::Choose(Target::ScenarioObject(id), choice),
-                };
-                let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(
-                    event,
-                ))));
-            }
-            app.window_size = iced::Size::new(1600., 1000.);
-            let context = app.scenario_context().unwrap();
-            let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Viewport(
-                context,
-                iced::Size::new(900., 600.),
-            )));
-            assert!(app.scenario_removal_enabled());
-            let baseline = app.document.snapshot();
-            let revision = app.document.revision();
-            let selected = app.multiselect_snapshot().unwrap();
-            assert_eq!(
-                selected.targets(),
-                &[targets[1].clone(), targets[0].clone()]
-            );
-            let context = app.scenario_context().unwrap();
-            let camera = app.behavior.scenario.camera_boundary();
-            let navigation = (
-                app.page,
-                app.active_diagram,
-                app.selected,
-                app.selected_node,
-                app.behavior.active_owner,
-            );
-            let editor = app.source_editor.text();
-            assert!(!app.document.dirty() && !app.document.can_undo());
-            assert_eq!(app.document.can_redo(), with_redo);
-            let token = open(&mut app);
-            let review = app.delete_target.as_ref().unwrap();
-            assert!(app.scenario_removal_review_valid(review));
-            assert_eq!(review.scenario.as_ref().unwrap().plan.removed, plan.removed);
-            let epoch = app.canvas_epoch;
-            let _ = app.update(Message::ConfirmDelete(token));
-            assert_eq!(app.status, refusal);
-            assert!(!app.delete_pending && app.delete_target.is_none());
-            assert_ne!(app.canvas_epoch, epoch, "failed confirmation retires input");
-            assert!(std::sync::Arc::ptr_eq(&baseline, &app.document.snapshot()));
-            assert_eq!(app.project(), &baseline.decoded.project);
-            assert_eq!(app.document.bundle(), &baseline.bundle);
-            assert_eq!(app.document.revision(), revision);
-            assert!(!app.document.dirty() && !app.document.can_undo());
-            assert_eq!(app.document.can_redo(), with_redo);
-            let retained = app.multiselect_snapshot().unwrap();
-            assert_eq!(retained.targets(), selected.targets());
-            assert_eq!(retained.primary(), selected.primary());
-            assert_eq!(retained.generation(), selected.generation());
-            let after = app.scenario_context().unwrap();
-            assert_eq!(after.document, context.document);
-            assert_eq!(after.revision, context.revision);
-            assert_eq!(after.representation, context.representation);
-            assert_eq!(after.visit, context.visit);
-            assert!(app.behavior.scenario.camera_boundary() == camera);
-            assert_eq!(
-                (
-                    app.page,
-                    app.active_diagram,
-                    app.selected,
-                    app.selected_node,
-                    app.behavior.active_owner,
-                ),
-                navigation
-            );
-            assert_eq!(app.source_editor.text(), editor);
-            assert_eq!(app.source_workspace.bundle(), baseline.bundle);
-            assert!(!app.source_dirty() && !app.draft_dirty());
-            let epoch = app.canvas_epoch;
-            let _ = app.update(Message::ConfirmDelete(token));
-            assert_eq!(app.canvas_epoch, epoch);
-            assert_eq!(app.multiselect_snapshot().unwrap(), retained);
-            assert_eq!(app.status, refusal);
-            assert!(std::sync::Arc::ptr_eq(&baseline, &app.document.snapshot()));
-            if let Some(future) = redo {
-                let _ = app.update(Message::Redo);
-                assert_eq!(app.project(), &future.decoded.project);
-                assert_eq!(app.document.bundle(), &future.bundle);
-                assert!(!app.document.can_redo());
-                let _ = app.update(Message::Undo);
-                assert_eq!(app.project(), &baseline.decoded.project);
-                assert_eq!(app.document.bundle(), &baseline.bundle);
-                assert!(!app.document.can_undo() && !app.document.dirty());
-            }
-        }
-    }
-}
-
-#[test]
-fn scenario_group_removal_old_modal_packets_do_not_touch_the_new_review() {
-    let mut f = setup(true);
-    let old_begin = captured(&f.app);
-    let first = open(&mut f.app);
-    send(&mut f.app, Event::Cancel { token: first });
-    let second = open(&mut f.app);
-    assert_ne!(first, second);
-    let epoch = f.app.canvas_epoch;
-    let selected = f.app.multiselect_snapshot().unwrap();
-    let source = f.app.document.bundle().clone();
-    for message in [
-        Message::ScenarioRemoval(Box::new(old_begin)),
-        Message::ScenarioRemoval(Box::new(Event::Cancel { token: first })),
-        Message::ScenarioRemoval(Box::new(Event::Query {
-            token: first,
-            query: "stale".into(),
-        })),
-        Message::ScenarioRemoval(Box::new(Event::Page {
-            token: first,
-            page: 99,
-        })),
-        Message::ConfirmDelete(first),
-        Message::CancelDelete,
-    ] {
-        let _ = f.app.update(message);
-        let target = f.app.delete_target.as_ref().unwrap();
-        assert_eq!(target.snapshot.token, second);
-        assert!(target.scenario.as_ref().unwrap().query.is_empty());
-        assert_eq!(target.scenario.as_ref().unwrap().page, 0);
-        assert_eq!(f.app.canvas_epoch, epoch);
-        assert_eq!(f.app.multiselect_snapshot().unwrap(), selected);
-        assert_eq!(f.app.document.bundle(), &source);
-    }
-    send(
-        &mut f.app,
-        Event::Query {
-            token: second,
-            query: "reply".into(),
-        },
-    );
-    send(
-        &mut f.app,
-        Event::Page {
-            token: second,
-            page: 1,
-        },
-    );
-    assert_eq!(f.app.canvas_epoch, epoch);
-    assert_eq!(f.app.document.bundle(), &source);
-    send(&mut f.app, Event::Cancel { token: second });
-    assert!(!f.app.delete_pending);
-    assert_eq!(
-        f.app.multiselect_snapshot().unwrap().targets(),
-        selected.targets()
-    );
-    assert_eq!(
-        f.app.multiselect_snapshot().unwrap().primary(),
-        selected.primary()
-    );
-    assert!(!f.app.document.can_undo());
-}
-
-#[test]
-fn scenario_group_removal_confirm_expires_for_each_context_or_selection_change() {
-    for change in 0..5 {
-        let mut f = setup(true);
-        let token = open(&mut f.app);
-        match change {
-            0 => f.app.canvas_document = Id::new_v4(),
-            1 => {
-                let context = f.app.scenario_context().unwrap();
-                let _ = f.app.update(Message::ScenarioCanvas(CanvasEvent::Viewport(
-                    context,
-                    iced::Size::new(900., 560.),
-                )));
-                assert_ne!(f.app.canvas_epoch, context.epoch);
-            }
-            2 => {
-                f.app
-                    .document
-                    .execute(Command::Rename(f.owner, "New revision".into()))
-                    .unwrap();
-            }
-            3 => {
-                let context = f.app.scenario_context().unwrap();
-                f.app.behavior.scenario.enter_representation(
-                    context.document,
-                    f.owner,
-                    Representation::Derived { owner: f.owner },
-                );
-                f.app.behavior.scenario.enter_representation(
-                    context.document,
-                    f.owner,
-                    context.representation,
-                );
-                assert_ne!(f.app.scenario_context().unwrap().visit, context.visit);
-            }
-            _ => {
-                let selected = f.app.diagram_selection.as_mut().unwrap();
-                assert!(selected.set_primary(&Target::ScenarioObject(f.reply)));
-                assert!(selected.set_primary(&Target::ScenarioObject(f.call)));
-            }
-        }
-        let current = f.app.document.snapshot();
-        let _ = f.app.update(Message::ConfirmDelete(token));
-        assert_eq!(f.app.project(), &current.decoded.project);
-        assert_eq!(f.app.document.bundle(), &current.bundle);
-        assert!(!f.app.delete_pending && f.app.delete_target.is_none());
-        assert!(f.app.status.contains("expired"));
-    }
-}
-
-#[test]
-fn scenario_group_removal_cancel_preserves_existing_redo_and_full_selection() {
-    let mut f = setup(true);
-    let _ = f.app.update(Message::Command(Command::Rename(
-        f.tail,
-        "Redo remains available".into(),
-    )));
-    let renamed = f.app.document.bundle().clone();
-    let _ = f.app.update(Message::Undo);
-    assert!(f.app.document.can_redo());
-    // Rename inspects the renamed tail; Undo preserves that inspection. Restore
-    // the real group before testing cancellation of its removal review.
-    for (id, choice) in [
-        (f.reply, multiselect::Choice::Replace),
-        (f.call, multiselect::Choice::Add),
-    ] {
-        let event = selection::Event {
-            context: f.app.scenario_context().unwrap(),
-            snapshot: f.app.multiselect_snapshot().unwrap(),
-            intent: selection::Intent::Choose(Target::ScenarioObject(id), choice),
-        };
-        let _ = f
-            .app
-            .update(Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(
-                event,
-            ))));
-    }
-    let selected = f.app.multiselect_snapshot().unwrap();
-    assert_eq!(selected.targets().len(), 2);
-    assert!(f.app.document.can_redo());
-    let source = f.app.document.bundle().clone();
-    let token = open(&mut f.app);
-    send(&mut f.app, Event::Cancel { token });
-    assert_eq!(f.app.document.bundle(), &source);
-    assert_eq!(
-        f.app.multiselect_snapshot().unwrap().targets(),
-        selected.targets()
-    );
-    assert_eq!(
-        f.app.multiselect_snapshot().unwrap().primary(),
-        selected.primary()
-    );
-    assert!(f.app.document.can_redo() && !f.app.document.can_undo());
-    let _ = f.app.update(Message::Redo);
-    assert_eq!(f.app.document.bundle(), &renamed);
-}
-
-#[test]
-fn scenario_group_removal_does_not_retire_active_reorder_or_spacing() {
-    for spacing in [false, true] {
-        let mut f = setup(true);
-        if spacing {
-            let event = crate::app::scenario_spacing::tests::packet_for_app(
-                &f.app,
-                scenario::spacing::Target::Message(f.call),
-            );
-            let _ = f
-                .app
-                .update(Message::ScenarioCanvas(CanvasEvent::Spacing(event)));
-            assert!(f.app.behavior.scenario.spacing_token().is_some());
-        } else {
-            let event = crate::app::scenario_reorder::Event {
-                context: f.app.scenario_context().unwrap(),
-                snapshot: f.app.multiselect_snapshot().unwrap(),
-                token: Id::new_v4(),
-                intent: crate::app::scenario_reorder::Intent::Begin,
-            };
-            let _ = f.app.update(Message::ScenarioReorder(Box::new(event)));
-            assert!(f.app.scenario_reorder.session.is_some());
-        }
-        let epoch = f.app.canvas_epoch;
-        let spacing_token = f.app.behavior.scenario.spacing_token();
-        let reorder_token = f
-            .app
-            .scenario_reorder
-            .session
-            .as_ref()
-            .map(|session| session.token());
-        let source = f.app.document.bundle().clone();
-        let event = captured(&f.app);
-        send(&mut f.app, event);
-        assert!(f.app.delete_target.is_none());
-        assert_eq!(f.app.canvas_epoch, epoch);
-        assert_eq!(f.app.behavior.scenario.spacing_token(), spacing_token);
-        assert_eq!(
-            f.app
-                .scenario_reorder
-                .session
-                .as_ref()
-                .map(|session| session.token()),
-            reorder_token
-        );
-        assert_eq!(f.app.document.bundle(), &source);
-    }
-}
-
-#[test]
-fn scenario_group_removal_menu_does_not_select_its_clicked_subject() {
-    for unselected in [false, true] {
-        let mut f = setup(true);
-        let selection = f.app.multiselect_snapshot().unwrap();
-        let clicked = if unselected { f.tail } else { f.reply };
-        let mut request = model_menu::Request::object(clicked, iced::Point::ORIGIN);
-        request.scenario = f.app.scenario_context().map(Box::new);
-        request.selection_target = Some(Box::new(Target::ScenarioObject(clicked)));
-        let _ = f
-            .app
-            .update(Message::Menu(model_menu::Event::Open(request)));
-        let menu = f.app.model_menu.as_ref().expect("Scenario menu");
-        let token = menu.token;
-        let action = begin(&f.app).expect("captured group menu action");
-        let _ = f.app.update(Message::Menu(model_menu::Event::Invoke(
-            token,
-            Box::new(action),
-        )));
-        let review = f
-            .app
-            .delete_target
-            .as_ref()
-            .unwrap()
-            .scenario
-            .as_ref()
-            .unwrap();
-        assert_eq!(review.snapshot.targets(), selection.targets());
-        assert_eq!(review.snapshot.primary(), selection.primary());
-        assert_eq!(f.app.selected, f.call);
-        assert!(!review.plan.removed.contains(&f.tail));
-        assert!(f.app.project().contains(clicked));
-    }
-}
-
-#[test]
-fn scenario_group_removal_rejects_dirty_properties_and_legacy_singleton_messages() {
-    let mut f = setup(false);
-    let baseline = f.app.document.bundle().clone();
-    let selected = f.app.multiselect_snapshot().unwrap();
-    let epoch = f.app.canvas_epoch;
-    let _ = f.app.update(Message::Delete);
-    let _ = f.app.update(Message::ScenarioCanvas(CanvasEvent::Remove(
-        f.app.scenario_context().unwrap(),
-        f.call,
-    )));
-    assert!(f.app.delete_target.is_none());
-    assert_eq!(f.app.canvas_epoch, epoch);
-    assert_eq!(f.app.multiselect_snapshot().unwrap(), selected);
-    let _ = f.app.update(Message::Field(
-        "/name".into(),
-        "Unapplied group primary".into(),
-    ));
-    assert!(f.app.draft_dirty());
-    let event = captured(&f.app);
-    let epoch = f.app.canvas_epoch;
-    send(&mut f.app, event);
-    assert!(f.app.delete_target.is_none() && f.app.draft_dirty());
-    assert_eq!(f.app.canvas_epoch, epoch);
-    assert_eq!(f.app.document.bundle(), &baseline);
-    assert!(!f.app.document.can_undo());
-}
-
-#[tokio::test]
-async fn mounted_scenario_group_delete_captures_whole_set_and_repeat_does_not_confirm() {
-    use crate::behavior::canvas_workspace::tests::{Mounted, key};
-    use iced::{
-        keyboard::{self, key::Named},
-        mouse,
-    };
-    for shift in [false, true] {
-        let mut f = setup(true);
-        let mut mounted = Mounted::new(&mut f.app).await;
-        mounted
-            .batch(&mut f.app, &[key(Named::F6)], mouse::Cursor::Unavailable)
-            .await;
-        let selected = f.app.multiselect_snapshot().unwrap();
-        let source = f.app.document.bundle().clone();
-        let mut remove = key(Named::Delete);
-        if let iced::Event::Keyboard(keyboard::Event::KeyPressed { modifiers, .. }) = &mut remove {
-            *modifiers = if shift {
-                keyboard::Modifiers::SHIFT
-            } else {
-                keyboard::Modifiers::default()
-            };
-        }
-        let output = mounted
-            .batch(&mut f.app, &[remove.clone()], mouse::Cursor::Unavailable)
-            .await;
-        assert!(output.iter().any(|message| matches!(message, Message::ScenarioRemoval(event) if matches!(&**event, Event::Begin { snapshot, .. } if snapshot.targets()==selected.targets() && snapshot.primary()==selected.primary()))), "actual canvas Delete emits full captured group: {output:?}");
-        assert!(!output.iter().any(|message| matches!(
-            message,
-            Message::Delete | Message::ScenarioCanvas(CanvasEvent::Remove(..))
-        )));
-        let token = f
-            .app
-            .delete_target
-            .as_ref()
-            .expect("mounted group review")
-            .snapshot
-            .token;
-        if let iced::Event::Keyboard(keyboard::Event::KeyPressed { repeat, .. }) = &mut remove {
-            *repeat = true;
-        }
-        let output = mounted
-            .batch(&mut f.app, &[remove], mouse::Cursor::Unavailable)
-            .await;
-        assert!(
-            !output
-                .iter()
-                .any(|message| matches!(message, Message::ConfirmDelete(_)))
-        );
-        assert_eq!(f.app.delete_target.as_ref().unwrap().snapshot.token, token);
-        assert_eq!(f.app.document.bundle(), &source);
-        send(&mut f.app, Event::Cancel { token });
-        assert_eq!(
-            f.app.multiselect_snapshot().unwrap().targets(),
-            selected.targets()
-        );
-        assert!(!f.app.document.can_undo());
-    }
-}

crates/oa-desktop/src/app/scenario_removal/view.rs

@@ -1,155 +0,0 @@
-//! Review the complete captured removal impact before one explicit confirmation.
-use super::{Event, Review};
-use crate::app::{App, Message, diagram_removal};
-use crate::diagram_usage::Target;
-use crate::style;
-use iced::widget::{button, column, container, row, scrollable, text, text_input};
-use iced::{Element, Length::Fill};
-use oa_core::{Id, Project};
-use std::collections::BTreeMap;
-
-const PAGE_SIZE: usize = 6;
-
-struct ImpactRow {
-    label: String,
-    disposition: &'static str,
-}
-
-fn matching_rows(project: &Project, review: &Review) -> Vec<ImpactRow> {
-    let aliases: BTreeMap<Id, &str> = project.identities().into_iter().collect();
-    let query = review.query.trim().to_lowercase();
-    review
-        .plan
-        .removed
-        .iter()
-        .map(|id| {
-            let selected = review
-                .snapshot
-                .targets()
-                .contains(&Target::ScenarioObject(*id));
-            (
-                *id,
-                if selected {
-                    "Removed · selected"
-                } else {
-                    "Additional removed"
-                },
-            )
-        })
-        .chain(
-            review
-                .plan
-                .changed
-                .iter()
-                .map(|id| (*id, "Updated · preserved")),
-        )
-        .filter_map(|(id, disposition)| {
-            let name = project.named(id);
-            let identity = aliases
-                .get(&id)
-                .map_or_else(|| id.to_string(), |alias| format!("@{alias}"));
-            let label = if name == "Missing object" || name.is_empty() {
-                identity
-            } else {
-                format!("{name} ({identity})")
-            };
-            (query.is_empty()
-                || label.to_lowercase().contains(&query)
-                || id.to_string().contains(&query))
-            .then_some(ImpactRow { label, disposition })
-        })
-        .collect()
-}
-
-pub(crate) fn view<'a>(
-    app: &'a App,
-    target: &'a diagram_removal::Confirmation,
-) -> Element<'a, Message> {
-    let Some(review) = target.scenario.as_ref() else {
-        return text("Scenario removal review is unavailable.").into();
-    };
-    let token = target.snapshot.token;
-    let valid = app.scenario_removal_review_valid(target);
-    let rows = matching_rows(app.project(), review);
-    let pages = rows.len().div_ceil(PAGE_SIZE).max(1);
-    let page = review.page.min(pages - 1);
-    let mut impacts = column![].spacing(12).width(Fill);
-    for impact in rows.iter().skip(page * PAGE_SIZE).take(PAGE_SIZE) {
-        impacts = impacts.push(
-            column![
-                text(impact.disposition).size(12).color(style::MUTED),
-                text(impact.label.clone())
-                    .size(13)
-                    .width(Fill)
-                    .wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-            ]
-            .spacing(3)
-            .width(Fill),
-        );
-    }
-    if rows.is_empty() {
-        impacts = impacts.push(text("No matching affected records. Try a name or alias.").size(13));
-    }
-    let previous = button("Previous").on_press_maybe((page > 0).then(|| {
-        Message::ScenarioRemoval(Box::new(Event::Page {
-            token,
-            page: page - 1,
-        }))
-    }));
-    let next = button("Next").on_press_maybe((page + 1 < pages).then(|| {
-        Message::ScenarioRemoval(Box::new(Event::Page {
-            token,
-            page: page + 1,
-        }))
-    }));
-    let mut footer = column![].spacing(8).width(Fill);
-    if !valid {
-        footer = footer.push(
-            text("This review expired. Cancel and review the current selection again.")
-                .size(13)
-                .width(Fill)
-                .wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-        );
-    }
-    footer = footer.push(
-        row![
-            container(
-                button("Cancel")
-                    .padding(10)
-                    .on_press(Message::ScenarioRemoval(Box::new(Event::Cancel { token })))
-            )
-            .id("delete-cancel"),
-            container(
-                button("Remove from Scenario")
-                    .style(button::danger)
-                    .padding(10)
-                    .on_press_maybe(valid.then_some(Message::ConfirmDelete(token)))
-            )
-            .id("delete-confirm"),
-        ]
-        .spacing(10),
-    );
-    column![
-        text(format!("Remove {} Scenario objects?", review.snapshot.targets().len())).size(21),
-        text(format!("{} records removed · {} records updated", review.plan.removed.len(), review.plan.changed.len())).size(14),
-        text_input("Search affected names or aliases", &review.query)
-            .id("scenario-removal-query")
-            .on_input(move |query| Message::ScenarioRemoval(Box::new(Event::Query { token, query })))
-            .size(13),
-        row![previous, text(format!("Page {} of {} · {} matches", page + 1, pages, rows.len())).size(12), next]
-            .spacing(10).align_y(iced::Alignment::Center),
-        scrollable(column![
-            text("Removes local occurrences or participants and their owned descendants. Affected references are cleared; reusable definitions are preserved. Updated records include owning sequences and affected views. One Undo restores the entire change.")
-                .size(13).width(Fill).wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-            impacts,
-        ].spacing(14).width(Fill))
-            .width(Fill).height(Fill).spacing(8).id("scenario-removal-impact"),
-        footer,
-    ]
-    .spacing(12)
-    .width(Fill)
-    // At the reviewed 732px window height, 570px content plus the modal's
-    // 52px padding leaves 110px outside the card. Only the impact body flexes.
-    .height((app.window_size.height - 160.).clamp(260., 570.))
-    .into()
-}

crates/oa-desktop/src/app/scenario_reorder.rs

@@ -1,339 +0,0 @@
-//! Exact-input adapter for an explicit semantic reorder operation.
-use super::*;
-use crate::behavior::scenario_layout::presentation::PresentationStatus;
-use crate::{
-    behavior::scenario::{
-        self,
-        reorder_session::{Outcome, Session},
-        selection,
-    },
-    diagram_selection::Snapshot,
-};
-
-#[derive(Default)]
-pub(crate) struct State {
-    pub(crate) session: Option<Session>,
-    pub(crate) query: String,
-    pub(crate) page: usize,
-    pub(crate) summary: Option<(scenario::Context, String)>,
-    summary_selection: Option<Snapshot>,
-}
-
-#[derive(Debug, Clone)]
-pub(crate) struct Event {
-    pub(crate) context: scenario::Context,
-    pub(crate) snapshot: Snapshot,
-    pub(crate) token: Id,
-    pub(crate) intent: Intent,
-}
-#[derive(Debug, Clone)]
-pub(crate) enum Intent {
-    Begin,
-    Choose(scenario::Slot),
-    Query(String),
-    Page(usize),
-    Finish(scenario::Slot),
-    Cancel,
-}
-
-fn short_label(value: &str) -> String {
-    crate::views::short(value, 24)
-}
-
-/// Actual committed block order, independent of capture order or saved Y.
-fn result_neighborhood(project: &oa_core::Project, parent: Id, snapshot: &Snapshot) -> String {
-    let Some(order) = project
-        .elements
-        .get(&parent)
-        .and_then(|element| element.steps())
-    else {
-        return String::new();
-    };
-    let selected: Vec<_> = order
-        .iter()
-        .enumerate()
-        .filter(|(_, id)| {
-            snapshot
-                .targets()
-                .contains(&crate::diagram_usage::Target::ScenarioObject(**id))
-        })
-        .collect();
-    let Some((first, _)) = selected.first() else {
-        return String::new();
-    };
-    let last = selected.last().expect("nonempty block").0;
-    let label = |index: usize| format!("#{} @{}", index + 1, project.elements[&order[index]].alias);
-    let left = first
-        .checked_sub(1)
-        .map_or_else(|| "Start".to_owned(), label);
-    let right = if last + 1 < order.len() {
-        label(last + 1)
-    } else {
-        "End".to_owned()
-    };
-    let mut members = selected
-        .iter()
-        .take(3)
-        .map(|(index, _)| label(*index))
-        .collect::<Vec<_>>()
-        .join(", ");
-    if selected.len() > 3 {
-        members.push_str(&format!(", +{} more", selected.len() - 3));
-    }
-    format!("{left} → [{members}] → {right}")
-}
-
-impl App {
-    pub(crate) fn scenario_reorder_enabled(&self) -> bool {
-        self.spacing_enabled()
-            && diagram_removal::enabled(self)
-            && self.behavior.scenario.spacing_token().is_none()
-            && self.scenario_context().is_some_and(|context| {
-                self.behavior.scenario.canvas_tool(context.scenario) == scenario::CanvasTool::Select
-            })
-    }
-
-    pub(crate) fn scenario_reorder_cancel(&mut self) {
-        if self.scenario_reorder.session.take().is_some() {
-            self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-        }
-        self.scenario_reorder.query.clear();
-        self.scenario_reorder.page = 0;
-        self.scenario_reorder.summary = None;
-        self.scenario_reorder.summary_selection = None;
-    }
-
-    pub(crate) fn scenario_reorder_reconcile(&mut self) {
-        if self
-            .scenario_reorder
-            .summary
-            .as_ref()
-            .is_some_and(|(context, _)| {
-                // A committed result is presentation, not a live authoring packet.
-                // Resizing diagnostics or moving the camera retires input epochs
-                // without changing the result's document, view or selection.
-                let same_result = self.scenario_context().is_some_and(|mut current| {
-                    current.epoch = context.epoch;
-                    current == *context
-                });
-                let same_selection = self
-                    .scenario_reorder
-                    .summary_selection
-                    .as_ref()
-                    .zip(self.diagram_selection.as_ref())
-                    .is_some_and(|(snapshot, selected)| {
-                        selected.matches(snapshot, snapshot.context())
-                    });
-                !same_result || !same_selection
-            })
-        {
-            self.scenario_reorder.summary = None;
-            self.scenario_reorder.summary_selection = None;
-        }
-        let Some(session) = self.scenario_reorder.session.as_ref() else {
-            return;
-        };
-        let valid = self.scenario_reorder_enabled()
-            && self
-                .scenario_context()
-                .zip(self.multiselect_snapshot())
-                .is_some_and(|(context, snapshot)| {
-                    session.matches(self.project(), context, &snapshot, session.token())
-                });
-        if !valid {
-            self.scenario_reorder_cancel();
-        }
-    }
-
-    pub(crate) fn scenario_reorder_event(&mut self, event: Event) -> Task<Message> {
-        // Reject stale envelopes before touching any newer operation or UI state.
-        if event.token.is_nil()
-            || self.scenario_context() != Some(event.context)
-            || !self
-                .diagram_selection
-                .as_ref()
-                .is_some_and(|selection_state| {
-                    selection_state.matches(&event.snapshot, selection::context(event.context))
-                })
-        {
-            return Task::none();
-        }
-        if matches!(&event.intent, Intent::Begin) {
-            if self.scenario_reorder.session.is_some() || !self.scenario_reorder_enabled() {
-                return Task::none();
-            }
-            // Retire the captured Begin before construction, including failed starts.
-            self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-            let context = self.scenario_context().expect("admitted scenario");
-            let snapshot = self.multiselect_snapshot().expect("admitted selection");
-            self.scenario_reorder.query.clear();
-            self.scenario_reorder.page = 0;
-            self.scenario_reorder.summary = None;
-            self.scenario_reorder.summary_selection = None;
-            match Session::new(
-                self.document.snapshot().decoded.project.clone().into(),
-                context,
-                snapshot,
-                event.token,
-            ) {
-                Ok(session) => {
-                    self.scenario_reorder.session = Some(session);
-                    self.status = "Choose a semantic destination, then apply reorder. Saved positions are preserved.".into();
-                    return scenario::reorder_view::focus_query(event.token);
-                }
-                Err(reason) => self.status = reason,
-            }
-            return Task::none();
-        }
-        let Some(session) = self.scenario_reorder.session.as_ref() else {
-            return Task::none();
-        };
-        if !session.matches(self.project(), event.context, &event.snapshot, event.token) {
-            return Task::none();
-        }
-        if let Intent::Finish(slot) = &event.intent
-            && session
-                .current_preview()
-                .is_none_or(|preview| preview.slot != *slot)
-        {
-            return Task::none();
-        }
-        if matches!(&event.intent, Intent::Cancel) {
-            self.scenario_reorder_cancel();
-            self.status = "Reorder cancelled. Sequence unchanged.".into();
-            return Task::none();
-        }
-        if !self.scenario_reorder_enabled() {
-            self.scenario_reorder_cancel();
-            return Task::none();
-        }
-        match event.intent {
-            Intent::Choose(slot) => {
-                let preview = self
-                    .scenario_reorder
-                    .session
-                    .as_mut()
-                    .expect("admitted session")
-                    .preview(slot);
-                self.status = match &preview.outcome {
-                    Outcome::Refused(reason) => reason.clone(),
-                    Outcome::Noop => "This destination leaves the semantic order unchanged.".into(),
-                    Outcome::Change => match preview.presentation.as_ref().map(|shown| shown.status()) {
-                        Some(PresentationStatus::Ready) => "Review the semantic order, then apply reorder. Saved positions are preserved.".into(),
-                        Some(PresentationStatus::Fallback { .. }) => "The new semantic order requires automatic display fallback. Apply keeps the requested saved view and its authored positions.".into(),
-                        _ => "The candidate cannot be displayed; reorder cannot be applied.".into(),
-                    },
-                };
-            }
-            Intent::Query(query) => {
-                self.scenario_reorder.query = query;
-                self.scenario_reorder.page = 0;
-            }
-            Intent::Page(page) => self.scenario_reorder.page = page,
-            Intent::Finish(slot) => {
-                let label = |id| {
-                    self.project().elements.get(&id).map_or_else(
-                        || id.to_string(),
-                        |element| {
-                            format!(
-                                "{} (@{})",
-                                short_label(&element.name),
-                                short_label(&element.alias)
-                            )
-                        },
-                    )
-                };
-                let parent_name = label(slot.parent);
-                let destination = slot.before.map_or_else(
-                    || "at the end".to_owned(),
-                    |anchor| format!("before {}", label(anchor)),
-                );
-                let session = self
-                    .scenario_reorder
-                    .session
-                    .take()
-                    .expect("admitted session");
-                let selection_visible = session
-                    .current_preview()
-                    .is_some_and(|preview| preview.selection_visible);
-                let result =
-                    session.finish(self.project(), event.context, &event.snapshot, event.token);
-                self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-                self.scenario_reorder.query.clear();
-                self.scenario_reorder.page = 0;
-                match result {
-                    Err(reason) => self.status = reason,
-                    Ok(completion) => {
-                        debug_assert_eq!(completion.representation, event.context.representation);
-                        if !selection_visible {
-                            self.status = "The candidate would hide a selected occurrence; reorder was not applied.".into();
-                        } else if matches!(
-                            completion.presentation_status,
-                            PresentationStatus::Unavailable { .. }
-                        ) {
-                            self.status =
-                                "The candidate cannot be displayed; reorder was not applied."
-                                    .into();
-                        } else if let Some(command) = completion.command {
-                            match self.document.execute(*command) {
-                                Ok(_) => {
-                                    if let Some(crate::diagram_usage::Target::ScenarioObject(
-                                        primary,
-                                    )) = completion.snapshot.primary()
-                                    {
-                                        self.selected = *primary;
-                                    }
-                                    self.sync();
-                                    self.reconcile_multiselect();
-                                    self.inspect_scenario_multiselect_primary();
-                                    let mut summary = format!(
-                                        "Moved {} selected occurrences {} in {}. {}. Saved positions are preserved.",
-                                        completion.snapshot.targets().len(),
-                                        destination,
-                                        parent_name,
-                                        result_neighborhood(
-                                            self.project(),
-                                            slot.parent,
-                                            &completion.snapshot
-                                        )
-                                    );
-                                    if matches!(
-                                        completion.presentation_status,
-                                        PresentationStatus::Fallback { .. }
-                                    ) {
-                                        summary.push_str(" Automatic display fallback is active.");
-                                    }
-                                    self.scenario_reorder.summary =
-                                        self.scenario_context().map(|context| (context, summary));
-                                    self.scenario_reorder.summary_selection =
-                                        self.multiselect_snapshot();
-                                    self.status = if matches!(
-                                        completion.presentation_status,
-                                        PresentationStatus::Fallback { .. }
-                                    ) {
-                                        "Semantic order updated. Automatic display fallback is active; the requested saved view and authored positions are preserved.".into()
-                                    } else {
-                                        "Semantic order updated. Saved positions are preserved."
-                                            .into()
-                                    };
-                                }
-                                Err(error) => {
-                                    self.status = format!("Reorder was not applied: {error}")
-                                }
-                            }
-                        } else {
-                            self.status = "Semantic order unchanged.".into();
-                        }
-                    }
-                }
-            }
-            Intent::Begin | Intent::Cancel => unreachable!(),
-        }
-        Task::none()
-    }
-}
-
-#[cfg(test)]
-mod summary_tests;
-#[cfg(test)]
-mod tests;

crates/oa-desktop/src/app/scenario_reorder/summary_tests.rs

@@ -1,231 +0,0 @@
-use super::*;
-use crate::behavior::scenario::{CanvasEvent, Slot, direct_tests};
-use crate::behavior::scenario_layout::Representation;
-use crate::diagram_usage::Target;
-use oa_core::{Diagram, DiagramLayout, Layer, OccurrenceBody, ProjectionKind, ScenarioLayout};
-
-fn committed() -> (App, Id, Id, oa_core::source_project::SourceBundle) {
-    let f = direct_tests::fixture();
-    let mut project = f.project;
-    let mut extra = project
-        .make_element(Kind::Occurrence, Layer::Oa, "Tail", Some(f.owner))
-        .unwrap();
-    if let Some(oa_core::SharedBody::Occurrence { body, .. }) = extra.shared_mut() {
-        *body = OccurrenceBody::Action {
-            action: None,
-            lifeline: None,
-        };
-    }
-    let extra_id = extra.id;
-    project.elements.insert(extra_id, extra);
-    project
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(extra_id);
-    let diagram = Id::new_v4();
-    project.diagrams.insert(
-        diagram,
-        Diagram {
-            id: diagram,
-            alias: "summary_view".into(),
-            name: "Summary view".into(),
-            description: String::new(),
-            layer: Layer::Oa,
-            projection: ProjectionKind::Scenario { scenario: f.owner },
-            nodes: Default::default(),
-            routes: vec![],
-            view_options: Default::default(),
-            layout: Some(DiagramLayout::Scenario(ScenarioLayout::default())),
-        },
-    );
-    let mut app = App::with_project(project);
-    let _ = app.update(Message::Select(f.owner));
-    let _ = app.update(Message::Diagram(Choice {
-        id: diagram,
-        label: "Summary view".into(),
-    }));
-    for (id, choice) in [
-        (f.call, multiselect::Choice::Replace),
-        (f.reply, multiselect::Choice::Add),
-    ] {
-        let event = selection::Event {
-            context: app.scenario_context().unwrap(),
-            snapshot: app.multiselect_snapshot().unwrap(),
-            intent: selection::Intent::Choose(Target::ScenarioObject(id), choice),
-        };
-        let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(
-            event,
-        ))));
-    }
-    viewport(&mut app, 700.);
-    let baseline = app.document.bundle().clone();
-    dispatch(&mut app, Intent::Begin);
-    let slot = Slot {
-        parent: f.owner,
-        before: None,
-    };
-    dispatch(&mut app, Intent::Choose(slot));
-    dispatch(&mut app, Intent::Finish(slot));
-    assert_eq!(
-        app.project().elements[&f.owner].steps().unwrap(),
-        &[extra_id, f.call, f.reply]
-    );
-    assert!(app.scenario_reorder.summary.is_some(), "{}", app.status);
-    (app, f.owner, f.call, baseline)
-}
-
-fn dispatch(app: &mut App, intent: Intent) {
-    let event = Event {
-        context: app.scenario_context().unwrap(),
-        snapshot: app.multiselect_snapshot().unwrap(),
-        token: app
-            .scenario_reorder
-            .session
-            .as_ref()
-            .map_or_else(Id::new_v4, Session::token),
-        intent,
-    };
-    let _ = app.update(Message::ScenarioReorder(Box::new(event)));
-}
-
-fn viewport(app: &mut App, height: f32) {
-    let context = app.scenario_context().unwrap();
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Viewport(
-        context,
-        iced::Size::new(900., height),
-    )));
-}
-
-#[test]
-fn scenario_reorder_summary_survives_diagnostics_resize_and_camera_then_undo_clears() {
-    let (mut app, _, _, baseline) = committed();
-    let summary = app.scenario_reorder.summary.clone();
-    let changed = app.document.bundle().clone();
-    let epoch = app.canvas_epoch;
-    viewport(&mut app, 660.);
-    assert_ne!(
-        app.canvas_epoch, epoch,
-        "real diagnostics-height viewport change must retire input"
-    );
-    assert_eq!(app.scenario_reorder.summary, summary);
-    let context = app.scenario_context().unwrap();
-    let camera = app.behavior.scenario.camera_boundary();
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Camera(
-        context,
-        app.camera_epoch,
-        crate::behavior::canvas_workspace::Event::Pan(iced::Vector::new(24., 12.)),
-    )));
-    assert!(app.behavior.scenario.camera_boundary() != camera);
-    assert_eq!(app.scenario_reorder.summary, summary);
-    assert_eq!(app.document.bundle(), &changed);
-    let _ = app.update(Message::Undo);
-    assert!(app.scenario_reorder.summary.is_none());
-    assert!(app.scenario_reorder.summary_selection.is_none());
-    assert_eq!(app.document.bundle(), &baseline);
-}
-
-#[test]
-fn scenario_reorder_summary_retires_on_view_selection_and_new_operation() {
-    for action in 0..3 {
-        let (mut app, owner, call, _) = committed();
-        let source = app.document.bundle().clone();
-        match action {
-            0 => {
-                let context = app.scenario_context().unwrap();
-                let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Representation(
-                    context,
-                    Representation::Derived { owner },
-                )));
-                assert_eq!(
-                    app.scenario_context().unwrap().representation,
-                    Representation::Derived { owner }
-                );
-            }
-            1 => {
-                let event = selection::Event {
-                    context: app.scenario_context().unwrap(),
-                    snapshot: app.multiselect_snapshot().unwrap(),
-                    intent: selection::Intent::Collapse(Target::ScenarioObject(call)),
-                };
-                let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(
-                    event,
-                ))));
-            }
-            _ => {
-                dispatch(&mut app, Intent::Begin);
-                assert!(app.scenario_reorder.session.is_some());
-                dispatch(&mut app, Intent::Cancel);
-                assert!(app.scenario_reorder.session.is_none());
-                assert_eq!(app.status, "Reorder cancelled. Sequence unchanged.");
-            }
-        }
-        assert!(app.scenario_reorder.summary.is_none());
-        assert!(app.scenario_reorder.summary_selection.is_none());
-        assert_eq!(app.document.bundle(), &source);
-    }
-}
-
-#[test]
-fn scenario_reorder_summary_selection_generation_aba_is_not_a_camera_change() {
-    let (mut app, _, call, _) = committed();
-    let captured = app.multiselect_snapshot().unwrap();
-    let selected = app.diagram_selection.as_mut().unwrap();
-    assert!(selected.set_primary(&Target::ScenarioObject(call)));
-    assert!(selected.set_primary(captured.primary().unwrap()));
-    assert_eq!(selected.targets(), captured.targets());
-    assert_eq!(selected.primary(), captured.primary());
-    app.scenario_reorder_reconcile();
-    assert!(app.scenario_reorder.summary.is_none());
-}
-
-#[test]
-fn scenario_reorder_summary_clears_after_real_spacing_commit_without_another_event() {
-    use crate::behavior::scenario::spacing::{Event as Spacing, Target as SpacingTarget};
-    let (mut app, owner, call, _) = committed();
-    let reordered = app.document.snapshot();
-    let selection = app.multiselect_snapshot().unwrap();
-    let begin =
-        crate::app::scenario_spacing::tests::packet_for_app(&app, SpacingTarget::Message(call));
-    let Spacing::Begin { press_screen, .. } = begin else {
-        unreachable!()
-    };
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Spacing(begin)));
-    assert_eq!(app.behavior.scenario.spacing_token(), Some(begin.token()));
-    assert!(app.scenario_reorder.summary.is_some());
-    let screen = press_screen + iced::Vector::new(0., 24.);
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Spacing(
-        Spacing::Move {
-            stamp: begin.stamp(),
-            token: begin.token(),
-            screen,
-        },
-    )));
-    assert_eq!(app.document.bundle(), &reordered.bundle);
-    let finish = Spacing::Finish {
-        stamp: begin.stamp(),
-        token: begin.token(),
-        screen,
-    };
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Spacing(finish)));
-    assert_ne!(
-        app.document.bundle(),
-        &reordered.bundle,
-        "spacing must actually commit: {}",
-        app.status
-    );
-    assert_eq!(
-        app.project().elements[&owner].steps(),
-        reordered.decoded.project.elements[&owner].steps()
-    );
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        selection.targets()
-    );
-    assert!(app.scenario_reorder.summary.is_none());
-    assert!(app.scenario_reorder.summary_selection.is_none());
-    let _ = app.update(Message::Undo);
-    assert_eq!(app.document.bundle(), &reordered.bundle);
-}

crates/oa-desktop/src/app/scenario_spacing.rs

@@ -1,33 +1,9 @@
 //! Admit spacing packets before ordinary navigation can retire a newer reveal.
 use super::*;
-use crate::diagram_usage::Target;
-use behavior::scenario::{
-    selection,
-    spacing::{Event, Refusal, controller::Finish},
-};
+use behavior::scenario::spacing::{Event, controller::Finish};
 
 #[cfg(test)]
-mod group_tests;
-#[cfg(test)]
-pub(super) mod tests;
-
-fn refusal_reason(refusal: &Refusal) -> String {
-    match refusal {
-        Refusal::InvalidSelection(reason) => (*reason).into(),
-        Refusal::TargetNotRendered(_) => {
-            "Every selected object must be a rendered local message or lifeline in this saved view."
-                .into()
-        }
-        Refusal::Geometry(_) => {
-            "These positions cannot be displayed together. The saved arrangement is unchanged."
-                .into()
-        }
-        Refusal::Command(reason) => reason.clone(),
-        _ => {
-            "The drag could not be applied in this view. The saved arrangement is unchanged.".into()
-        }
-    }
-}
+mod tests;
 
 impl App {
     pub(super) fn spacing_enabled(&self) -> bool {
@@ -40,54 +16,22 @@ impl App {
     }
 
     pub(super) fn scenario_spacing(&mut self, event: Event) -> Task<Message> {
-        if self.scenario_reorder.session.is_some() {
-            return Task::none();
-        }
         let stamp = event.stamp();
         if self.scenario_context() != Some(stamp.context) || self.camera_epoch != stamp.camera_epoch
         {
             return Task::none();
         }
-        let Some(snapshot) = self.multiselect_snapshot() else {
-            return Task::none();
-        };
-        if snapshot.generation() != stamp.selection_generation
-            || snapshot.context() != selection::context(stamp.context)
-        {
-            return Task::none();
-        }
         let state = &self.behavior.scenario;
         let matches =
             state.spacing_token() == Some(event.token()) && state.spacing_stamp() == Some(stamp);
         if match event {
             Event::Begin { token, .. } => token.is_nil() || state.spacing_token().is_some(),
-            _ => {
-                !matches
-                    || !state.spacing_snapshot().is_some_and(|captured| {
-                        self.diagram_selection.as_ref().is_some_and(|selected| {
-                            selected.matches(captured, selection::context(stamp.context))
-                        })
-                    })
-            }
+            _ => !matches,
         } {
             return Task::none();
         }
-        if matches!(event, Event::Begin { .. }) {
-            let visible = selection::visible(self.project(), stamp.context, self.selected);
-            if !snapshot
-                .targets()
-                .iter()
-                .all(|target| visible.contains(target))
-            {
-                // This otherwise current Begin cannot be replayed after repair.
-                self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-                self.status =
-                    "Every selected object must still be visible before moving the group.".into();
-                return Task::none();
-            }
-        }
         if matches!(event, Event::Cancel { .. }) || !self.spacing_enabled() {
-            if self.behavior.scenario.cancel_spacing() || matches!(event, Event::Begin { .. }) {
+            if self.behavior.scenario.cancel_spacing() {
                 self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
             }
             return Task::none();
@@ -95,38 +39,18 @@ impl App {
         match event {
             Event::Begin { .. } => {
                 let mut state = std::mem::take(&mut self.behavior.scenario);
-                let result = state.begin_spacing_with_snapshot(self.project(), event, snapshot);
+                let result = state.begin_spacing(self.project(), event);
                 self.behavior.scenario = state;
-                if let Err(error) = result {
-                    // Consume admitted failed starts too; a repeated Begin is stale.
-                    self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
-                    self.status = refusal_reason(&error);
+                if result.is_err() {
+                    self.status = "The drag could not start in this view. Try again.".into();
                 }
             }
             Event::Move { screen, .. } => self.behavior.scenario.move_spacing(screen),
             Event::Finish { screen, .. } => {
-                // Full captured selection matched above, before taking the session.
-                let captured = self
-                    .behavior
-                    .scenario
-                    .spacing_snapshot()
-                    .cloned()
-                    .expect("admitted session snapshot");
-                let group = captured.targets().len() > 1;
                 let finished = self.behavior.scenario.finish_spacing(screen);
+                // Retire queued packets even for zero motion or a refused finish.
                 self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
                 match finished {
-                    Ok(Finish::Click(target)) if group => {
-                        let target = Target::ScenarioObject(target);
-                        // The controller only captures a pressed member of this set.
-                        if captured.targets().contains(&target) {
-                            self.diagram_selection
-                                .as_mut()
-                                .expect("admitted selection")
-                                .replace(target, |_| true);
-                            self.inspect_scenario_multiselect_primary();
-                        }
-                    }
                     Ok(Finish::Click(target)) => self.select(target),
                     Ok(Finish::Noop) => {}
                     Ok(Finish::Commit {
@@ -134,38 +58,28 @@ impl App {
                         selected,
                         scale,
                         pan,
-                    }) => match self.document.execute(*command) {
-                        Ok(_) => {
-                            self.selected = if group {
-                                match captured.primary() {
-                                    Some(Target::ScenarioObject(id)) => *id,
-                                    _ => selected,
-                                }
-                            } else {
-                                selected
-                            };
-                            self.selected_node = None;
-                            self.diagram_navigation_focus = None;
-                            self.behavior.scenario.accept_spacing_camera(scale, pan);
-                            self.sync();
-                            if group {
-                                self.inspect_scenario_multiselect_primary();
+                    }) => {
+                        // Document prepares and writes the source candidate before
+                        // committing its snapshot. Failure leaves camera/selection
+                        // and source/history at their accepted values.
+                        match self.document.execute(*command) {
+                            Ok(_) => {
+                                self.selected = selected;
+                                self.selected_node = None;
+                                self.diagram_navigation_focus = None;
+                                self.behavior.scenario.accept_spacing_camera(scale, pan);
+                                self.sync();
+                                self.status = "Scenario spacing updated.".into();
                             }
-                            self.status = if group {
-                                format!(
-                                    "Spacing updated for {} selected objects. Scenario order is unchanged.",
-                                    captured.targets().len()
-                                )
-                            } else {
-                                "Scenario spacing updated.".into()
-                            };
+                            Err(error) => self.status = format!("Spacing was not applied: {error}"),
                         }
-                        Err(error) => self.status = format!("Spacing was not applied: {error}"),
-                    },
-                    Err(error) => self.status = refusal_reason(&error),
+                    }
+                    Err(_) => {
+                        self.status =
+                            "That position cannot be applied. The saved arrangement is unchanged."
+                                .into()
+                    }
                 }
-                self.reconcile_multiselect();
-                self.scenario_reorder_reconcile();
             }
             Event::Cancel { .. } => unreachable!(),
         }

crates/oa-desktop/src/app/scenario_spacing/group_tests.rs

@@ -1,374 +0,0 @@
-use super::tests::{begin, finish, move_to, packet_for_app, send, setup};
-use super::*;
-use crate::behavior::scenario::{CanvasEvent, selection, spacing::Target};
-use crate::behavior::scenario_layout::Representation;
-use crate::diagram_usage::Target as SelectedTarget;
-use iced::Vector;
-use oa_core::{
-    DiagramLayout, OccurrenceEndpoint, ScenarioLanePosition, ScenarioLayout,
-    ScenarioMessagePosition,
-};
-
-fn id(app: &App, alias: &str) -> Id {
-    app.project()
-        .identities()
-        .into_iter()
-        .find(|(_, a)| *a == alias)
-        .unwrap()
-        .0
-}
-fn choose(app: &mut App, id: Id, choice: multiselect::Choice) {
-    let event = selection::Event {
-        context: app.scenario_context().unwrap(),
-        snapshot: app.multiselect_snapshot().unwrap(),
-        intent: selection::Intent::Choose(SelectedTarget::ScenarioObject(id), choice),
-    };
-    let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(
-        event,
-    ))));
-}
-fn group(messages: bool, reverse: bool) -> (App, [Id; 2]) {
-    let (mut app, lane, message) = setup();
-    let ids = if messages {
-        [message, id(&app, "second")]
-    } else {
-        [lane, id(&app, "operator")]
-    };
-    let order = if reverse { [ids[1], ids[0]] } else { ids };
-    for member in order {
-        choose(&mut app, member, multiselect::Choice::Add);
-    }
-    (app, ids)
-}
-fn target(messages: bool, id: Id) -> Target {
-    if messages {
-        Target::Message(id)
-    } else {
-        Target::Lane(id)
-    }
-}
-fn delta(messages: bool, pixels: f32) -> Vector {
-    if messages {
-        Vector::new(0., pixels)
-    } else {
-        Vector::new(pixels, 0.)
-    }
-}
-
-#[test]
-fn either_pressed_member_moves_complete_group_and_preserves_primary_source_and_one_history_step() {
-    for messages in [false, true] {
-        for pressed_index in 0..2 {
-            let (mut app, ids) = group(messages, true);
-            // Automatic lane order depends on generated identities. Give this
-            // literal geometry oracle explicit authored starting coordinates.
-            let c = app.scenario_context().unwrap();
-            let Representation::Saved { diagram } = c.representation else {
-                unreachable!()
-            };
-            let mut initial = app.project().clone();
-            let mut members = ids.to_vec();
-            members.sort();
-            let mut layout = ScenarioLayout::default();
-            for member in members {
-                if messages {
-                    layout.messages.push(ScenarioMessagePosition {
-                        address: OccurrenceEndpoint {
-                            references: vec![],
-                            occurrence: member,
-                        },
-                        send_y: if member == ids[0] { 148. } else { 240. },
-                    });
-                } else {
-                    layout.lanes.push(ScenarioLanePosition {
-                        lifeline: member,
-                        x: if member == ids[0] { 160. } else { 400. },
-                    });
-                }
-            }
-            initial.diagrams.get_mut(&diagram).unwrap().layout =
-                Some(DiagramLayout::Scenario(layout));
-            app.document =
-                Document::from_project(initial, oa_core::source_project::ProjectLimits::default())
-                    .unwrap();
-            app.sync();
-            let original = app.document.snapshot();
-            let original_selection = app.multiselect_snapshot().unwrap();
-            let primary = app.selected;
-            let c = app.scenario_context().unwrap();
-            let Representation::Saved { diagram } = c.representation else {
-                unreachable!()
-            };
-            let (event, start, scale) = begin(&mut app, target(messages, ids[pressed_index]));
-            let world_delta = 24. / scale;
-            move_to(&mut app, event, start + delta(messages, 24.));
-            assert_eq!(app.project(), &original.decoded.project);
-            assert_eq!(app.document.bundle(), &original.bundle);
-            assert_eq!(app.selected, primary);
-            assert_eq!(
-                app.behavior.scenario.spacing_snapshot(),
-                Some(&original_selection)
-            );
-            let mut expected = original.decoded.project.clone();
-            let mut members = ids.to_vec();
-            members.sort();
-            let mut layout = ScenarioLayout::default();
-            for member in members {
-                if messages {
-                    let y: f32 = if member == ids[0] { 148. } else { 240. };
-                    layout.messages.push(ScenarioMessagePosition {
-                        address: OccurrenceEndpoint {
-                            references: vec![],
-                            occurrence: member,
-                        },
-                        send_y: (f64::from(y) + f64::from(world_delta)) as f32,
-                    });
-                } else {
-                    let x: f32 = if member == ids[0] { 160. } else { 400. };
-                    layout.lanes.push(ScenarioLanePosition {
-                        lifeline: member,
-                        x: (f64::from(x) + f64::from(world_delta)) as f32,
-                    });
-                }
-            }
-            expected.diagrams.get_mut(&diagram).unwrap().layout =
-                Some(DiagramLayout::Scenario(layout));
-            finish(&mut app, event, start + delta(messages, 24.));
-            assert_eq!(app.project(), &expected);
-            assert_eq!(app.selected, primary);
-            assert_eq!(
-                app.multiselect_snapshot().unwrap().targets(),
-                original_selection.targets()
-            );
-            assert_eq!(
-                app.multiselect_snapshot().unwrap().primary(),
-                original_selection.primary()
-            );
-            let saved = app.document.bundle().clone();
-            let _ = app.update(Message::ShortcutUndo(false));
-            assert_eq!(app.project(), &original.decoded.project);
-            assert_eq!(app.document.bundle(), &original.bundle);
-            assert!(!app.document.can_undo() && app.document.can_redo());
-            let _ = app.update(Message::ShortcutUndo(true));
-            assert_eq!(app.project(), &expected);
-            assert_eq!(app.document.bundle(), &saved);
-            let reopened =
-                Document::from_bundle(saved, oa_core::source_project::ProjectLimits::default())
-                    .unwrap();
-            assert_eq!(reopened.project(), &expected);
-        }
-    }
-}
-
-#[test]
-fn group_stationary_click_collapses_but_offaxis_outback_cancel_preserve_group_and_redo() {
-    for messages in [false, true] {
-        for mode in 0..4 {
-            let (mut app, ids) = group(messages, true);
-            let (seed, start, _) = begin(&mut app, target(messages, ids[0]));
-            finish(&mut app, seed, start + delta(messages, 20.));
-            let _ = app.update(Message::ShortcutUndo(false));
-            assert!(app.document.can_redo());
-            let original = app.document.snapshot();
-            let selected = app.multiselect_snapshot().unwrap();
-            let primary = app.selected;
-            let camera = app.behavior.scenario.camera_boundary();
-            let (event, start, _) = begin(&mut app, target(messages, ids[1]));
-            match mode {
-                0 => finish(&mut app, event, start),
-                1 => finish(&mut app, event, start + delta(!messages, 50.)),
-                2 => {
-                    move_to(&mut app, event, start + delta(messages, 30.));
-                    finish(&mut app, event, start);
-                }
-                _ => {
-                    move_to(&mut app, event, start + delta(messages, 30.));
-                    send(
-                        &mut app,
-                        Event::Cancel {
-                            stamp: event.stamp(),
-                            token: event.token(),
-                        },
-                    );
-                }
-            }
-            assert_eq!(app.project(), &original.decoded.project);
-            assert_eq!(app.document.bundle(), &original.bundle);
-            assert!(app.document.can_redo() && !app.document.can_undo());
-            assert!(camera == app.behavior.scenario.camera_boundary());
-            if mode == 0 {
-                assert_eq!(
-                    app.multiselect_snapshot().unwrap().targets(),
-                    &[SelectedTarget::ScenarioObject(ids[1])]
-                );
-                assert_eq!(app.selected, ids[1]);
-            } else {
-                assert_eq!(
-                    app.multiselect_snapshot().unwrap().targets(),
-                    selected.targets()
-                );
-                assert_eq!(app.selected, primary);
-            }
-        }
-    }
-}
-
-#[test]
-fn stale_group_packets_and_generation_forgery_do_not_disturb_a_newer_live_gesture() {
-    let (mut app, ids) = group(true, true);
-    let (old, start, _) = begin(&mut app, Target::Message(ids[0]));
-    send(
-        &mut app,
-        Event::Cancel {
-            stamp: old.stamp(),
-            token: old.token(),
-        },
-    );
-    let (current, current_start, _) = begin(&mut app, Target::Message(ids[1]));
-    let original = app.document.snapshot();
-    let selection = app.multiselect_snapshot();
-    let epoch = app.canvas_epoch;
-    let status = app.status.clone();
-    let mut forged = current;
-    if let Event::Begin { stamp, .. } = &mut forged {
-        stamp.selection_generation = stamp.selection_generation.wrapping_add(1);
-    }
-    for event in [
-        old,
-        forged,
-        Event::Move {
-            stamp: old.stamp(),
-            token: old.token(),
-            screen: start + Vector::new(0., 90.),
-        },
-        Event::Finish {
-            stamp: old.stamp(),
-            token: old.token(),
-            screen: start + Vector::new(0., 90.),
-        },
-        Event::Cancel {
-            stamp: old.stamp(),
-            token: old.token(),
-        },
-    ] {
-        send(&mut app, event);
-        assert_eq!(app.canvas_epoch, epoch);
-        assert_eq!(app.status, status);
-        assert_eq!(app.multiselect_snapshot(), selection);
-        assert_eq!(app.document.bundle(), &original.bundle);
-        assert_eq!(app.behavior.scenario.spacing_token(), Some(current.token()));
-    }
-    finish(&mut app, current, current_start + Vector::new(0., 24.));
-    assert!(app.document.can_undo());
-}
-
-#[test]
-fn mixed_group_drag_refuses_whole_set_without_primary_only_change_or_replay() {
-    let (mut app, lane, message) = setup();
-    choose(&mut app, message, multiselect::Choice::Add);
-    choose(&mut app, lane, multiselect::Choice::Add);
-    let event = packet_for_app(&app, Target::Message(message));
-    let original = app.document.snapshot();
-    let selected = app.multiselect_snapshot().unwrap();
-    let epoch = app.canvas_epoch;
-    send(&mut app, event);
-    assert_eq!(app.canvas_epoch, epoch);
-    let Event::Begin { press_screen, .. } = event else {
-        unreachable!()
-    };
-    move_to(&mut app, event, press_screen + Vector::new(0., 30.));
-    assert_eq!(app.project(), &original.decoded.project);
-    finish(&mut app, event, press_screen + Vector::new(0., 30.));
-    assert_ne!(app.canvas_epoch, epoch);
-    assert!(app.behavior.scenario.spacing_token().is_none());
-    assert_eq!(app.document.bundle(), &original.bundle);
-    assert_eq!(app.project(), &original.decoded.project);
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        selected.targets()
-    );
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().primary(),
-        selected.primary()
-    );
-    let status = app.status.clone();
-    let epoch = app.canvas_epoch;
-    send(&mut app, event);
-    assert_eq!(app.status, status);
-    assert_eq!(app.canvas_epoch, epoch);
-}
-
-#[test]
-fn mixed_group_stationary_click_on_either_role_still_selects_only_that_member() {
-    for lane_hit in [false, true] {
-        let (mut app, lane, message) = setup();
-        choose(&mut app, message, multiselect::Choice::Add);
-        choose(&mut app, lane, multiselect::Choice::Add);
-        let original = app.document.snapshot();
-        let member = if lane_hit { lane } else { message };
-        let (event, start, _) = begin(&mut app, target(!lane_hit, member));
-        finish(&mut app, event, start);
-        assert_eq!(
-            app.multiselect_snapshot().unwrap().targets(),
-            &[SelectedTarget::ScenarioObject(member)]
-        );
-        assert_eq!(app.selected, member);
-        assert_eq!(app.document.bundle(), &original.bundle);
-        assert!(!app.document.can_undo());
-    }
-}
-
-#[test]
-fn malformed_current_begin_consumes_its_lifetime_without_editing_or_replaying() {
-    let (mut app, ids) = group(true, true);
-    let mut event = packet_for_app(&app, Target::Message(ids[0]));
-    if let Event::Begin { canvas_bounds, .. } = &mut event {
-        canvas_bounds.width = 0.;
-    }
-    let original = app.document.snapshot();
-    let selection = app.multiselect_snapshot().unwrap();
-    let epoch = app.canvas_epoch;
-    send(&mut app, event);
-    assert_ne!(app.canvas_epoch, epoch);
-    assert!(app.behavior.scenario.spacing_token().is_none());
-    assert_eq!(app.document.bundle(), &original.bundle);
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        selection.targets()
-    );
-    let epoch = app.canvas_epoch;
-    let status = app.status.clone();
-    send(&mut app, event);
-    assert_eq!(app.canvas_epoch, epoch);
-    assert_eq!(app.status, status);
-}
-
-#[test]
-fn group_source_write_failure_is_atomic_and_preserves_selection_and_camera() {
-    let (mut app, ids) = group(true, true);
-    let bundle = app.document.bundle().clone();
-    let mut limits = oa_core::source_project::ProjectLimits::default();
-    limits.model.max_source_bytes = bundle.files.values().map(String::len).sum();
-    app.document = Document::from_bundle(bundle, limits).unwrap();
-    app.sync();
-    let original = app.document.snapshot();
-    let selection = app.multiselect_snapshot().unwrap();
-    let primary = app.selected;
-    let camera = app.behavior.scenario.camera_boundary();
-    let (event, start, _) = begin(&mut app, Target::Message(ids[1]));
-    finish(&mut app, event, start + Vector::new(0., 24.));
-    assert!(
-        app.status.starts_with("Spacing was not applied:"),
-        "{}",
-        app.status
-    );
-    assert_eq!(app.project(), &original.decoded.project);
-    assert_eq!(app.document.bundle(), &original.bundle);
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        selection.targets()
-    );
-    assert_eq!(app.selected, primary);
-    assert!(camera == app.behavior.scenario.camera_boundary());
-    assert!(!app.document.can_undo());
-}

crates/oa-desktop/src/app/scenario_spacing/tests.rs

@@ -8,7 +8,7 @@ use behavior::scenario::{
 };
 use iced::{Point, Size, Vector};
 
-pub(super) fn setup() -> (App, Id, Id) {
+fn setup() -> (App, Id, Id) {
     let (document, owner, diagram, lane, message) = fixture();
     let mut app = App::with_project(document.project().clone());
     let _ = app.update(Message::Select(owner));
@@ -88,21 +88,14 @@ fn stale_text_and_scenario_messages_do_not_retire_a_new_saved_spacing_gesture()
         "the current gesture remains usable"
     );
 }
-pub(in crate::app) fn packet_for_app(app: &App, target: Target) -> Event {
-    let mut event = packet(
+fn begin(app: &mut App, target: Target) -> (Event, Point, f32) {
+    let event = packet(
         app.project(),
         &app.behavior.scenario,
         app.scenario_context().unwrap(),
         app.camera_epoch,
         target,
     );
-    if let Event::Begin { stamp, .. } = &mut event {
-        stamp.selection_generation = app.multiselect_snapshot().unwrap().generation();
-    }
-    event
-}
-pub(super) fn begin(app: &mut App, target: Target) -> (Event, Point, f32) {
-    let event = packet_for_app(app, target);
     let Event::Begin {
         press_screen,
         scale,
@@ -115,10 +108,10 @@ pub(super) fn begin(app: &mut App, target: Target) -> (Event, Point, f32) {
     assert_eq!(app.behavior.scenario.spacing_token(), Some(event.token()));
     (event, press_screen, scale)
 }
-pub(super) fn send(app: &mut App, event: Event) {
+fn send(app: &mut App, event: Event) {
     let _ = app.update(Message::ScenarioCanvas(CanvasEvent::Spacing(event)));
 }
-pub(super) fn move_to(app: &mut App, begin: Event, screen: Point) {
+fn move_to(app: &mut App, begin: Event, screen: Point) {
     send(
         app,
         Event::Move {
@@ -128,7 +121,7 @@ pub(super) fn move_to(app: &mut App, begin: Event, screen: Point) {
         },
     );
 }
-pub(super) fn finish(app: &mut App, begin: Event, screen: Point) {
+fn finish(app: &mut App, begin: Event, screen: Point) {
     send(
         app,
         Event::Finish {

crates/oa-desktop/src/app/state_diagram.rs

@@ -116,7 +116,6 @@ impl App {
         }
         match event {
             Event::Selection(event) => self.multiselect_event(event),
-            Event::ModelRemoval(event) => return self.saved_removal_event(*event),
             Event::Remove(intent) => self.remove_from_diagram(intent),
             Event::Viewport(_, size) => {
                 if size.width.is_finite()

crates/oa-desktop/src/app/state_picker_escape_tests.rs

@@ -10,6 +10,11 @@ async fn press_escape(mounted: &mut Mounted, app: &mut App) -> Vec<Message> {
         std::slice::from_ref(&input),
         mouse::Cursor::Unavailable,
     );
+    assert_eq!(
+        statuses,
+        [iced::event::Status::Captured],
+        "the mounted picker must capture Escape before App subscriptions"
+    );
     crate::app::escape::tests::subscriptions(app, input, statuses[0], &mut messages);
     for message in messages.iter().cloned() {
         let task = app.update(message);
@@ -41,17 +46,11 @@ async fn mounted_state_missing_picker_escape_preserves_exact_document_then_reope
     send(&mut app, Message::BehaviorDiagram(choice));
     let mut mounted = Mounted::new(&mut app).await;
     assert_eq!(state_edit::unplaced(app.project(), diagram), vec![f.b]);
-    let focus_id = iced::advanced::widget::Id::from("diagram-keyboard-owner");
-    let (_, canvas, _) = mounted
-        .geometry(&app)
-        .focused
-        .into_iter()
-        .find(|(id, _, _)| id.as_ref() == Some(&focus_id))
-        .unwrap();
-    // The existing picker is immediately above the measured canvas, separated
-    // by 8px. Its 12px text and 8px padding give a 31.6px row.
-    let picker = iced::Point::new(canvas.center_x(), canvas.y - 24.);
-    let option = iced::Point::new(picker.x, canvas.y + 8.);
+    // Locate the stable picker slot itself: selection controls may sit between
+    // it and the canvas. The single menu option opens below this slot.
+    let bounds = mounted.geometry(&app).bounds("state-missing-picker");
+    let picker = bounds.center();
+    let option = iced::Point::new(picker.x, bounds.y + bounds.height * 1.5);
     let before = app.document.snapshot();
     let original = app.project().clone();
     let source = app.document.bundle().clone();

crates/oa-desktop/src/behavior.rs

@@ -1243,7 +1243,6 @@ struct Scene {
     camera_pan: iced::Vector,
     interaction: Option<(scenario::Context, scenario::CanvasTool, bool)>,
     spacing_stamp: Option<scenario::spacing::Stamp>,
-    selection: Option<(scenario::Context, crate::diagram_selection::Snapshot)>,
     coordinate_input: bool,
     pending_placement: Option<(scenario::Slot, Option<Id>)>,
     lanes: BTreeMap<Id, f32>,
@@ -1263,8 +1262,6 @@ struct SequenceSlot {
 }
 #[derive(Default)]
 struct SequenceInput {
-    modifiers: iced::keyboard::Modifiers,
-    group_press: Option<ScenarioGroupPress>,
     context: Option<scenario::Context>,
     tool: scenario::CanvasTool,
     pointer: Option<Point>,
@@ -1272,13 +1269,6 @@ struct SequenceInput {
     source: Option<(Id, scenario::Slot)>,
     press: Option<SequencePress>,
 }
-struct ScenarioGroupPress {
-    context: scenario::Context,
-    snapshot: crate::diagram_selection::Snapshot,
-    target: crate::diagram_usage::Target,
-    start: Point,
-    moved: bool,
-}
 #[derive(Clone, Copy)]
 enum SequencePress {
     Spacing {
@@ -1319,48 +1309,11 @@ impl SequenceInput {
         cancel
     }
     fn cancel(&mut self) {
-        self.group_press = None;
         self.source = None;
         self.press = None;
     }
 }
 impl Scene {
-    fn selection_targets(&self) -> Vec<crate::diagram_usage::Target> {
-        let mut ids = std::collections::BTreeSet::new();
-        ids.extend(
-            self.boxes
-                .iter()
-                .filter(|b| !b.title.is_empty())
-                .map(|b| b.id),
-        );
-        ids.extend(self.lines.iter().map(|line| line.id));
-        ids.extend(self.activations.iter().map(|segment| segment.call));
-        ids.extend(self.render_lanes.keys().copied());
-        ids.extend(self.lifecycle.selection_markers().map(|(id, _)| id));
-        ids.into_iter()
-            .map(crate::diagram_usage::Target::ScenarioObject)
-            .collect()
-    }
-    fn is_selected(&self, id: Id) -> bool {
-        self.selection
-            .as_ref()
-            .map_or(id == self.selected, |(_, snapshot)| {
-                snapshot
-                    .targets()
-                    .contains(&crate::diagram_usage::Target::ScenarioObject(id))
-            })
-    }
-    fn is_group(&self) -> bool {
-        self.selection
-            .as_ref()
-            .is_some_and(|(_, snapshot)| snapshot.targets().len() > 1)
-    }
-    fn selection_action(&self, intent: scenario::selection::Intent) -> Option<Action<Message>> {
-        let (context, snapshot) = self.selection.as_ref()?;
-        Some(
-            Action::publish(scenario::selection::message(*context, snapshot, intent)).and_capture(),
-        )
-    }
     fn removal_target(&self, owner: Id, id: Id) -> bool {
         id != owner
             && (self.boxes.iter().any(|item| item.id == id)
@@ -1387,7 +1340,6 @@ impl Scene {
             selected,
             interaction: None,
             spacing_stamp: None,
-            selection: None,
             coordinate_input: true,
             pending_placement: None,
             lanes: BTreeMap::new(),
@@ -2030,24 +1982,7 @@ impl canvas::Program<Message> for Scene {
         bounds: Rectangle,
         cursor: mouse::Cursor,
     ) -> Option<Action<Message>> {
-        use crate::{app::multiselect::Choice, diagram_usage::Target};
-        use scenario::selection::Intent;
         use scenario::{CanvasEvent, CanvasTool};
-        if let canvas::Event::Keyboard(iced::keyboard::Event::ModifiersChanged(modifiers)) = event {
-            state.modifiers = *modifiers;
-            return None;
-        }
-        if matches!(event, canvas::Event::Window(iced::window::Event::Unfocused)) {
-            state.modifiers = iced::keyboard::Modifiers::default();
-        }
-        if state.group_press.as_ref().is_some_and(|press| {
-            self.selection.as_ref().is_none_or(|(context, snapshot)| {
-                *context != press.context || *snapshot != press.snapshot
-            })
-        }) {
-            state.cancel();
-        }
-
         let (context, tool, editable) = self
             .interaction
             .map_or((None, CanvasTool::Select, false), |(c, t, e)| {
@@ -2072,14 +2007,10 @@ impl canvas::Program<Message> for Scene {
         }
         state.bounds = Some(bounds);
         if (!editable || !self.coordinate_input)
-            && matches!(state.press, Some(SequencePress::Spacing { .. }))
             && let Some(cancelled) = state.cancel_spacing()
         {
             return Some(cancelled);
         }
-        if !editable {
-            state.cancel();
-        }
         // The viewport masks input outside its visible canvas bounds.
         let visible = cursor.position().is_some();
         if !visible
@@ -2106,9 +2037,6 @@ impl canvas::Program<Message> for Scene {
         let cursor = match event {
             canvas::Event::Mouse(mouse::Event::CursorMoved { position }) => {
                 state.pointer = Some(*position);
-                if let Some(press) = &mut state.group_press {
-                    press.moved |= position.distance(press.start) >= 3.;
-                }
                 if let Some(press) = &mut state.press {
                     match press {
                         SequencePress::Message { start, moved, .. }
@@ -2144,22 +2072,9 @@ impl canvas::Program<Message> for Scene {
                 && tool == CanvasTool::Select
                 && (modifiers.is_empty() || *modifiers == iced::keyboard::Modifiers::SHIFT)
                 && state.press.is_none()
-                && state.group_press.is_none()
                 && state.source.is_none() =>
             {
                 let context = context?;
-                if self.is_group() {
-                    let (_, snapshot) = self.selection.as_ref()?;
-                    return Some(
-                        Action::publish(Message::ScenarioRemoval(Box::new(
-                            crate::app::scenario_removal::Event::Begin {
-                                context,
-                                snapshot: Box::new(snapshot.clone()),
-                            },
-                        )))
-                        .and_capture(),
-                    );
-                }
                 if self.removal_target(context.scenario, self.selected) {
                     return Some(
                         Action::publish(Message::ScenarioCanvas(CanvasEvent::Remove(
@@ -2174,10 +2089,7 @@ impl canvas::Program<Message> for Scene {
             canvas::Event::Keyboard(iced::keyboard::Event::KeyPressed {
                 key: iced::keyboard::Key::Named(iced::keyboard::key::Named::Escape),
                 ..
-            }) if state.source.is_some()
-                || state.press.is_some()
-                || state.group_press.is_some() =>
-            {
+            }) if state.source.is_some() || state.press.is_some() => {
                 return state
                     .cancel_spacing()
                     .or_else(|| Some(Action::request_redraw().and_capture()));
@@ -2191,18 +2103,6 @@ impl canvas::Program<Message> for Scene {
             )
         });
         match event {
-            canvas::Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Right)) if editable => {
-                let (context, _) = self.selection.as_ref()?;
-                let hit = self.hit_item(world?)?;
-                let mut request = crate::model_menu::Request::object(hit.id, cursor.position()?);
-                request.scenario = Some(Box::new(*context));
-                request.selection_target = Some(Box::new(Target::ScenarioObject(hit.id)));
-                state.cancel();
-                Some(
-                    Action::publish(Message::Menu(crate::model_menu::Event::Open(request)))
-                        .and_capture(),
-                )
-            }
             canvas::Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
                 if !visible {
                     return None;
@@ -2212,83 +2112,6 @@ impl canvas::Program<Message> for Scene {
                     if !editable {
                         return None;
                     }
-                    if let Some((selection_context, snapshot)) = &self.selection {
-                        let hit = self.hit_item(point).or_else(|| {
-                            (!self.is_group()
-                                && self.is_selected(self.selected)
-                                && matches!(
-                                    context.representation,
-                                    scenario_layout::Representation::Derived { .. }
-                                ))
-                            .then(|| {
-                                self.reorder_handle()
-                                    .filter(|handle| handle.contains(point))
-                            })
-                            .flatten()
-                            .map(|_| SceneHit {
-                                id: self.selected,
-                                role: SceneHitRole::Box,
-                            })
-                        });
-                        if tool != CanvasTool::Select && self.is_group() {
-                            return self.selection_action(Intent::Refuse(
-                                "Select one occurrence before using an authoring tool".into(),
-                            ));
-                        }
-                        if tool == CanvasTool::Select {
-                            if let Some(hit) = hit {
-                                let target = Target::ScenarioObject(hit.id);
-                                if state.modifiers.shift() {
-                                    state.cancel();
-                                    return self
-                                        .selection_action(Intent::Choose(target, Choice::Toggle));
-                                }
-                                let group_spacing_hit = self.coordinate_input
-                                    && self.spacing_stamp.is_some()
-                                    && matches!(
-                                        context.representation,
-                                        scenario_layout::Representation::Saved { .. }
-                                    )
-                                    && matches!(
-                                        hit.role,
-                                        SceneHitRole::LifelineHeader
-                                            | SceneHitRole::MessageBody
-                                            | SceneHitRole::MessageLabel
-                                    );
-                                if self.is_group() && self.is_selected(hit.id) && !group_spacing_hit
-                                {
-                                    state.group_press = Some(ScenarioGroupPress {
-                                        context: *selection_context,
-                                        snapshot: snapshot.clone(),
-                                        target,
-                                        start: cursor.position()?,
-                                        moved: false,
-                                    });
-                                    return Some(Action::request_redraw().and_capture());
-                                }
-                                // Preserve the existing first-press singleton
-                                // spacing/reorder gesture. Replacing a displayed
-                                // group is an explicit selection change first.
-                                if (self.is_group() && !self.is_selected(hit.id))
-                                    || !self.coordinate_input
-                                {
-                                    return self
-                                        .selection_action(Intent::Choose(target, Choice::Replace));
-                                }
-                            } else {
-                                state.cancel();
-                                if state.modifiers.shift() {
-                                    return Some(Action::capture());
-                                }
-                                // Background clearing shares this press with camera panning.
-                                return Some(Action::publish(scenario::selection::message(
-                                    *selection_context,
-                                    snapshot,
-                                    Intent::Clear,
-                                )));
-                            }
-                        }
-                    }
                     if !self.coordinate_input {
                         return self.hit(point).map(|id| {
                             Action::publish(Message::ScenarioCanvas(CanvasEvent::Select(
@@ -2391,27 +2214,6 @@ impl canvas::Program<Message> for Scene {
                     .map(|id| Action::publish(Message::Select(id)).and_capture())
             }
             canvas::Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left)) => {
-                if let Some(press) = state.group_press.take() {
-                    if world.is_none() {
-                        return Some(Action::request_redraw());
-                    }
-                    let intent = if press.moved {
-                        Intent::Refuse(
-                            "This selection cannot be moved here; select one occurrence for its individual actions"
-                                .into(),
-                        )
-                    } else {
-                        Intent::Collapse(press.target)
-                    };
-                    return Some(
-                        Action::publish(scenario::selection::message(
-                            press.context,
-                            &press.snapshot,
-                            intent,
-                        ))
-                        .and_capture(),
-                    );
-                }
                 let press = state.press.take()?;
                 let context = context?;
                 match press {
@@ -2563,7 +2365,7 @@ impl canvas::Program<Message> for Scene {
                     }
                 }),
                 Stroke::default()
-                    .with_color(if self.is_selected(guide.id) {
+                    .with_color(if guide.id == self.selected {
                         style::TEAL
                     } else {
                         style::MUTED
@@ -2589,7 +2391,7 @@ impl canvas::Program<Message> for Scene {
             f.stroke(
                 &path,
                 Stroke::default()
-                    .with_color(if self.is_selected(activation.call) {
+                    .with_color(if activation.call == self.selected {
                         style::TEAL
                     } else {
                         style::BOUNDARY
@@ -2606,7 +2408,7 @@ impl canvas::Program<Message> for Scene {
                 b.marker,
                 Some(Kind::Region | Kind::StateMachine | Kind::Occurrence)
             );
-            let color = if self.is_selected(b.id) {
+            let color = if b.id == self.selected {
                 style::TEAL
             } else {
                 style::BOUNDARY
@@ -2628,7 +2430,7 @@ impl canvas::Program<Message> for Scene {
             }
         }
         for l in self.lines.iter().filter(|line| !line.label.is_empty()) {
-            let color = if self.is_selected(l.id) {
+            let color = if l.id == self.selected {
                 style::TEAL
             } else {
                 style::MUTED
@@ -2684,7 +2486,7 @@ impl canvas::Program<Message> for Scene {
                         content: short(&b.title, ((b.rect.width - 25.) / 7.) as usize),
                         position: Point::new(b.rect.x + 12., b.rect.y + 12.),
                         size: 13.into(),
-                        color: if self.is_selected(b.id) {
+                        color: if b.id == self.selected {
                             style::TEAL
                         } else {
                             style::INK
@@ -2714,19 +2516,6 @@ impl canvas::Program<Message> for Scene {
         }
         self.lifecycle
             .draw_markers(&mut f, self.selected, self.scale, self.camera_pan);
-        if self.selection.is_some() {
-            // Lifecycle glyphs use their exact painted hit identity too.
-            for (id, point) in self.lifecycle.selection_markers() {
-                if self.is_selected(id) {
-                    f.stroke(
-                        &Path::circle(point, 12.),
-                        Stroke::default()
-                            .with_color(style::TEAL)
-                            .with_width(if id == self.selected { 3. } else { 1.5 }),
-                    );
-                }
-            }
-        }
         if let Some((context, tool, editable)) = self.interaction {
             let active = editable
                 && self.coordinate_input
@@ -2753,8 +2542,6 @@ impl canvas::Program<Message> for Scene {
                     context.representation,
                     scenario_layout::Representation::Derived { .. }
                 )
-                && !self.is_group()
-                && self.is_selected(self.selected)
                 && let Some(handle) = self.reorder_handle()
             {
                 f.fill_rectangle(handle.position(), handle.size(), style::TEAL);

crates/oa-desktop/src/behavior/scenario.rs

@@ -6,13 +6,6 @@ use iced::widget::{Column, column, text_input};
 use std::{cell::RefCell, collections::BTreeSet};
 mod camera;
 pub(crate) mod focus;
-pub(crate) mod group_removal;
-pub(crate) mod group_reorder;
-pub(crate) mod reorder_session;
-#[cfg(test)]
-mod reorder_slot_experiments;
-pub(crate) mod reorder_view;
-pub(crate) mod selection;
 pub(crate) mod spacing;
 use super::scenario_layout::{
     Representation,
@@ -150,7 +143,6 @@ impl std::fmt::Display for CanvasTool {
 }
 #[derive(Debug, Clone)]
 pub enum CanvasEvent {
-    Selection(Box<selection::Event>),
     Spacing(spacing::Event),
     Scrolled(Context, ScrollArea, iced::Vector),
     Restored(Context, Id, ScrollArea, iced::Vector),
@@ -194,7 +186,6 @@ impl CanvasEvent {
     pub fn context(&self) -> Context {
         match self {
             Self::Spacing(event) => event.stamp().context,
-            Self::Selection(event) => event.context,
             Self::Scrolled(context, _, _)
             | Self::Restored(context, ..)
             | Self::Viewport(context, _)
@@ -1262,21 +1253,26 @@ pub(crate) fn reorder(
     occurrence: Id,
     slot: Slot,
 ) -> Result<Command, String> {
-    let prepared = group_reorder::Prepared::new(
-        std::sync::Arc::new(p.clone()),
-        owner,
-        &[crate::diagram_usage::Target::ScenarioObject(occurrence)],
-    )?;
-    match prepared.plan(slot)? {
-        group_reorder::Plan::Change(command) => Ok(*command),
-        group_reorder::Plan::Noop => Ok(Command::SetSteps(
-            slot.parent,
-            p.elements[&slot.parent]
-                .steps()
-                .expect("admitted sequence")
-                .clone(),
-        )),
+    let to = slot_index(p, owner, slot)?;
+    if p.elements.get(&occurrence).and_then(|e| e.parent) != Some(slot.parent) {
+        return Err(
+            "Reorder inside the occurrence's current sequence; dragging never changes its operand."
+                .into(),
+        );
     }
+    let mut steps = p.elements[&slot.parent]
+        .steps()
+        .expect("slot validated")
+        .clone();
+    let from = steps
+        .iter()
+        .position(|id| *id == occurrence)
+        .ok_or("This occurrence is not in the sequence.")?;
+    steps.remove(from);
+    steps.insert(to - usize::from(from < to), occurrence);
+    let command = Command::SetSteps(slot.parent, steps);
+    execute_batch(p, std::slice::from_ref(&command)).map_err(|error| error.to_string())?;
+    Ok(command)
 }
 fn compatible_binding(p: &Project, referenced: Id, local: Id) -> bool {
     represented(p, referenced)

crates/oa-desktop/src/behavior/scenario/group_removal.rs

@@ -1,182 +0,0 @@
-//! Whole-set local Scenario removal. UI visibility and input lifetime admission
-//! belong to the caller; this planner validates structural identity and semantics.
-use crate::diagram_usage::Target;
-use oa_core::{Command, Id, Kind, Layer, OccurrenceBody, Project, SharedBody, execute_batch};
-use std::collections::{BTreeMap, BTreeSet};
-
-#[derive(Debug)]
-pub(crate) struct Plan {
-    pub(crate) command: Command,
-    /// Actual deleted identities, including owned descendants and dependents.
-    pub(crate) removed: BTreeSet<Id>,
-    /// Surviving records changed by reference clearing, sequence edits or view
-    /// pruning. Embedded surviving placements are included alongside diagrams.
-    pub(crate) changed: BTreeSet<Id>,
-}
-
-fn step_body(project: &Project, id: Id) -> Option<&OccurrenceBody> {
-    match project.elements.get(&id)?.shared()? {
-        SharedBody::Occurrence { body, .. }
-            if matches!(
-                body,
-                OccurrenceBody::Exchange { .. }
-                    | OccurrenceBody::Action { .. }
-                    | OccurrenceBody::State { .. }
-                    | OccurrenceBody::ScenarioUse { .. }
-                    | OccurrenceBody::Fragment { .. }
-            ) =>
-        {
-            Some(body)
-        }
-        _ => None,
-    }
-}
-
-/// Follow the actual ordered/operand lists, not only parent pointers. Check the
-/// complete local tree so malformed siblings cannot become a permissive subset.
-fn local_occurrences(project: &Project, owner: Id, layer: Layer) -> Result<BTreeSet<Id>, String> {
-    let mut reachable = BTreeSet::new();
-    let mut sequences = vec![owner];
-    while let Some(parent) = sequences.pop() {
-        let steps = project.elements[&parent]
-            .steps()
-            .ok_or("The Scenario sequence is no longer available.")?;
-        for &id in steps {
-            let element = project
-                .elements
-                .get(&id)
-                .ok_or("A Scenario step is missing.")?;
-            let body =
-                step_body(project, id).ok_or("The Scenario contains an unsupported step.")?;
-            if element.parent != Some(parent) || element.layer() != layer || !reachable.insert(id) {
-                return Err("The Scenario lists must contain unique local occurrences of their actual parents.".into());
-            }
-            if let OccurrenceBody::Fragment { branches, .. } = body {
-                for &branch in branches {
-                    let element = project
-                        .elements
-                        .get(&branch)
-                        .ok_or("A Scenario operand is missing.")?;
-                    if element.parent != Some(id)
-                        || element.layer() != layer
-                        || !matches!(
-                            element.shared(),
-                            Some(SharedBody::Occurrence {
-                                body: OccurrenceBody::Branch { .. },
-                                ..
-                            })
-                        )
-                        || !reachable.insert(branch)
-                    {
-                        return Err("The Scenario fragment must list each actual local operand exactly once.".into());
-                    }
-                    sequences.push(branch);
-                }
-            }
-        }
-    }
-    Ok(reachable)
-}
-
-fn changed_records<T: PartialEq>(
-    before: &BTreeMap<Id, T>,
-    after: &BTreeMap<Id, T>,
-    changed: &mut BTreeSet<Id>,
-) {
-    changed.extend(
-        before
-            .iter()
-            .filter_map(|(&id, record)| after.get(&id).filter(|next| *next != record).map(|_| id)),
-    );
-}
-
-pub(crate) fn prepare(project: &Project, owner: Id, targets: &[Target]) -> Result<Plan, String> {
-    let owner_element = project
-        .elements
-        .get(&owner)
-        .filter(|element| element.kind() == Kind::Scenario)
-        .ok_or("This Scenario no longer exists.")?;
-    let mut selected = BTreeSet::new();
-    for target in targets {
-        let Target::ScenarioObject(id) = target else {
-            return Err("Remove only local Scenario participants and occurrences together.".into());
-        };
-        if !selected.insert(*id) {
-            return Err("Every selected Scenario subject must be unique.".into());
-        }
-    }
-    if selected.is_empty() {
-        return Err("Select at least one Scenario participant or occurrence to remove.".into());
-    }
-    oa_core::session::validate_candidate(project).map_err(|error| error.to_string())?;
-    let reachable = local_occurrences(project, owner, owner_element.layer())?;
-    for &id in &selected {
-        let element = project
-            .elements
-            .get(&id)
-            .ok_or("A selected Scenario subject no longer exists.")?;
-        let local = if element.kind() == Kind::Lifeline {
-            element.parent == Some(owner) && element.layer() == owner_element.layer()
-        } else {
-            reachable.contains(&id)
-        };
-        if !local {
-            return Err("Every selected subject must be a local participant or a listed occurrence/operand in this Scenario.".into());
-        }
-    }
-    // Admission above includes every original member. An admitted selected
-    // descendant is covered by its selected ancestor's core cascade, not dropped
-    // as an ineligible target. Sending both Delete commands would delete it twice.
-    let roots = selected.iter().copied().filter(|id| {
-        let mut parent = project.elements[id].parent;
-        while let Some(id) = parent {
-            if selected.contains(&id) {
-                return false;
-            }
-            parent = project.elements.get(&id).and_then(|element| element.parent);
-        }
-        true
-    });
-    let command = Command::Batch(roots.map(Command::Delete).collect());
-    // One candidate and one final semantic validation, with no intermediate
-    // Document transactions or singleton validation that can reject a valid union.
-    let candidate = execute_batch(project, std::slice::from_ref(&command))
-        .map_err(|error| error.to_string())?;
-    let retained: BTreeSet<_> = candidate
-        .identities()
-        .into_iter()
-        .map(|(id, _)| id)
-        .collect();
-    let removed: BTreeSet<_> = project
-        .identities()
-        .into_iter()
-        .map(|(id, _)| id)
-        .filter(|id| !retained.contains(id))
-        .collect();
-    if !selected.is_subset(&removed) {
-        return Err("The complete selected set could not be removed.".into());
-    }
-    let mut changed = BTreeSet::new();
-    changed_records(&project.elements, &candidate.elements, &mut changed);
-    changed_records(&project.relations, &candidate.relations, &mut changed);
-    changed_records(&project.diagrams, &candidate.diagrams, &mut changed);
-    changed_records(
-        &project.artifact_links,
-        &candidate.artifact_links,
-        &mut changed,
-    );
-    changed_records(&project.traces, &candidate.traces, &mut changed);
-    for (&id, diagram) in &project.diagrams {
-        if let Some(after) = candidate.diagrams.get(&id) {
-            changed_records(&diagram.nodes, &after.nodes, &mut changed);
-        }
-    }
-    Ok(Plan {
-        command,
-        removed,
-        changed,
-    })
-}
-
-#[cfg(test)]
-mod tests;

crates/oa-desktop/src/behavior/scenario/group_removal/tests.rs

@@ -1,824 +0,0 @@
-use super::*;
-use crate::{behavior::topology::occurrence, document::Document};
-use oa_core::{
-    ArtifactLink, ArtifactRelation, Diagram, DiagramLayout, FragmentOperator, LifelineBinding,
-    MessageKind, OccurrenceEndpoint, Position, ProjectionKind, ScenarioLanePosition,
-    ScenarioLayout, ScenarioMessagePosition, Trace, TraceKind, language,
-};
-
-struct Fixture {
-    project: Project,
-    owner: Id,
-    work: [Id; 2],
-    lanes: [Id; 2],
-    messages: [Id; 2],
-    views: [Id; 2],
-}
-
-fn add(project: &mut Project, parent: Id, name: &str, body: OccurrenceBody) -> Id {
-    let element = occurrence(project, parent, name, body);
-    let id = element.id;
-    project.elements.insert(id, element);
-    project
-        .elements
-        .get_mut(&parent)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(id);
-    id
-}
-
-fn body(project: &mut Project, id: Id) -> &mut OccurrenceBody {
-    let SharedBody::Occurrence { body, .. } =
-        project.elements.get_mut(&id).unwrap().shared_mut().unwrap()
-    else {
-        panic!("occurrence")
-    };
-    body
-}
-
-fn action(project: &mut Project, parent: Id, name: &str) -> Id {
-    add(
-        project,
-        parent,
-        name,
-        OccurrenceBody::Action {
-            action: None,
-            lifeline: None,
-        },
-    )
-}
-
-fn operand(project: &mut Project, fragment: Id, name: &str) -> Id {
-    let element = occurrence(
-        project,
-        fragment,
-        name,
-        OccurrenceBody::Branch {
-            guard: "ready".into(),
-            occurrences: vec![],
-        },
-    );
-    let id = element.id;
-    project.elements.insert(id, element);
-    let OccurrenceBody::Fragment { branches, .. } = body(project, fragment) else {
-        panic!()
-    };
-    branches.push(id);
-    id
-}
-
-fn fixture(layer: Layer) -> Fixture {
-    let mut project = Project::empty();
-    let owner = project
-        .add_element(Kind::Scenario, layer, "Conversation", None)
-        .unwrap();
-    let work = ["Source work", "Target work"].map(|name| {
-        project
-            .add_element(
-                if layer == Layer::Oa {
-                    Kind::Activity
-                } else {
-                    Kind::Function
-                },
-                layer,
-                name,
-                None,
-            )
-            .unwrap()
-    });
-    let lanes = ["Left", "Right"].map(|name| {
-        project
-            .add_element(Kind::Lifeline, layer, name, Some(owner))
-            .unwrap()
-    });
-    for (lane, work) in lanes.into_iter().zip(work) {
-        *project
-            .elements
-            .get_mut(&lane)
-            .unwrap()
-            .shared_mut()
-            .unwrap() = SharedBody::Lifeline {
-            represented: Some(work),
-        };
-    }
-    let messages = ["First", "Second"].map(|name| {
-        add(
-            &mut project,
-            owner,
-            name,
-            OccurrenceBody::Exchange {
-                exchange: None,
-                sender: Some(lanes[0]),
-                receiver: Some(lanes[1]),
-                message_kind: MessageKind::Asynchronous,
-                reply_to: None,
-                values: vec![],
-                operation: None,
-            },
-        )
-    });
-    let views = ["Saved A", "Saved B"].map(|name| {
-        let id = Id::new_v4();
-        project.diagrams.insert(
-            id,
-            Diagram {
-                id,
-                alias: project.fresh_alias(name, "view", id),
-                name: name.into(),
-                description: "Keep authored metadata".into(),
-                layer,
-                projection: ProjectionKind::Scenario { scenario: owner },
-                view_options: Default::default(),
-                nodes: Default::default(),
-                routes: vec![],
-                layout: Some(DiagramLayout::Scenario(ScenarioLayout {
-                    lanes: vec![
-                        ScenarioLanePosition {
-                            lifeline: lanes[0],
-                            x: 140.,
-                        },
-                        ScenarioLanePosition {
-                            lifeline: lanes[1],
-                            x: 540.,
-                        },
-                    ],
-                    messages: messages
-                        .iter()
-                        .enumerate()
-                        .map(|(index, &occurrence)| ScenarioMessagePosition {
-                            address: OccurrenceEndpoint {
-                                occurrence,
-                                references: vec![],
-                            },
-                            send_y: 220. + index as f32 * 160.,
-                        })
-                        .collect(),
-                })),
-            },
-        );
-        id
-    });
-    oa_core::session::validate_candidate(&project).unwrap();
-    Fixture {
-        project,
-        owner,
-        work,
-        lanes,
-        messages,
-        views,
-    }
-}
-
-fn selected(ids: &[Id]) -> Vec<Target> {
-    ids.iter().copied().map(Target::ScenarioObject).collect()
-}
-
-fn layout(project: &mut Project, diagram: Id) -> &mut ScenarioLayout {
-    let Some(DiagramLayout::Scenario(layout)) =
-        &mut project.diagrams.get_mut(&diagram).unwrap().layout
-    else {
-        panic!()
-    };
-    layout
-}
-
-fn exact_transaction(project: &Project, plan: Plan, expected: &Project) {
-    assert!(matches!(plan.command, Command::Batch(_)));
-    assert_eq!(
-        &execute_batch(project, std::slice::from_ref(&plan.command)).unwrap(),
-        expected
-    );
-    let mut document = Document::from_project(project.clone(), Default::default()).unwrap();
-    let original = document.bundle().clone();
-    document.execute(plan.command).unwrap();
-    assert_eq!(document.project(), expected);
-    let changed = document.bundle().clone();
-    assert_eq!(
-        language::parse(&language::format(expected)).unwrap(),
-        *expected
-    );
-    assert_eq!(
-        Document::from_bundle(changed.clone(), Default::default())
-            .unwrap()
-            .project(),
-        expected
-    );
-    assert!(document.undo());
-    assert_eq!(document.project(), project);
-    assert_eq!(document.bundle(), &original);
-    assert!(!document.can_undo());
-    assert!(document.redo());
-    assert_eq!(document.project(), expected);
-    assert_eq!(document.bundle(), &changed);
-    assert!(!document.can_redo());
-}
-
-#[test]
-fn whole_messages_in_both_layers_preserve_definitions_and_exact_source_history() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let f = fixture(layer);
-        let baseline = f.project.clone();
-        let plan = prepare(&f.project, f.owner, &selected(&f.messages)).unwrap();
-        let reversed = prepare(
-            &f.project,
-            f.owner,
-            &selected(&[f.messages[1], f.messages[0]]),
-        )
-        .unwrap();
-        assert_eq!(plan.command, reversed.command);
-        assert_eq!(plan.removed, f.messages.into_iter().collect());
-        assert_eq!(
-            plan.changed,
-            [f.owner, f.views[0], f.views[1]].into_iter().collect()
-        );
-        let mut expected = f.project.clone();
-        for id in f.messages {
-            expected.elements.remove(&id);
-        }
-        expected
-            .elements
-            .get_mut(&f.owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap()
-            .clear();
-        for view in f.views {
-            layout(&mut expected, view).messages.clear();
-        }
-        for id in f.work {
-            assert_eq!(expected.elements[&id], f.project.elements[&id]);
-        }
-        assert_eq!(f.project, baseline, "preparation is pure");
-        exact_transaction(&f.project, plan, &expected);
-    }
-}
-
-#[test]
-fn mixed_participant_and_message_union_clears_surviving_references_and_prunes_both_views() {
-    let mut f = fixture(Layer::Oa);
-    let local_action = add(
-        &mut f.project,
-        f.owner,
-        "Local action",
-        OccurrenceBody::Action {
-            action: Some(f.work[0]),
-            lifeline: Some(f.lanes[0]),
-        },
-    );
-    let observation = add(
-        &mut f.project,
-        f.owner,
-        "Observation",
-        OccurrenceBody::State {
-            state: None,
-            lifeline: Some(f.lanes[0]),
-        },
-    );
-    let definition = f
-        .project
-        .add_element(Kind::Scenario, Layer::Oa, "Reused definition", None)
-        .unwrap();
-    let remote = f
-        .project
-        .add_element(
-            Kind::Lifeline,
-            Layer::Oa,
-            "Remote participant",
-            Some(definition),
-        )
-        .unwrap();
-    *f.project
-        .elements
-        .get_mut(&remote)
-        .unwrap()
-        .shared_mut()
-        .unwrap() = SharedBody::Lifeline {
-        represented: Some(f.work[0]),
-    };
-    let use_id = add(
-        &mut f.project,
-        f.owner,
-        "Use definition",
-        OccurrenceBody::ScenarioUse {
-            scenario: Some(definition),
-            bindings: vec![LifelineBinding {
-                referenced: remote,
-                local: f.lanes[0],
-            }],
-        },
-    );
-    oa_core::session::validate_candidate(&f.project).unwrap();
-    let plan = prepare(&f.project, f.owner, &selected(&[f.lanes[0], f.messages[0]])).unwrap();
-    let mut expected = f.project.clone();
-    expected.elements.remove(&f.lanes[0]);
-    expected.elements.remove(&f.messages[0]);
-    *expected
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap() = vec![f.messages[1], local_action, observation, use_id];
-    let OccurrenceBody::Exchange { sender, .. } = body(&mut expected, f.messages[1]) else {
-        panic!()
-    };
-    *sender = None;
-    let OccurrenceBody::Action { lifeline, .. } = body(&mut expected, local_action) else {
-        panic!()
-    };
-    *lifeline = None;
-    let OccurrenceBody::State { lifeline, .. } = body(&mut expected, observation) else {
-        panic!()
-    };
-    *lifeline = None;
-    let OccurrenceBody::ScenarioUse { bindings, .. } = body(&mut expected, use_id) else {
-        panic!()
-    };
-    bindings.clear();
-    for view in f.views {
-        let rows = layout(&mut expected, view);
-        rows.lanes.remove(0);
-        rows.messages.remove(0);
-    }
-    assert_eq!(
-        plan.removed,
-        [f.lanes[0], f.messages[0]].into_iter().collect()
-    );
-    assert_eq!(
-        plan.changed,
-        [
-            f.owner,
-            f.messages[1],
-            local_action,
-            observation,
-            use_id,
-            f.views[0],
-            f.views[1]
-        ]
-        .into_iter()
-        .collect()
-    );
-    assert_eq!(
-        expected.elements[&definition],
-        f.project.elements[&definition]
-    );
-    assert_eq!(expected.elements[&remote], f.project.elements[&remote]);
-    exact_transaction(&f.project, plan, &expected);
-}
-
-#[test]
-fn call_removal_keeps_reply_as_warning_admitted_draft_and_reports_its_changed_identity() {
-    let mut f = fixture(Layer::Oa);
-    let OccurrenceBody::Exchange { message_kind, .. } = body(&mut f.project, f.messages[0]) else {
-        panic!()
-    };
-    *message_kind = MessageKind::Call;
-    let OccurrenceBody::Exchange {
-        sender,
-        receiver,
-        message_kind,
-        reply_to,
-        ..
-    } = body(&mut f.project, f.messages[1])
-    else {
-        panic!()
-    };
-    *sender = Some(f.lanes[1]);
-    *receiver = Some(f.lanes[0]);
-    *message_kind = MessageKind::Reply;
-    *reply_to = Some(f.messages[0]);
-    oa_core::session::validate_candidate(&f.project).unwrap();
-    let plan = prepare(&f.project, f.owner, &selected(&[f.messages[0], f.lanes[1]])).unwrap();
-    let mut expected = f.project.clone();
-    expected.elements.remove(&f.messages[0]);
-    expected.elements.remove(&f.lanes[1]);
-    *expected
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap() = vec![f.messages[1]];
-    let OccurrenceBody::Exchange {
-        sender, reply_to, ..
-    } = body(&mut expected, f.messages[1])
-    else {
-        panic!()
-    };
-    *sender = None;
-    *reply_to = None;
-    for view in f.views {
-        let rows = layout(&mut expected, view);
-        rows.lanes.remove(1);
-        rows.messages.remove(0);
-    }
-    assert_eq!(
-        plan.removed,
-        [f.messages[0], f.lanes[1]].into_iter().collect()
-    );
-    assert_eq!(
-        plan.changed,
-        [f.owner, f.messages[1], f.views[0], f.views[1]]
-            .into_iter()
-            .collect()
-    );
-    assert!(
-        oa_core::validation::validate(&expected)
-            .iter()
-            .any(|issue| issue.code == "missing_reply_call"
-                && issue.severity == oa_core::validation::Severity::Warning)
-    );
-    exact_transaction(&f.project, plan, &expected);
-}
-
-fn nested(f: &mut Fixture) -> (Id, [Id; 2], [Id; 2]) {
-    let fragment = add(
-        &mut f.project,
-        f.owner,
-        "Alternatives",
-        OccurrenceBody::Fragment {
-            operator: FragmentOperator::Alternative,
-            branches: vec![],
-        },
-    );
-    let branches = [
-        operand(&mut f.project, fragment, "Left operand"),
-        operand(&mut f.project, fragment, "Right operand"),
-    ];
-    let children = [
-        action(&mut f.project, branches[0], "Left action"),
-        action(&mut f.project, branches[1], "Right action"),
-    ];
-    (fragment, branches, children)
-}
-
-#[test]
-fn selected_ancestor_covers_all_descendants_after_admission_and_executes_once() {
-    let mut f = fixture(Layer::Oa);
-    let (fragment, branches, children) = nested(&mut f);
-    oa_core::session::validate_candidate(&f.project).unwrap();
-    assert!(
-        execute_batch(
-            &f.project,
-            &[Command::Delete(fragment), Command::Delete(children[0])]
-        )
-        .is_err(),
-        "naive cascading singleton deletes are order-dependent"
-    );
-    let members = [children[0], f.messages[1], fragment, branches[0]];
-    let plan = prepare(&f.project, f.owner, &selected(&members)).unwrap();
-    let roots: BTreeSet<_> = [fragment, f.messages[1]].into_iter().collect();
-    assert_eq!(
-        plan.command,
-        Command::Batch(roots.into_iter().map(Command::Delete).collect())
-    );
-    let removed = [
-        fragment,
-        branches[0],
-        branches[1],
-        children[0],
-        children[1],
-        f.messages[1],
-    ];
-    assert_eq!(plan.removed, removed.into_iter().collect());
-    assert_eq!(
-        plan.changed,
-        [f.owner, f.views[0], f.views[1]].into_iter().collect()
-    );
-    let mut expected = f.project.clone();
-    for id in removed {
-        expected.elements.remove(&id);
-    }
-    *expected
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap() = vec![f.messages[0]];
-    for view in f.views {
-        layout(&mut expected, view).messages.remove(1);
-    }
-    exact_transaction(&f.project, plan, &expected);
-}
-
-#[test]
-fn independent_operands_can_be_removed_together_without_a_reorder_parent_restriction() {
-    let mut f = fixture(Layer::Sa);
-    let (fragment, branches, children) = nested(&mut f);
-    let plan = prepare(
-        &f.project,
-        f.owner,
-        &selected(&[children[1], f.messages[0], children[0]]),
-    )
-    .unwrap();
-    let mut expected = f.project.clone();
-    for id in [children[0], children[1], f.messages[0]] {
-        expected.elements.remove(&id);
-    }
-    for branch in branches {
-        expected
-            .elements
-            .get_mut(&branch)
-            .unwrap()
-            .steps_mut()
-            .unwrap()
-            .clear();
-    }
-    *expected
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap() = vec![f.messages[1], fragment];
-    for view in f.views {
-        layout(&mut expected, view).messages.remove(0);
-    }
-    assert_eq!(
-        plan.changed,
-        [f.owner, branches[0], branches[1], f.views[0], f.views[1]]
-            .into_iter()
-            .collect()
-    );
-    exact_transaction(&f.project, plan, &expected);
-}
-
-#[test]
-fn branch_and_use_are_local_removal_targets_and_reused_definition_survives() {
-    let mut f = fixture(Layer::Oa);
-    let (fragment, branches, children) = nested(&mut f);
-    let definition = f
-        .project
-        .add_element(Kind::Scenario, Layer::Oa, "Definition", None)
-        .unwrap();
-    let use_id = add(
-        &mut f.project,
-        f.owner,
-        "Use",
-        OccurrenceBody::ScenarioUse {
-            scenario: Some(definition),
-            bindings: vec![],
-        },
-    );
-    let plan = prepare(&f.project, f.owner, &selected(&[branches[0], use_id])).unwrap();
-    let mut expected = f.project.clone();
-    for id in [branches[0], children[0], use_id] {
-        expected.elements.remove(&id);
-    }
-    let OccurrenceBody::Fragment {
-        branches: remaining,
-        ..
-    } = body(&mut expected, fragment)
-    else {
-        panic!()
-    };
-    *remaining = vec![branches[1]];
-    *expected
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap() = vec![f.messages[0], f.messages[1], fragment];
-    assert_eq!(
-        plan.removed,
-        [branches[0], children[0], use_id].into_iter().collect()
-    );
-    assert_eq!(plan.changed, [f.owner, fragment].into_iter().collect());
-    assert_eq!(
-        expected.elements[&definition],
-        f.project.elements[&definition]
-    );
-    exact_transaction(&f.project, plan, &expected);
-}
-
-#[test]
-fn impact_includes_placements_artifacts_traces_and_changed_surviving_constraints() {
-    let mut f = fixture(Layer::Oa);
-    let overview = f.project.ensure_diagram(Layer::Oa);
-    let node = f
-        .project
-        .place(overview, f.messages[0], Position { x: 100., y: 100. });
-    let other_node = f
-        .project
-        .place(overview, f.messages[1], Position { x: 400., y: 100. });
-    let counterpart = f
-        .project
-        .add_element(
-            Kind::Function,
-            Layer::Sa,
-            "Opposite-layer counterpart",
-            None,
-        )
-        .unwrap();
-    let trace = Id::new_v4();
-    f.project.traces.insert(
-        trace,
-        Trace {
-            id: trace,
-            alias: "manual_trace".into(),
-            name: "Manual trace".into(),
-            description: String::new(),
-            oa: f.messages[0],
-            sa: counterpart,
-            kind: TraceKind::Manual,
-            baseline: None,
-        },
-    );
-    let artifact = Id::new_v4();
-    f.project.artifact_links.insert(
-        artifact,
-        ArtifactLink {
-            id: artifact,
-            alias: "evidence".into(),
-            name: "Evidence".into(),
-            description: String::new(),
-            owner: f.messages[0],
-            relation: ArtifactRelation::References,
-            uri: "evidence.txt".into(),
-            revision: None,
-            fragment: None,
-        },
-    );
-    let constraint = f
-        .project
-        .add_element(Kind::Constraint, Layer::Oa, "Constraint", None)
-        .unwrap();
-    *f.project
-        .elements
-        .get_mut(&constraint)
-        .unwrap()
-        .shared_mut()
-        .unwrap() = SharedBody::Constraint {
-        expression: "review".into(),
-        constrained: f.messages.to_vec(),
-    };
-    oa_core::session::validate_candidate(&f.project).unwrap();
-    let plan = prepare(&f.project, f.owner, &selected(&[f.messages[0]])).unwrap();
-    let mut expected = f.project.clone();
-    expected.elements.remove(&f.messages[0]);
-    expected.traces.remove(&trace);
-    expected.artifact_links.remove(&artifact);
-    expected
-        .diagrams
-        .get_mut(&overview)
-        .unwrap()
-        .nodes
-        .remove(&node);
-    *expected
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap() = vec![f.messages[1]];
-    let SharedBody::Constraint { constrained, .. } = expected
-        .elements
-        .get_mut(&constraint)
-        .unwrap()
-        .shared_mut()
-        .unwrap()
-    else {
-        panic!()
-    };
-    *constrained = vec![f.messages[1]];
-    for view in f.views {
-        layout(&mut expected, view).messages.remove(0);
-    }
-    assert_eq!(
-        plan.removed,
-        [f.messages[0], node, trace, artifact].into_iter().collect()
-    );
-    assert_eq!(
-        plan.changed,
-        [f.owner, constraint, overview, f.views[0], f.views[1]]
-            .into_iter()
-            .collect()
-    );
-    assert_eq!(
-        expected.elements[&counterpart],
-        f.project.elements[&counterpart]
-    );
-    assert_eq!(
-        expected.diagrams[&overview].nodes[&other_node],
-        f.project.diagrams[&overview].nodes[&other_node]
-    );
-    exact_transaction(&f.project, plan, &expected);
-}
-
-#[test]
-fn whole_typed_selection_refuses_missing_foreign_definitions_and_duplicates_before_collapse() {
-    let mut f = fixture(Layer::Oa);
-    let (fragment, _, children) = nested(&mut f);
-    let other = f
-        .project
-        .add_element(Kind::Scenario, Layer::Oa, "Other", None)
-        .unwrap();
-    let foreign = f
-        .project
-        .add_element(Kind::Lifeline, Layer::Oa, "Foreign", Some(other))
-        .unwrap();
-    for targets in [
-        vec![],
-        vec![Target::Whole],
-        selected(&[f.messages[0], f.messages[0]]),
-        selected(&[f.messages[0], Id::nil()]),
-        selected(&[f.messages[0], f.owner]),
-        selected(&[f.messages[0], f.work[0]]),
-        selected(&[f.messages[0], foreign]),
-        vec![
-            Target::ScenarioObject(f.messages[0]),
-            Target::ProcessOccurrence(OccurrenceEndpoint {
-                occurrence: f.messages[1],
-                references: vec![],
-            }),
-        ],
-        selected(&[fragment, children[0], children[0]]),
-        selected(&[fragment, Id::nil()]),
-    ] {
-        let original = f.project.clone();
-        assert!(prepare(&f.project, f.owner, &targets).is_err());
-        assert_eq!(f.project, original);
-    }
-    assert!(prepare(&f.project, f.work[0], &selected(&f.messages)).is_err());
-}
-
-#[test]
-fn actual_list_reachability_and_complete_siblings_are_required() {
-    let mut f = fixture(Layer::Oa);
-    let (fragment, branches, children) = nested(&mut f);
-    let mut cases = Vec::new();
-    let mut missing_branch = f.project.clone();
-    let OccurrenceBody::Fragment {
-        branches: listed, ..
-    } = body(&mut missing_branch, fragment)
-    else {
-        panic!()
-    };
-    listed.clear();
-    cases.push(missing_branch);
-    let mut unlisted_child = f.project.clone();
-    unlisted_child
-        .elements
-        .get_mut(&branches[0])
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .clear();
-    cases.push(unlisted_child);
-    let mut dangling_sibling = f.project.clone();
-    dangling_sibling
-        .elements
-        .get_mut(&branches[1])
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(Id::new_v4());
-    cases.push(dangling_sibling);
-    let mut duplicate_sibling = f.project.clone();
-    duplicate_sibling
-        .elements
-        .get_mut(&branches[1])
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(children[1]);
-    cases.push(duplicate_sibling);
-    let mut wrong_parent = f.project.clone();
-    wrong_parent.elements.get_mut(&children[0]).unwrap().parent = Some(branches[1]);
-    cases.push(wrong_parent);
-    for project in cases {
-        assert!(
-            prepare(&project, f.owner, &selected(&[fragment, children[0]])).is_err(),
-            "ancestor coverage never conceals an invalid original member/tree"
-        );
-    }
-}
-
-#[test]
-fn invalid_baseline_cannot_be_silently_repaired_and_refusal_preserves_existing_redo() {
-    let f = fixture(Layer::Oa);
-    let mut invalid = f.project.clone();
-    let duplicate_alias = invalid.elements[&f.owner].alias.clone();
-    invalid.elements.get_mut(&f.messages[0]).unwrap().alias = duplicate_alias;
-    assert!(oa_core::session::validate_candidate(&invalid).is_err());
-    // The final deletion could repair this error, but the planner must admit a
-    // valid original baseline rather than quietly using deletion as repair.
-    assert!(execute_batch(&invalid, &[Command::Delete(f.messages[0])]).is_ok());
-    assert!(prepare(&invalid, f.owner, &selected(&[f.messages[0]])).is_err());
-    let mut document = Document::from_project(f.project.clone(), Default::default()).unwrap();
-    document
-        .execute(Command::Rename(f.messages[1], "Prior edit".into()))
-        .unwrap();
-    assert!(document.undo());
-    let before = document.bundle().clone();
-    let revision = document.revision();
-    assert!(
-        prepare(
-            document.project(),
-            f.owner,
-            &selected(&[f.messages[0], f.work[0]])
-        )
-        .is_err()
-    );
-    assert_eq!(document.bundle(), &before);
-    assert_eq!(document.revision(), revision);
-    assert!(document.can_redo());
-}

crates/oa-desktop/src/behavior/scenario/group_reorder.rs

@@ -1,179 +0,0 @@
-//! Frozen, all-or-nothing reorder of one immediate Scenario sequence.
-use super::Slot;
-use crate::diagram_usage::Target;
-use oa_core::{Command, Id, Kind, OccurrenceBody, Project, SharedBody, execute_batch};
-use std::{collections::BTreeSet, sync::Arc};
-
-#[derive(Debug)]
-pub(crate) enum Plan {
-    Noop,
-    Change(Box<Command>),
-}
-
-pub(crate) struct Prepared {
-    project: Arc<Project>,
-    parent: Id,
-    original: Vec<Id>,
-    selected: BTreeSet<Id>,
-}
-
-fn step_body(project: &Project, id: Id) -> Option<&OccurrenceBody> {
-    match project.elements.get(&id)?.shared()? {
-        SharedBody::Occurrence { body, .. }
-            if matches!(
-                body,
-                OccurrenceBody::Exchange { .. }
-                    | OccurrenceBody::Action { .. }
-                    | OccurrenceBody::State { .. }
-                    | OccurrenceBody::ScenarioUse { .. }
-                    | OccurrenceBody::Fragment { .. }
-            ) =>
-        {
-            Some(body)
-        }
-        _ => None,
-    }
-}
-
-// Follow the same structural edges that make rows visible; parent pointers alone
-// would admit children of an operand omitted from its fragment's branch list.
-fn reachable_parent(project: &Project, owner: Id, wanted: Id) -> bool {
-    let mut pending = vec![owner];
-    let mut visited = BTreeSet::new();
-    while let Some(parent) = pending.pop() {
-        if !visited.insert(parent) {
-            continue;
-        }
-        if parent == wanted {
-            return true;
-        }
-        let Some(steps) = project.elements.get(&parent).and_then(|e| e.steps()) else {
-            continue;
-        };
-        for id in steps {
-            if project.elements.get(id).and_then(|e| e.parent) != Some(parent) {
-                continue;
-            }
-            if let Some(OccurrenceBody::Fragment { branches, .. }) = step_body(project, *id) {
-                pending.extend(branches.iter().copied().filter(|branch| {
-                    project.elements.get(branch).is_some_and(|element| {
-                        element.parent == Some(*id)
-                            && matches!(
-                                element.shared(),
-                                Some(SharedBody::Occurrence {
-                                    body: OccurrenceBody::Branch { .. },
-                                    ..
-                                })
-                            )
-                    })
-                }));
-            }
-        }
-    }
-    false
-}
-
-impl Prepared {
-    pub(crate) fn new(
-        project: Arc<Project>,
-        owner: Id,
-        targets: &[Target],
-    ) -> Result<Self, String> {
-        if project.elements.get(&owner).map(|e| e.kind()) != Some(Kind::Scenario) {
-            return Err("This scenario no longer exists.".into());
-        }
-        let mut selected = BTreeSet::new();
-        let mut parent = None;
-        for target in targets {
-            let Target::ScenarioObject(id) = target else {
-                return Err("Select only ordered occurrences in this scenario.".into());
-            };
-            if !selected.insert(*id) || step_body(&project, *id).is_none() {
-                return Err(
-                    "Every selected subject must be a unique ordered scenario occurrence.".into(),
-                );
-            }
-            let actual = project.elements[id]
-                .parent
-                .ok_or("The occurrence has no sequence.")?;
-            if parent.is_some_and(|parent| parent != actual) {
-                return Err(
-                    "Reorder inside one immediate sequence; dragging never changes operands."
-                        .into(),
-                );
-            }
-            parent = Some(actual);
-        }
-        let parent = parent.ok_or("Select at least one occurrence.")?;
-        if !reachable_parent(&project, owner, parent) {
-            return Err("The selected sequence is not reachable in this scenario.".into());
-        }
-        let original = project.elements[&parent]
-            .steps()
-            .ok_or("The parent is not a sequence.")?
-            .clone();
-        let mut listed = BTreeSet::new();
-        for id in &original {
-            if !listed.insert(*id)
-                || step_body(&project, *id).is_none()
-                || project.elements[id].parent != Some(parent)
-            {
-                return Err("The complete sequence must contain unique, existing occurrences of this parent.".into());
-            }
-        }
-        if !selected.is_subset(&listed) {
-            return Err("A selected occurrence is not in this sequence.".into());
-        }
-        // Cache a validated immutable baseline, including descendants and other
-        // sequences. Advisory authoring diagnostics deliberately remain allowed.
-        oa_core::session::validate_candidate(&project).map_err(|e| e.to_string())?;
-        Ok(Self {
-            project,
-            parent,
-            original,
-            selected,
-        })
-    }
-
-    pub(crate) fn plan(&self, slot: Slot) -> Result<Plan, String> {
-        if slot.parent != self.parent {
-            return Err("Reorder inside the occurrence's current sequence; dragging never changes its operand.".into());
-        }
-        if let Some(anchor) = slot.before {
-            if !self.original.contains(&anchor) {
-                return Err("The insertion slot changed. Choose its position again.".into());
-            }
-            if self.selected.contains(&anchor) {
-                return Ok(Plan::Noop);
-            }
-        }
-        let mut steps: Vec<_> = self
-            .original
-            .iter()
-            .copied()
-            .filter(|id| !self.selected.contains(id))
-            .collect();
-        let at = slot.before.map_or(steps.len(), |anchor| {
-            steps
-                .iter()
-                .position(|id| *id == anchor)
-                .expect("admitted anchor")
-        });
-        steps.splice(
-            at..at,
-            self.original
-                .iter()
-                .copied()
-                .filter(|id| self.selected.contains(id)),
-        );
-        if steps == self.original {
-            return Ok(Plan::Noop);
-        }
-        let command = Command::SetSteps(self.parent, steps);
-        execute_batch(&self.project, std::slice::from_ref(&command)).map_err(|e| e.to_string())?;
-        Ok(Plan::Change(Box::new(command)))
-    }
-}
-
-#[cfg(test)]
-mod tests;

crates/oa-desktop/src/behavior/scenario/group_reorder/tests.rs

@@ -1,720 +0,0 @@
-use super::*;
-use crate::{behavior::topology::occurrence, document::Document};
-use oa_core::{FragmentOperator, Layer, LifelineBinding, MessageKind, language};
-
-fn add(p: &mut Project, parent: Id, name: &str, body: OccurrenceBody) -> Id {
-    let e = occurrence(p, parent, name, body);
-    let id = e.id;
-    p.elements.insert(id, e);
-    p.elements
-        .get_mut(&parent)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(id);
-    id
-}
-fn row(p: &mut Project, parent: Id, name: &str) -> Id {
-    add(
-        p,
-        parent,
-        name,
-        OccurrenceBody::Action {
-            action: None,
-            lifeline: None,
-        },
-    )
-}
-fn operand(p: &mut Project, parent: Id, operator: FragmentOperator) -> (Id, Id) {
-    let fragment = add(
-        p,
-        parent,
-        "Fragment",
-        OccurrenceBody::Fragment {
-            operator,
-            branches: vec![],
-        },
-    );
-    let branch = occurrence(
-        p,
-        fragment,
-        "Operand",
-        OccurrenceBody::Branch {
-            guard: "ready".into(),
-            occurrences: vec![],
-        },
-    );
-    let id = branch.id;
-    p.elements.insert(id, branch);
-    if let Some(SharedBody::Occurrence {
-        body: OccurrenceBody::Fragment { branches, .. },
-        ..
-    }) = p.elements.get_mut(&fragment).unwrap().shared_mut()
-    {
-        branches.push(id);
-    }
-    (fragment, id)
-}
-fn prepare(p: &Project, owner: Id, ids: &[Id]) -> Result<Prepared, String> {
-    Prepared::new(
-        Arc::new(p.clone()),
-        owner,
-        &ids.iter()
-            .copied()
-            .map(Target::ScenarioObject)
-            .collect::<Vec<_>>(),
-    )
-}
-fn slot(parent: Id, before: Option<Id>) -> Slot {
-    Slot { parent, before }
-}
-fn ordered(p: &Project, parent: Id, ids: &[Id]) -> Project {
-    let mut expected = p.clone();
-    *expected
-        .elements
-        .get_mut(&parent)
-        .unwrap()
-        .steps_mut()
-        .unwrap() = ids.to_vec();
-    expected
-}
-fn exact_transaction(p: &Project, plan: Plan, expected: Project) {
-    let Plan::Change(command) = plan else {
-        panic!("expected a change")
-    };
-    assert_eq!(
-        execute_batch(p, std::slice::from_ref(&command)).unwrap(),
-        expected
-    );
-    let mut doc = Document::from_project(p.clone(), Default::default()).unwrap();
-    let original_source = doc.bundle().clone();
-    doc.execute(*command).unwrap();
-    assert_eq!(doc.project(), &expected);
-    assert_eq!(
-        language::parse(&language::format(doc.project())).unwrap(),
-        expected
-    );
-    let changed_source = doc.bundle().clone();
-    assert_eq!(
-        Document::from_bundle(changed_source.clone(), Default::default())
-            .unwrap()
-            .project(),
-        &expected
-    );
-    assert!(doc.undo());
-    assert_eq!(doc.project(), p);
-    assert_eq!(doc.bundle(), &original_source);
-    assert!(!doc.can_undo());
-    assert!(doc.redo());
-    assert_eq!(doc.project(), &expected);
-    assert_eq!(doc.bundle(), &changed_source);
-    assert!(!doc.can_redo());
-}
-fn four(nested: bool) -> (Project, Id, Id, [Id; 4]) {
-    four_in_layer(nested, Layer::Oa)
-}
-fn four_in_layer(nested: bool, layer: Layer) -> (Project, Id, Id, [Id; 4]) {
-    let mut p = Project::empty();
-    let owner = p
-        .add_element(oa_core::Kind::Scenario, layer, "Scenario", None)
-        .unwrap();
-    let parent = if nested {
-        operand(&mut p, owner, FragmentOperator::Alternative).1
-    } else {
-        owner
-    };
-    let ids = ["A", "B", "C", "D"].map(|name| row(&mut p, parent, name));
-    oa_core::session::validate_candidate(&p).unwrap();
-    (p, owner, parent, ids)
-}
-
-#[test]
-fn root_and_operand_use_semantic_block_order_with_exact_history() {
-    for (nested, layer) in [
-        (false, Layer::Oa),
-        (true, Layer::Oa),
-        (false, Layer::Sa),
-        (true, Layer::Sa),
-    ] {
-        let (p, owner, parent, [a, b, c, d]) = four_in_layer(nested, layer);
-        let prepared = prepare(&p, owner, &[c, a]).unwrap();
-        exact_transaction(
-            &p,
-            prepared.plan(slot(parent, Some(d))).unwrap(),
-            ordered(&p, parent, &[b, a, c, d]),
-        );
-        exact_transaction(
-            &p,
-            prepared.plan(slot(parent, None)).unwrap(),
-            ordered(&p, parent, &[b, d, a, c]),
-        );
-    }
-}
-
-#[test]
-fn singleton_wrapper_noop_preserves_existing_redo_and_source() {
-    for nested in [false, true] {
-        let (p, owner, parent, [a, b, c, d]) = four(nested);
-        let mut doc = Document::from_project(p.clone(), Default::default()).unwrap();
-        let change = super::super::reorder(doc.project(), owner, a, slot(parent, None)).unwrap();
-        doc.execute(change).unwrap();
-        assert_eq!(doc.project(), &ordered(&p, parent, &[b, c, d, a]));
-        let changed = doc.bundle().clone();
-        assert!(doc.undo());
-        let source = doc.bundle().clone();
-        let revision = doc.revision();
-        for before in [Some(a), Some(b)] {
-            let noop =
-                super::super::reorder(doc.project(), owner, a, slot(parent, before)).unwrap();
-            doc.execute(noop).unwrap();
-            assert_eq!(doc.project(), &p);
-            assert_eq!(doc.bundle(), &source);
-            assert_eq!(doc.revision(), revision);
-            assert!(!doc.can_undo());
-            assert!(doc.can_redo());
-        }
-        assert!(doc.redo());
-        assert_eq!(doc.bundle(), &changed);
-    }
-}
-
-#[test]
-fn selected_anchor_and_exact_noop_preserve_redo_and_frozen_snapshot() {
-    let (p, owner, parent, [a, b, c, d]) = four(false);
-    let prepared = prepare(&p, owner, &[c, a]).unwrap();
-    let mut doc = Document::from_project(p.clone(), Default::default()).unwrap();
-    let Plan::Change(command) = prepared.plan(slot(parent, Some(d))).unwrap() else {
-        panic!()
-    };
-    doc.execute(*command).unwrap();
-    let changed = doc.bundle().clone();
-    assert!(doc.undo());
-    let source = doc.bundle().clone();
-    let revision = doc.revision();
-    for plan in [
-        prepared.plan(slot(parent, Some(c))),
-        prepare(&p, owner, &[a])
-            .unwrap()
-            .plan(slot(parent, Some(b))),
-        prepare(&p, owner, &[c, d])
-            .unwrap()
-            .plan(slot(parent, None)),
-    ] {
-        assert!(matches!(plan.unwrap(), Plan::Noop));
-        assert_eq!(doc.project(), &p);
-        assert_eq!(doc.bundle(), &source);
-        assert_eq!(doc.revision(), revision);
-        assert!(doc.can_redo());
-    }
-    assert!(doc.redo());
-    assert_eq!(doc.bundle(), &changed);
-    // The earlier prepared value still plans from its original owned snapshot.
-    exact_transaction(
-        &p,
-        prepared.plan(slot(parent, Some(d))).unwrap(),
-        ordered(&p, parent, &[b, a, c, d]),
-    );
-}
-
-#[test]
-fn admission_rejects_every_invalid_member_list_and_destination_before_noop() {
-    let (p, owner, parent, [a, b, c, d]) = four(false);
-    for ids in [vec![], vec![a, a], vec![a, Id::new_v4()]] {
-        assert!(prepare(&p, owner, &ids).is_err());
-    }
-    for target in [Target::Whole, Target::Placement(a)] {
-        assert!(
-            Prepared::new(
-                Arc::new(p.clone()),
-                owner,
-                &[Target::ScenarioObject(a), target]
-            )
-            .is_err()
-        );
-    }
-    let mut with_line = p.clone();
-    let line = with_line
-        .add_element(Kind::Lifeline, Layer::Oa, "Line", Some(owner))
-        .unwrap();
-    assert!(prepare(&with_line, owner, &[a, line]).is_err());
-    let mut nested = p.clone();
-    let (fragment, branch) = operand(&mut nested, owner, FragmentOperator::Alternative);
-    let child = row(&mut nested, branch, "Child");
-    assert!(prepare(&nested, owner, &[a, child]).is_err());
-    assert!(prepare(&nested, owner, &[fragment, child]).is_err());
-    let prepared = prepare(&p, owner, &[a, c]).unwrap();
-    assert!(prepared.plan(slot(branch, Some(a))).is_err());
-    assert!(prepared.plan(slot(parent, Some(Id::new_v4()))).is_err());
-    for list in [vec![a, b, c, b], vec![a, Id::new_v4(), c, d]] {
-        assert!(prepare(&ordered(&p, parent, &list), owner, &[a, c]).is_err());
-    }
-    let mut wrong_parent = p.clone();
-    wrong_parent.elements.get_mut(&b).unwrap().parent = Some(branch);
-    assert!(prepare(&wrong_parent, owner, &[a, c]).is_err());
-    for body in [
-        OccurrenceBody::Control {
-            kind: oa_core::ControlKind::Choice,
-        },
-        OccurrenceBody::SequenceReference { sequence: None },
-    ] {
-        let mut wrong_type = p.clone();
-        if let Some(SharedBody::Occurrence { body: actual, .. }) =
-            wrong_type.elements.get_mut(&b).unwrap().shared_mut()
-        {
-            *actual = body;
-        }
-        assert!(prepare(&wrong_type, owner, &[a, c]).is_err());
-    }
-    if let Some(SharedBody::Occurrence {
-        body: OccurrenceBody::Fragment { branches, .. },
-        ..
-    }) = nested.elements.get_mut(&fragment).unwrap().shared_mut()
-    {
-        branches.clear();
-    }
-    assert!(
-        prepare(&nested, owner, &[child]).is_err(),
-        "parent ancestry cannot admit omitted operand"
-    );
-}
-
-#[test]
-fn unlisted_warning_child_is_preserved_but_cannot_be_selected() {
-    let (mut p, owner, parent, [a, b, c, d]) = four(false);
-    let hidden = row(&mut p, parent, "Hidden draft");
-    p.elements
-        .get_mut(&parent)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .pop();
-    assert!(
-        oa_core::validation::validate(&p)
-            .iter()
-            .any(|i| i.code == "unordered_occurrence")
-    );
-    assert!(prepare(&p, owner, &[hidden]).is_err());
-    exact_transaction(
-        &p,
-        prepare(&p, owner, &[c, a])
-            .unwrap()
-            .plan(slot(parent, Some(d)))
-            .unwrap(),
-        ordered(&p, parent, &[b, a, c, d]),
-    );
-}
-
-#[test]
-fn call_reply_moves_as_explicit_stable_pair_and_invalid_baseline_refuses_noop() {
-    let f = super::super::direct_tests::fixture();
-    let mut p = f.project;
-    let x = row(&mut p, f.owner, "X");
-    let y = row(&mut p, f.owner, "Y");
-    p = ordered(&p, f.owner, &[f.call, x, f.reply, y]);
-    let prepared = prepare(&p, f.owner, &[f.reply, f.call]).unwrap();
-    exact_transaction(
-        &p,
-        prepared.plan(slot(f.owner, None)).unwrap(),
-        ordered(&p, f.owner, &[x, y, f.call, f.reply]),
-    );
-    assert!(
-        prepare(&p, f.owner, &[f.reply])
-            .unwrap()
-            .plan(slot(f.owner, Some(f.call)))
-            .unwrap_err()
-            .contains("reply_order")
-    );
-    let invalid = ordered(&p, f.owner, &[f.reply, x, f.call, y]);
-    assert!(prepare(&invalid, f.owner, &[x]).is_err());
-}
-
-#[test]
-fn nested_fragment_descendant_reply_is_validated_and_subtree_preserved() {
-    let f = super::super::direct_tests::fixture();
-    let mut p = f.project;
-    let x = row(&mut p, f.owner, "X");
-    let (fragment, outer) = operand(&mut p, f.owner, FragmentOperator::Alternative);
-    let (_, inner) = operand(&mut p, outer, FragmentOperator::Parallel);
-    p.elements.get_mut(&f.reply).unwrap().parent = Some(inner);
-    p.elements
-        .get_mut(&inner)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(f.reply);
-    let y = row(&mut p, f.owner, "Y");
-    p = ordered(&p, f.owner, &[f.call, x, fragment, y]);
-    let prepared = prepare(&p, f.owner, &[fragment, x]).unwrap();
-    assert!(
-        prepared
-            .plan(slot(f.owner, Some(f.call)))
-            .unwrap_err()
-            .contains("reply_order")
-    );
-    exact_transaction(
-        &p,
-        prepared.plan(slot(f.owner, None)).unwrap(),
-        ordered(&p, f.owner, &[f.call, y, x, fragment]),
-    );
-}
-
-#[test]
-fn nested_lifetime_and_opaque_local_bindings_are_checked_without_expansion() {
-    let f = super::super::direct_tests::fixture();
-    let mut p = execute_batch(
-        &f.project,
-        &[Command::Delete(f.reply), Command::Delete(f.call)],
-    )
-    .unwrap();
-    let create = add(
-        &mut p,
-        f.owner,
-        "Create",
-        OccurrenceBody::Exchange {
-            exchange: None,
-            sender: Some(f.sender),
-            receiver: Some(f.receiver),
-            message_kind: MessageKind::Create,
-            reply_to: None,
-            values: vec![],
-            operation: None,
-        },
-    );
-    let x = row(&mut p, f.owner, "X");
-    let (fragment, outer) = operand(&mut p, f.owner, FragmentOperator::Alternative);
-    let (_, inner) = operand(&mut p, outer, FragmentOperator::Parallel);
-    add(
-        &mut p,
-        inner,
-        "Use local",
-        OccurrenceBody::Action {
-            action: None,
-            lifeline: Some(f.receiver),
-        },
-    );
-    let y = row(&mut p, f.owner, "Y");
-    let prepared = prepare(&p, f.owner, &[fragment, x]).unwrap();
-    assert!(
-        prepared
-            .plan(slot(f.owner, Some(create)))
-            .unwrap_err()
-            .contains("lifeline_lifetime")
-    );
-    exact_transaction(
-        &p,
-        prepared.plan(slot(f.owner, None)).unwrap(),
-        ordered(&p, f.owner, &[create, y, x, fragment]),
-    );
-    let definition = p
-        .add_element(Kind::Scenario, Layer::Oa, "Definition", None)
-        .unwrap();
-    let represented = match p.elements[&f.receiver].shared().unwrap() {
-        SharedBody::Lifeline { represented } => *represented,
-        _ => panic!(),
-    };
-    let remote = p
-        .add_element(Kind::Lifeline, Layer::Oa, "Formal", Some(definition))
-        .unwrap();
-    *p.elements.get_mut(&remote).unwrap().shared_mut().unwrap() =
-        SharedBody::Lifeline { represented };
-    let uses = ["First use", "Second use"].map(|name| {
-        add(
-            &mut p,
-            f.owner,
-            name,
-            OccurrenceBody::ScenarioUse {
-                scenario: Some(definition),
-                bindings: vec![LifelineBinding {
-                    referenced: remote,
-                    local: f.receiver,
-                }],
-            },
-        )
-    });
-    let prepared = prepare(&p, f.owner, &[uses[1], uses[0]]).unwrap();
-    assert!(
-        prepared
-            .plan(slot(f.owner, Some(create)))
-            .unwrap_err()
-            .contains("lifeline_lifetime")
-    );
-    exact_transaction(
-        &p,
-        prepared.plan(slot(f.owner, Some(x))).unwrap(),
-        ordered(&p, f.owner, &[create, uses[0], uses[1], x, fragment, y]),
-    );
-}
-
-fn delete_line(p: &mut Project, parent: Id, sender: Id, receiver: Id) {
-    add(
-        p,
-        parent,
-        "Delete participant",
-        OccurrenceBody::Exchange {
-            exchange: None,
-            sender: Some(sender),
-            receiver: Some(receiver),
-            message_kind: MessageKind::Delete,
-            reply_to: None,
-            values: vec![],
-            operation: None,
-        },
-    );
-}
-
-fn second_operand(p: &mut Project, fragment: Id) -> Id {
-    let branch = occurrence(
-        p,
-        fragment,
-        "Other operand",
-        OccurrenceBody::Branch {
-            guard: "otherwise".into(),
-            occurrences: vec![],
-        },
-    );
-    let id = branch.id;
-    p.elements.insert(id, branch);
-    let Some(SharedBody::Occurrence {
-        body: OccurrenceBody::Fragment { branches, .. },
-        ..
-    }) = p.elements.get_mut(&fragment).unwrap().shared_mut()
-    else {
-        panic!()
-    };
-    branches.push(id);
-    id
-}
-
-#[test]
-fn conditional_delete_rejects_moving_an_earlier_use_after_the_fragment() {
-    let f = super::super::direct_tests::fixture();
-    let mut p = f.project;
-    let use_line = add(
-        &mut p,
-        f.owner,
-        "Use participant",
-        OccurrenceBody::Action {
-            action: None,
-            lifeline: Some(f.receiver),
-        },
-    );
-    let x = row(&mut p, f.owner, "X");
-    let (_, branch) = operand(&mut p, f.owner, FragmentOperator::Alternative);
-    delete_line(&mut p, branch, f.sender, f.receiver);
-    row(&mut p, f.owner, "Y");
-    oa_core::session::validate_candidate(&p).unwrap();
-    let prepared = prepare(&p, f.owner, &[x, use_line]).unwrap();
-    assert!(
-        prepared
-            .plan(slot(f.owner, None))
-            .unwrap_err()
-            .contains("lifeline_lifetime")
-    );
-}
-
-#[test]
-fn exclusive_operand_move_is_legal_but_parallel_baseline_is_invalid() {
-    for operator in [FragmentOperator::Alternative, FragmentOperator::Parallel] {
-        let f = super::super::direct_tests::fixture();
-        let mut p = f.project;
-        let (fragment, left) = operand(&mut p, f.owner, operator);
-        let right = second_operand(&mut p, fragment);
-        delete_line(&mut p, left, f.sender, f.receiver);
-        let use_line = add(
-            &mut p,
-            right,
-            "Use participant",
-            OccurrenceBody::Action {
-                action: None,
-                lifeline: Some(f.receiver),
-            },
-        );
-        let x = row(&mut p, right, "X");
-        let y = row(&mut p, right, "Y");
-        if operator == FragmentOperator::Alternative {
-            oa_core::session::validate_candidate(&p).unwrap();
-            exact_transaction(
-                &p,
-                prepare(&p, f.owner, &[x, use_line])
-                    .unwrap()
-                    .plan(slot(right, None))
-                    .unwrap(),
-                ordered(&p, right, &[y, use_line, x]),
-            );
-        } else {
-            // This is an invalid input control, not a valid model broken by reorder.
-            assert!(
-                oa_core::session::validate_candidate(&p)
-                    .unwrap_err()
-                    .to_string()
-                    .contains("lifeline_lifetime")
-            );
-            assert!(prepare(&p, f.owner, &[x, use_line]).is_err());
-        }
-    }
-}
-
-#[test]
-fn repeated_reply_warning_does_not_block_independent_sibling_reorder() {
-    let f = super::super::direct_tests::fixture();
-    let mut p = f.project;
-    let (_, branch) = operand(&mut p, f.owner, FragmentOperator::Loop);
-    p.elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .retain(|id| *id != f.reply);
-    p.elements.get_mut(&f.reply).unwrap().parent = Some(branch);
-    p.elements
-        .get_mut(&branch)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(f.reply);
-    let x = row(&mut p, branch, "X");
-    let y = row(&mut p, branch, "Y");
-    let z = row(&mut p, branch, "Z");
-    let warning = |project: &Project| {
-        oa_core::validation::validate(project).iter().any(|issue| {
-            issue.element == Some(f.reply)
-                && issue.code == "reply_repetition"
-                && issue.severity == oa_core::validation::Severity::Warning
-        })
-    };
-    assert!(warning(&p));
-    let expected = ordered(&p, branch, &[f.reply, y, x, z]);
-    assert!(warning(&expected));
-    exact_transaction(
-        &p,
-        prepare(&p, f.owner, &[z, x])
-            .unwrap()
-            .plan(slot(branch, None))
-            .unwrap(),
-        expected,
-    );
-}
-
-#[test]
-fn semantic_reorder_preserves_affected_and_unrelated_authored_layouts() {
-    use oa_core::{
-        Diagram, DiagramLayout, OccurrenceEndpoint, ProjectionKind, ScenarioLanePosition,
-        ScenarioLayout, ScenarioMessagePosition,
-    };
-    let f = super::super::direct_tests::fixture();
-    let mut p = f.project;
-    let x = row(&mut p, f.owner, "X");
-    let y = row(&mut p, f.owner, "Y");
-    p = ordered(&p, f.owner, &[f.call, x, f.reply, y]);
-    for (alias, offset) in [("group_saved_a", 0.), ("group_saved_b", 1500.)] {
-        let id = Id::new_v4();
-        p.diagrams.insert(
-            id,
-            Diagram {
-                id,
-                alias: alias.into(),
-                name: alias.into(),
-                description: "Preserve my layout".into(),
-                layer: Layer::Oa,
-                projection: ProjectionKind::Scenario { scenario: f.owner },
-                view_options: Default::default(),
-                nodes: Default::default(),
-                routes: vec![],
-                layout: Some(DiagramLayout::Scenario(ScenarioLayout {
-                    lanes: vec![
-                        ScenarioLanePosition {
-                            lifeline: f.sender,
-                            x: -300. + offset,
-                        },
-                        ScenarioLanePosition {
-                            lifeline: f.receiver,
-                            x: 700. + offset,
-                        },
-                    ],
-                    messages: vec![
-                        ScenarioMessagePosition {
-                            address: OccurrenceEndpoint {
-                                references: vec![],
-                                occurrence: f.call,
-                            },
-                            send_y: 123. + offset,
-                        },
-                        ScenarioMessagePosition {
-                            address: OccurrenceEndpoint {
-                                references: vec![],
-                                occurrence: f.reply,
-                            },
-                            send_y: 567. + offset,
-                        },
-                    ],
-                })),
-            },
-        );
-    }
-    let unrelated = p
-        .add_element(Kind::Scenario, Layer::Oa, "Unrelated scenario", None)
-        .unwrap();
-    let line = p
-        .add_element(
-            Kind::Lifeline,
-            Layer::Oa,
-            "Unrelated clock",
-            Some(unrelated),
-        )
-        .unwrap();
-    let timer = add(
-        &mut p,
-        unrelated,
-        "Wait",
-        OccurrenceBody::Exchange {
-            exchange: None,
-            sender: Some(line),
-            receiver: None,
-            message_kind: MessageKind::Timer {
-                expression: "5 s".into(),
-            },
-            reply_to: None,
-            values: vec![],
-            operation: None,
-        },
-    );
-    let diagram = Id::new_v4();
-    p.diagrams.insert(
-        diagram,
-        Diagram {
-            id: diagram,
-            alias: "group_unrelated_saved".into(),
-            name: "Unrelated arrangement".into(),
-            description: "Do not touch this view".into(),
-            layer: Layer::Oa,
-            projection: ProjectionKind::Scenario {
-                scenario: unrelated,
-            },
-            view_options: Default::default(),
-            nodes: Default::default(),
-            routes: vec![],
-            layout: Some(DiagramLayout::Scenario(ScenarioLayout {
-                lanes: vec![ScenarioLanePosition {
-                    lifeline: line,
-                    x: -123.,
-                }],
-                messages: vec![ScenarioMessagePosition {
-                    address: OccurrenceEndpoint {
-                        references: vec![],
-                        occurrence: timer,
-                    },
-                    send_y: 987.,
-                }],
-            })),
-        },
-    );
-    oa_core::session::validate_candidate(&p).unwrap();
-    exact_transaction(
-        &p,
-        prepare(&p, f.owner, &[f.reply, f.call])
-            .unwrap()
-            .plan(slot(f.owner, None))
-            .unwrap(),
-        ordered(&p, f.owner, &[x, y, f.call, f.reply]),
-    );
-}

crates/oa-desktop/src/behavior/scenario/presentation_tests.rs

@@ -218,7 +218,6 @@ fn complete_fallback_scene_selects_but_cannot_capture_or_finish_coordinate_gestu
     let stamp = spacing::Stamp {
         context,
         camera_epoch: 17,
-        selection_generation: 0,
     };
     ready_scene.coordinate_input = true;
     ready_scene.interaction = Some((context, CanvasTool::Select, true));

crates/oa-desktop/src/behavior/scenario/reorder_session.rs

@@ -1,241 +0,0 @@
-//! Immutable semantic reorder operation, independent of its destination UI.
-use super::{
-    Context, Slot,
-    group_reorder::{Plan, Prepared},
-    presentation, selection,
-};
-use crate::{diagram_selection::Snapshot, diagram_usage::Target};
-use oa_core::{Command, Id, Project, execute_batch};
-use std::sync::Arc;
-
-#[derive(Debug, PartialEq, Eq)]
-pub(crate) enum Outcome {
-    Change,
-    Noop,
-    Refused(String),
-}
-
-pub(crate) struct Preview {
-    pub(crate) slot: Slot,
-    pub(crate) before: Vec<Id>,
-    pub(crate) after: Vec<Id>,
-    pub(crate) outcome: Outcome,
-    /// Geometry status is independent of semantic validity; requested Saved
-    /// representation is retained even when presentation reports fallback.
-    pub(crate) presentation: Option<presentation::ScenarioPresentation>,
-    pub(crate) selection_visible: bool,
-    command: Option<Box<Command>>,
-}
-
-pub(crate) struct Completion {
-    pub(crate) command: Option<Box<Command>>,
-    pub(crate) snapshot: Snapshot,
-    pub(crate) representation: super::Representation,
-    pub(crate) presentation_status: presentation::PresentationStatus,
-}
-
-pub(crate) struct Session {
-    project: Arc<Project>,
-    context: Context,
-    snapshot: Snapshot,
-    token: Id,
-    primary: Id,
-    parent: Id,
-    before: Vec<Id>,
-    prepared: Prepared,
-    preview: Option<Preview>,
-    #[cfg(test)]
-    proposal_builds: usize,
-}
-
-impl Session {
-    pub(crate) fn new(
-        project: Arc<Project>,
-        context: Context,
-        snapshot: Snapshot,
-        token: Id,
-    ) -> Result<Self, String> {
-        if token.is_nil()
-            || context.document.is_nil()
-            || context.visit.is_nil()
-            || snapshot.context() != selection::context(context)
-            || presentation::checked_owner(&project, context.representation)
-                != Some(context.scenario)
-        {
-            return Err("The reorder input no longer matches this scenario view.".into());
-        }
-        let Some(Target::ScenarioObject(primary)) = snapshot.primary() else {
-            return Err("Select ordered scenario occurrences.".into());
-        };
-        let primary = *primary;
-        let visible = selection::visible(&project, context, primary);
-        if !snapshot
-            .targets()
-            .contains(&Target::ScenarioObject(primary))
-            || snapshot
-                .targets()
-                .iter()
-                .any(|target| !visible.contains(target))
-        {
-            return Err("Every selected occurrence must be visible in this scenario view.".into());
-        }
-        let prepared = Prepared::new(project.clone(), context.scenario, snapshot.targets())?;
-        let parent = project.elements[&primary]
-            .parent
-            .expect("prepared occurrence parent");
-        let before = project.elements[&parent]
-            .steps()
-            .expect("prepared sequence")
-            .clone();
-        Ok(Self {
-            project,
-            context,
-            snapshot,
-            token,
-            primary,
-            parent,
-            before,
-            prepared,
-            preview: None,
-            #[cfg(test)]
-            proposal_builds: 0,
-        })
-    }
-
-    pub(crate) fn context(&self) -> Context {
-        self.context
-    }
-    pub(crate) fn token(&self) -> Id {
-        self.token
-    }
-    pub(crate) fn snapshot(&self) -> &Snapshot {
-        &self.snapshot
-    }
-    pub(crate) fn parent(&self) -> Id {
-        self.parent
-    }
-    pub(crate) fn before(&self) -> &[Id] {
-        &self.before
-    }
-
-    pub(crate) fn current_preview(&self) -> Option<&Preview> {
-        self.preview.as_ref()
-    }
-
-    #[cfg(test)]
-    pub(crate) fn current_preview_mut(&mut self) -> Option<&mut Preview> {
-        self.preview.as_mut()
-    }
-
-    pub(crate) fn matches(
-        &self,
-        current: &Project,
-        context: Context,
-        snapshot: &Snapshot,
-        token: Id,
-    ) -> bool {
-        current == self.project.as_ref()
-            && context == self.context
-            && snapshot == &self.snapshot
-            && token == self.token
-    }
-
-    pub(crate) fn preview(&mut self, slot: Slot) -> &Preview {
-        if self
-            .preview
-            .as_ref()
-            .is_none_or(|preview| preview.slot != slot)
-        {
-            #[cfg(test)]
-            {
-                self.proposal_builds += 1;
-            }
-            let result = self.prepared.plan(slot).and_then(|plan| match plan {
-                Plan::Noop => Ok((None, self.project.clone())),
-                Plan::Change(command) => {
-                    let candidate =
-                        execute_batch(&self.project, std::slice::from_ref(command.as_ref()))
-                            .map_err(|error| error.to_string())?;
-                    Ok((Some(command), Arc::new(candidate)))
-                }
-            });
-            let preview = match result {
-                Ok((command, candidate)) => {
-                    let shown = presentation::present(
-                        &candidate,
-                        self.context.representation,
-                        self.primary,
-                    );
-                    let visible = shown
-                        .scene()
-                        .map_or_else(Vec::new, |scene| scene.selection_targets());
-                    let selection_visible = self
-                        .snapshot
-                        .targets()
-                        .iter()
-                        .all(|target| visible.contains(target));
-                    Preview {
-                        slot,
-                        before: self.before.clone(),
-                        after: candidate.elements[&self.parent]
-                            .steps()
-                            .expect("validated sequence")
-                            .clone(),
-                        outcome: if command.is_some() {
-                            Outcome::Change
-                        } else {
-                            Outcome::Noop
-                        },
-                        presentation: Some(shown),
-                        selection_visible,
-                        command,
-                    }
-                }
-                Err(reason) => Preview {
-                    slot,
-                    before: self.before.clone(),
-                    after: self.before.clone(),
-                    outcome: Outcome::Refused(reason),
-                    presentation: None,
-                    selection_visible: false,
-                    command: None,
-                },
-            };
-            self.preview = Some(preview);
-        }
-        self.preview.as_ref().expect("explicit destination preview")
-    }
-
-    /// Consume once; never execute a Document transaction or alter selection.
-    pub(crate) fn finish(
-        self,
-        current: &Project,
-        context: Context,
-        snapshot: &Snapshot,
-        token: Id,
-    ) -> Result<Completion, String> {
-        if !self.matches(current, context, snapshot, token) {
-            return Err("The reorder input changed; choose the operation again.".into());
-        }
-        let preview = self
-            .preview
-            .ok_or("Choose an explicit destination before applying reorder.")?;
-        if let Outcome::Refused(reason) = preview.outcome {
-            return Err(reason);
-        }
-        let presentation_status = preview
-            .presentation
-            .expect("valid plan presentation")
-            .status()
-            .clone();
-        Ok(Completion {
-            command: preview.command,
-            snapshot: self.snapshot,
-            representation: self.context.representation,
-            presentation_status,
-        })
-    }
-}
-
-#[cfg(test)]
-mod tests;

crates/oa-desktop/src/behavior/scenario/reorder_session/tests.rs

@@ -1,354 +0,0 @@
-use super::*;
-use crate::{
-    behavior::{
-        scenario::{Representation, direct_tests},
-        topology::occurrence,
-    },
-    diagram_selection::Selection,
-};
-use oa_core::{Diagram, DiagramLayout, Layer, OccurrenceBody, ProjectionKind, ScenarioLayout};
-
-fn row(project: &mut Project, parent: Id, name: &str) -> Id {
-    let element = occurrence(
-        project,
-        parent,
-        name,
-        OccurrenceBody::Action {
-            action: None,
-            lifeline: None,
-        },
-    );
-    let id = element.id;
-    project.elements.insert(id, element);
-    project
-        .elements
-        .get_mut(&parent)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(id);
-    id
-}
-fn snapshot(context: Context, ids: &[Id]) -> Snapshot {
-    let mut selection = Selection::new(selection::context(context).scope);
-    for id in ids {
-        selection.add(Target::ScenarioObject(*id), |_| true);
-    }
-    selection.snapshot(selection::context(context)).unwrap()
-}
-fn session(project: &Project, context: Context, ids: &[Id]) -> Session {
-    Session::new(
-        Arc::new(project.clone()),
-        context,
-        snapshot(context, ids),
-        Id::new_v4(),
-    )
-    .unwrap()
-}
-
-#[test]
-fn explicit_destination_cache_and_exact_whole_model_saved_presentation() {
-    for mode in 0..3 {
-        let f = direct_tests::fixture();
-        let mut project = f.project;
-        let x = row(&mut project, f.owner, "X");
-        let y = row(&mut project, f.owner, "Y");
-        let mut context = direct_tests::context(f.owner);
-        for name in ["A", "B"] {
-            let id = Id::new_v4();
-            project.diagrams.insert(
-                id,
-                Diagram {
-                    id,
-                    alias: name.into(),
-                    name: name.into(),
-                    description: "Keep this view".into(),
-                    layer: Layer::Oa,
-                    projection: ProjectionKind::Scenario { scenario: f.owner },
-                    nodes: Default::default(),
-                    routes: vec![],
-                    view_options: Default::default(),
-                    layout: Some(DiagramLayout::Scenario(ScenarioLayout {
-                        lanes: vec![oa_core::ScenarioLanePosition {
-                            lifeline: f.sender,
-                            x: if name == "A" { 180. } else { 220. },
-                        }],
-                        messages: [(f.call, 600.), (f.reply, 800.)]
-                            .into_iter()
-                            .map(|(occurrence, send_y)| oa_core::ScenarioMessagePosition {
-                                address: oa_core::OccurrenceEndpoint {
-                                    references: vec![],
-                                    occurrence,
-                                },
-                                send_y,
-                            })
-                            .collect(),
-                    })),
-                },
-            );
-            if mode != 0 && name == "A" {
-                context.representation = Representation::Saved { diagram: id };
-                if mode == 2 {
-                    project.diagrams.get_mut(&id).unwrap().layout =
-                        Some(DiagramLayout::Scenario(ScenarioLayout {
-                            lanes: vec![],
-                            messages: [(f.call, 600.), (f.reply, 200.)]
-                                .into_iter()
-                                .map(|(occurrence, send_y)| oa_core::ScenarioMessagePosition {
-                                    address: oa_core::OccurrenceEndpoint {
-                                        references: vec![],
-                                        occurrence,
-                                    },
-                                    send_y,
-                                })
-                                .collect(),
-                        }));
-                }
-            }
-        }
-        let mut operation = session(&project, context, &[f.reply, f.call]);
-        assert_eq!(operation.parent(), f.owner);
-        assert_eq!(operation.before(), &[f.call, f.reply, x, y]);
-        assert_eq!(operation.context(), context);
-        let original_snapshot = operation.snapshot().clone();
-        let token = operation.token();
-        let slot = Slot {
-            parent: f.owner,
-            before: None,
-        };
-        let preview = operation.preview(slot);
-        assert_eq!(preview.before, [f.call, f.reply, x, y]);
-        assert_eq!(preview.after, [x, y, f.call, f.reply]);
-        assert_eq!(preview.outcome, Outcome::Change);
-        assert_eq!(
-            preview.presentation.as_ref().unwrap().requested(),
-            context.representation
-        );
-        assert_eq!(operation.proposal_builds, 1);
-        operation.preview(slot);
-        assert_eq!(operation.proposal_builds, 1);
-        operation.preview(Slot {
-            parent: f.owner,
-            before: Some(f.call),
-        });
-        assert_eq!(operation.proposal_builds, 2);
-        operation.preview(slot);
-        assert_eq!(operation.proposal_builds, 3);
-        assert_eq!(operation.preview.as_ref().unwrap().slot, slot);
-        let completion = operation
-            .finish(&project, context, &original_snapshot, token)
-            .unwrap();
-        assert_eq!(completion.snapshot, original_snapshot);
-        assert_eq!(completion.representation, context.representation);
-        if mode == 2 {
-            assert!(matches!(
-                completion.presentation_status,
-                presentation::PresentationStatus::Fallback { .. }
-            ));
-        } else {
-            assert!(matches!(
-                completion.presentation_status,
-                presentation::PresentationStatus::Ready
-            ));
-        }
-        let mut expected = project.clone();
-        *expected
-            .elements
-            .get_mut(&f.owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap() = vec![x, y, f.call, f.reply];
-        assert_eq!(
-            execute_batch(&project, &[*completion.command.unwrap()]).unwrap(),
-            expected
-        );
-        assert_eq!(expected.diagrams, project.diagrams);
-    }
-}
-
-#[test]
-fn no_destination_is_not_noop_and_selected_anchor_is_explicit_noop() {
-    let f = direct_tests::fixture();
-    let context = direct_tests::context(f.owner);
-    let mut operation = session(&f.project, context, &[f.call, f.reply]);
-    let captured = operation.snapshot().clone();
-    let token = operation.token();
-    assert!(
-        operation
-            .finish(&f.project, context, &captured, token)
-            .is_err()
-    );
-    operation = session(&f.project, context, &[f.call, f.reply]);
-    let token = operation.token();
-    assert_eq!(
-        operation
-            .preview(Slot {
-                parent: f.owner,
-                before: Some(f.reply)
-            })
-            .outcome,
-        Outcome::Noop
-    );
-    assert!(
-        operation
-            .finish(&f.project, context, &captured, token)
-            .unwrap()
-            .command
-            .is_none()
-    );
-}
-
-#[test]
-fn temporal_candidate_refuses_without_changing_baseline_or_selection() {
-    let f = direct_tests::fixture();
-    let context = direct_tests::context(f.owner);
-    let mut project = f.project;
-    let later = row(&mut project, f.owner, "Later action");
-    let mut operation = session(&project, context, &[f.reply]);
-    let captured = operation.snapshot().clone();
-    let token = operation.token();
-    // A previously valid proposal must not survive a new refused destination.
-    let valid = operation.preview(Slot {
-        parent: f.owner,
-        before: None,
-    });
-    assert_eq!(valid.outcome, Outcome::Change);
-    assert_eq!(valid.after, [f.call, later, f.reply]);
-    let preview = operation.preview(Slot {
-        parent: f.owner,
-        before: Some(f.call),
-    });
-    assert!(matches!(&preview.outcome, Outcome::Refused(reason) if reason.contains("reply_order")));
-    assert!(preview.presentation.is_none());
-    assert_eq!(preview.before, preview.after);
-    assert!(
-        operation
-            .finish(&project, context, &captured, token)
-            .is_err()
-    );
-}
-
-#[test]
-fn mixed_cross_parent_and_unrendered_sets_never_reduce_to_primary() {
-    let f = direct_tests::fixture();
-    let context = direct_tests::context(f.owner);
-    let mut project = f.project;
-    let other = project
-        .add_element(oa_core::Kind::Scenario, Layer::Oa, "Other", None)
-        .unwrap();
-    let foreign = row(&mut project, other, "Foreign");
-    let fragment = occurrence(
-        &project,
-        f.owner,
-        "Fragment",
-        OccurrenceBody::Fragment {
-            operator: oa_core::FragmentOperator::Alternative,
-            branches: vec![],
-        },
-    );
-    let fragment_id = fragment.id;
-    project.elements.insert(fragment_id, fragment);
-    project
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(fragment_id);
-    let branch = occurrence(
-        &project,
-        fragment_id,
-        "Branch",
-        OccurrenceBody::Branch {
-            guard: "ready".into(),
-            occurrences: vec![],
-        },
-    );
-    let branch_id = branch.id;
-    project.elements.insert(branch_id, branch);
-    if let Some(oa_core::SharedBody::Occurrence {
-        body: OccurrenceBody::Fragment { branches, .. },
-        ..
-    }) = project.elements.get_mut(&fragment_id).unwrap().shared_mut()
-    {
-        branches.push(branch_id);
-    }
-    let nested = row(&mut project, branch_id, "Nested");
-    assert!(
-        selection::visible(&project, context, f.call).contains(&Target::ScenarioObject(nested))
-    );
-    for ids in [
-        vec![f.sender, f.call],
-        vec![nested, f.call],
-        vec![foreign, f.call],
-        vec![Id::new_v4(), f.call],
-    ] {
-        assert!(
-            Session::new(
-                Arc::new(project.clone()),
-                context,
-                snapshot(context, &ids),
-                Id::new_v4()
-            )
-            .is_err()
-        );
-    }
-}
-
-#[test]
-fn stale_finish_checks_every_immutable_input_and_constructor_rejects_nil_lifetimes() {
-    let f = direct_tests::fixture();
-    let context = direct_tests::context(f.owner);
-    for altered in 0..8 {
-        let mut operation = session(&f.project, context, &[f.call, f.reply]);
-        let mut token = operation.token();
-        let mut captured = operation.snapshot().clone();
-        let mut current = f.project.clone();
-        let mut live = context;
-        operation.preview(Slot {
-            parent: f.owner,
-            before: None,
-        });
-        match altered {
-            0 => {
-                current.elements.get_mut(&f.call).unwrap().name.push('!');
-            }
-            1 => live.epoch += 1,
-            2 => captured = snapshot(context, &[f.reply, f.call]),
-            3 => token = Id::new_v4(),
-            4 => live.visit = Id::new_v4(),
-            5 => live.document = Id::new_v4(),
-            6 => live.revision += 1,
-            _ => {
-                let mut selection = Selection::new(selection::context(context).scope);
-                selection.add(Target::ScenarioObject(f.call), |_| true);
-                selection.add(Target::ScenarioObject(f.reply), |_| true);
-                selection.set_primary(&Target::ScenarioObject(f.call));
-                selection.set_primary(&Target::ScenarioObject(f.reply));
-                captured = selection.snapshot(selection::context(context)).unwrap();
-                assert_eq!(captured.targets(), operation.snapshot().targets());
-                assert_eq!(captured.primary(), operation.snapshot().primary());
-                assert_ne!(captured.generation(), operation.snapshot().generation());
-            }
-        }
-        assert!(operation.finish(&current, live, &captured, token).is_err());
-    }
-    for altered in 0..3 {
-        let mut live = context;
-        let mut token = Id::new_v4();
-        match altered {
-            0 => live.document = Id::nil(),
-            1 => live.visit = Id::nil(),
-            _ => token = Id::nil(),
-        }
-        assert!(
-            Session::new(
-                Arc::new(f.project.clone()),
-                live,
-                snapshot(live, &[f.call]),
-                token
-            )
-            .is_err()
-        );
-    }
-}

crates/oa-desktop/src/behavior/scenario/reorder_slot_experiments.rs

@@ -1,234 +0,0 @@
-//! Candidate-input experiment, not an accepted new interaction policy.
-//! Exercise production presentation, nearest-Y picking, and exact semantic slots.
-use super::{Representation, Slot, group_reorder, presentation};
-use crate::{behavior::Scene, diagram_usage::Target};
-use iced::Point;
-use oa_core::{
-    Diagram, DiagramLayout, Id, OccurrenceEndpoint, Project, ProjectionKind, ScenarioLayout,
-    ScenarioMessagePosition, execute_batch, language, validation,
-};
-use std::sync::Arc;
-
-struct Fixture {
-    project: Project,
-    owner: Id,
-    diagram: Id,
-    ids: [Id; 4],
-}
-
-fn fixture(ys: [f32; 4]) -> Fixture {
-    let mut project = language::parse(SOURCE).unwrap();
-    let named = |name: &str| {
-        project
-            .identities()
-            .into_iter()
-            .find(|(_, alias)| *alias == name)
-            .unwrap()
-            .0
-    };
-    let owner = named("conversation");
-    let ids = [named("a"), named("b"), named("c"), named("d")];
-    let diagram = Id::new_v4();
-    project.diagrams.insert(
-        diagram,
-        Diagram {
-            id: diagram,
-            alias: "saved".into(),
-            name: "Authored coordinates".into(),
-            description: String::new(),
-            layer: project.elements[&owner].layer(),
-            projection: ProjectionKind::Scenario { scenario: owner },
-            view_options: Default::default(),
-            nodes: Default::default(),
-            routes: vec![],
-            layout: Some(DiagramLayout::Scenario(ScenarioLayout {
-                lanes: vec![],
-                messages: ids
-                    .into_iter()
-                    .zip(ys)
-                    .map(|(occurrence, send_y)| ScenarioMessagePosition {
-                        address: OccurrenceEndpoint {
-                            occurrence,
-                            references: vec![],
-                        },
-                        send_y,
-                    })
-                    .collect(),
-            })),
-        },
-    );
-    assert!(
-        validation::validate(&project)
-            .iter()
-            .all(|issue| issue.severity != validation::Severity::Error)
-    );
-    Fixture {
-        project,
-        owner,
-        diagram,
-        ids,
-    }
-}
-
-fn shown(f: &Fixture) -> presentation::ScenarioPresentation {
-    let shown = presentation::present(
-        &f.project,
-        Representation::Saved { diagram: f.diagram },
-        f.ids[0],
-    );
-    assert_eq!(shown.status(), &presentation::PresentationStatus::Ready);
-    assert_eq!(shown.requested(), shown.geometry_representation().unwrap());
-    shown
-}
-
-fn before(f: &Fixture, id: Id) -> Slot {
-    Slot {
-        parent: f.owner,
-        before: Some(id),
-    }
-}
-
-fn y(scene: &Scene, slot: Slot) -> f32 {
-    scene.slots.iter().find(|item| item.slot == slot).unwrap().y
-}
-
-fn picked(scene: &Scene, f: &Fixture, world_y: f32) -> Slot {
-    scene
-        .slot_at(Point::new(100., world_y), Some(f.owner))
-        .unwrap()
-        .slot
-}
-
-fn exact_change(f: &Fixture, selected: &[Id], slot: Slot, order: &[Id]) {
-    let prepared = group_reorder::Prepared::new(
-        Arc::new(f.project.clone()),
-        f.owner,
-        &selected
-            .iter()
-            .copied()
-            .map(Target::ScenarioObject)
-            .collect::<Vec<_>>(),
-    )
-    .unwrap();
-    let group_reorder::Plan::Change(command) = prepared.plan(slot).unwrap() else {
-        panic!("expected an actual semantic change")
-    };
-    let actual = execute_batch(&f.project, std::slice::from_ref(command.as_ref())).unwrap();
-    let mut expected = f.project.clone();
-    *expected
-        .elements
-        .get_mut(&f.owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap() = order.to_vec();
-    // Literal full-model oracle: every authored position and other field survives.
-    assert_eq!(actual, expected);
-    assert_eq!(
-        language::parse(&language::format(&actual)).unwrap(),
-        expected
-    );
-    assert_eq!(
-        presentation::present(
-            &actual,
-            Representation::Saved { diagram: f.diagram },
-            selected[0]
-        )
-        .status(),
-        &presentation::PresentationStatus::Ready
-    );
-}
-
-#[test]
-fn crossed_saved_slots_are_reachable_but_screen_order_is_not_semantic_order() {
-    let f = fixture([200., 500., 300., 400.]);
-    let [a, b, c, d] = f.ids;
-    let shown = shown(&f);
-    let scene = shown.scene().unwrap();
-    assert_eq!(
-        f.ids.map(|id| y(scene, before(&f, id))),
-        [158., 458., 258., 358.]
-    );
-    let mut spatial = f.ids.to_vec();
-    spatial.sort_by(|a, b| y(scene, before(&f, *a)).total_cmp(&y(scene, before(&f, *b))));
-    assert_eq!(spatial, [a, c, d, b]);
-    for id in f.ids {
-        assert_eq!(picked(scene, &f, y(scene, before(&f, id))), before(&f, id));
-    }
-    exact_change(&f, &[c, a], before(&f, d), &[b, a, c, d]);
-}
-
-#[test]
-fn equal_saved_slots_hide_one_destination_while_exact_chooser_can_select_it() {
-    let f = fixture([200., 300., 300., 500.]);
-    let [a, b, c, d] = f.ids;
-    let shown = shown(&f);
-    let scene = shown.scene().unwrap();
-    assert_eq!(y(scene, before(&f, b)), 258.);
-    assert_eq!(y(scene, before(&f, c)), 258.);
-    assert!(
-        scene
-            .slots
-            .iter()
-            .position(|item| item.slot == before(&f, b))
-            < scene
-                .slots
-                .iter()
-                .position(|item| item.slot == before(&f, c))
-    );
-    // The two distances are identical for every finite Y; min_by keeps the first
-    // tie. The sample exercises that production behavior, not an exhaustive proof.
-    for quarter_pixel in -4000..=12000 {
-        assert_ne!(picked(scene, &f, quarter_pixel as f32 / 4.), before(&f, c));
-    }
-    assert_eq!(picked(scene, &f, 258.), before(&f, b));
-    exact_change(&f, &[d, a], before(&f, c), &[b, a, d, c]);
-    exact_change(&f, &[d, a], picked(scene, &f, 258.), &[a, d, b, c]);
-}
-
-#[test]
-fn close_saved_slots_have_subpixel_hit_regions_without_becoming_unreachable_continuously() {
-    let f = fixture([200., 300., 300.125, 300.25]);
-    let [_, b, c, d] = f.ids;
-    let shown = shown(&f);
-    let scene = shown.scene().unwrap();
-    assert_eq!(y(scene, before(&f, b)), 258.);
-    assert_eq!(y(scene, before(&f, c)), 258.125);
-    assert_eq!(y(scene, before(&f, d)), 258.25);
-    assert_eq!(picked(scene, &f, 258.125), before(&f, c));
-    // Fixed scale=1/pan=0: C's open Voronoi interval is only
-    // (258.0625, 258.1875). Integer-pixel samples miss it. This does not assert
-    // that all platforms quantize pointer input to integer coordinates.
-    for screen_y in 0..=600 {
-        assert_ne!(picked(scene, &f, screen_y as f32), before(&f, c));
-    }
-}
-
-#[test]
-fn offscreen_saved_slot_needs_camera_change_or_nonspatial_destination_input() {
-    let f = fixture([200., 300., 400., 2000.]);
-    let [a, b, c, d] = f.ids;
-    let shown = shown(&f);
-    let scene = shown.scene().unwrap();
-    assert_eq!(y(scene, before(&f, d)), 1958.);
-    // Fixed scale=1/pan=0 and a 600px-high canvas. The C/D midpoint is
-    // 1158, beyond the whole viewport, so D cannot win within that viewport.
-    for quarter_pixel in 0..=2400 {
-        assert_ne!(picked(scene, &f, quarter_pixel as f32 / 4.), before(&f, d));
-    }
-    assert_eq!(picked(scene, &f, 1958.), before(&f, d));
-    exact_change(&f, &[c, a], before(&f, d), &[b, a, c, d]);
-}
-
-const SOURCE: &str = r#"arcadia 7;
-project slot_probe "Slot probe" id "71000000-0000-4000-8000-000000000001" {
- oa_activity source "Source" id "71000000-0000-4000-8000-000000000002" {}
- oa_activity target "Target" id "71000000-0000-4000-8000-000000000003" {}
- oa_scenario conversation "Conversation" id "71000000-0000-4000-8000-000000000004" { viewpoint OperationalActivity; steps [@a, @b, @c, @d]; }
- oa_lifeline left "Left" id "71000000-0000-4000-8000-000000000005" { parent @conversation; represented @source; }
- oa_lifeline right "Right" id "71000000-0000-4000-8000-000000000006" { parent @conversation; represented @target; }
- oa_occurrence a "A" id "71000000-0000-4000-8000-000000000007" { parent @conversation; body { Exchange { exchange none; sender @left; receiver @right; message_kind Asynchronous; }; }; }
- oa_occurrence b "B" id "71000000-0000-4000-8000-000000000008" { parent @conversation; body { Exchange { exchange none; sender @left; receiver @right; message_kind Asynchronous; }; }; }
- oa_occurrence c "C" id "71000000-0000-4000-8000-000000000009" { parent @conversation; body { Exchange { exchange none; sender @left; receiver @right; message_kind Asynchronous; }; }; }
- oa_occurrence d "D" id "71000000-0000-4000-8000-00000000000a" { parent @conversation; body { Exchange { exchange none; sender @left; receiver @right; message_kind Asynchronous; }; }; }
-}
-"#;

crates/oa-desktop/src/behavior/scenario/reorder_view.rs

@@ -1,323 +0,0 @@
-//! Identity-based destination choice, independent of saved screen coordinates.
-use super::*;
-use crate::app::scenario_reorder::{Event, Intent};
-use crate::behavior::scenario_layout::presentation::PresentationStatus;
-use iced::widget::{column, opaque, scrollable};
-
-const PAGE_SIZE: usize = 5;
-
-pub(crate) fn query_id(token: Id) -> iced::widget::Id {
-    iced::widget::Id::from(format!("scenario-reorder-query:{token}"))
-}
-
-pub(crate) fn focus_query(token: Id) -> iced::Task<Message> {
-    use iced::advanced::widget::{Operation, operation};
-    struct Find {
-        target: iced::widget::Id,
-        present: bool,
-    }
-    impl Operation for Find {
-        fn traverse(&mut self, visit: &mut dyn FnMut(&mut dyn Operation)) {
-            visit(self);
-        }
-        fn focusable(
-            &mut self,
-            id: Option<&iced::widget::Id>,
-            _: iced::Rectangle,
-            _: &mut dyn operation::Focusable,
-        ) {
-            self.present |= id == Some(&self.target);
-        }
-        fn finish(&self) -> operation::Outcome<()> {
-            if self.present {
-                operation::Outcome::Chain(Box::new(operation::focusable::focus(
-                    self.target.clone(),
-                )))
-            } else {
-                operation::Outcome::None
-            }
-        }
-    }
-    // Generic focus would blur every current widget if the old token vanished.
-    // Discover the exact target without changing focus before chaining it.
-    iced::advanced::widget::operate(Find {
-        target: query_id(token),
-        present: false,
-    })
-    .discard()
-}
-
-pub(crate) fn apply_message(app: &App) -> Option<Message> {
-    if !app.scenario_reorder_enabled() {
-        return None;
-    }
-    let session = app.scenario_reorder.session.as_ref()?;
-    let preview = session.current_preview()?;
-    (preview.selection_visible
-        && !matches!(preview.outcome, reorder_session::Outcome::Refused(_))
-        && matches!(
-            preview.presentation.as_ref()?.status(),
-            PresentationStatus::Ready | PresentationStatus::Fallback { .. }
-        ))
-    .then(|| message(session, Intent::Finish(preview.slot)))
-}
-
-pub(crate) fn message(session: &reorder_session::Session, intent: Intent) -> Message {
-    Message::ScenarioReorder(Box::new(Event {
-        context: session.context(),
-        snapshot: session.snapshot().clone(),
-        token: session.token(),
-        intent,
-    }))
-}
-
-pub(crate) fn begin(app: &App) -> Option<Message> {
-    (app.scenario_reorder_enabled() && app.scenario_reorder.session.is_none()).then_some(())?;
-    let snapshot = app.multiselect_snapshot()?;
-    if snapshot.targets().is_empty() {
-        return None;
-    }
-    Some(Message::ScenarioReorder(Box::new(Event {
-        context: app.scenario_context()?,
-        snapshot,
-        token: Id::new_v4(),
-        intent: Intent::Begin,
-    })))
-}
-
-fn label(p: &Project, id: Id) -> String {
-    p.elements.get(&id).map_or_else(
-        || id.to_string(),
-        |e| format!("{} (@{})", short(&e.name, 38), e.alias),
-    )
-}
-
-fn destination(p: &Project, before: &[Id], slot: Slot) -> String {
-    slot.before.map_or_else(
-        || "End of sequence".into(),
-        |id| {
-            let position = before
-                .iter()
-                .position(|item| *item == id)
-                .map_or(0, |i| i + 1);
-            format!("Before {position}. {}", label(p, id))
-        },
-    )
-}
-
-fn order(p: &Project, ids: &[Id], snapshot: &crate::diagram_selection::Snapshot) -> String {
-    // A bounded neighborhood keeps the moved block and its immediate neighbors
-    // visible. Ellipses explicitly mark omitted, unchanged sequence members.
-    let selected = |id: &Id| {
-        snapshot
-            .targets()
-            .contains(&crate::diagram_usage::Target::ScenarioObject(*id))
-    };
-    let mut parts = Vec::new();
-    let mut omitted = false;
-    for (index, id) in ids.iter().enumerate() {
-        let near = selected(id)
-            || index.checked_sub(1).is_some_and(|i| selected(&ids[i]))
-            || ids.get(index + 1).is_some_and(selected);
-        if !near {
-            omitted = true;
-            continue;
-        }
-        if omitted {
-            parts.push("…".into());
-            omitted = false;
-        }
-        parts.push(format!(
-            "{}{}. {}",
-            if selected(id) { "• " } else { "" },
-            index + 1,
-            label(p, *id)
-        ));
-    }
-    if omitted {
-        parts.push("…".into());
-    }
-    parts.join("\n")
-}
-
-pub(super) fn panel(app: &App, viewport: Option<Size>) -> Option<Element<'_, Message>> {
-    let session = app.scenario_reorder.session.as_ref()?;
-    let p = app.project();
-    let state = &app.scenario_reorder;
-    let query = state.query.to_lowercase();
-    let slots = session
-        .before()
-        .iter()
-        .copied()
-        .map(Some)
-        .chain(std::iter::once(None))
-        .enumerate()
-        .map(|(index, before)| {
-            let slot = Slot {
-                parent: session.parent(),
-                before,
-            };
-            let title = before.map_or_else(
-                || "End of sequence".into(),
-                |id| format!("Before {}. {}", index + 1, label(p, id)),
-            );
-            (slot, title)
-        })
-        .filter(|(slot, title)| {
-            title.to_lowercase().contains(&query)
-                || slot
-                    .before
-                    .and_then(|id| p.elements.get(&id))
-                    .is_some_and(|e| {
-                        e.name.to_lowercase().contains(&query)
-                            || e.alias.to_lowercase().contains(&query)
-                    })
-        })
-        .collect::<Vec<_>>();
-    let pages = slots.len().div_ceil(PAGE_SIZE).max(1);
-    let page = state.page.min(pages - 1);
-    let mut choices = column![].spacing(4).width(Fill);
-    for (slot, title) in slots.iter().skip(page * PAGE_SIZE).take(PAGE_SIZE) {
-        choices = choices.push(
-            button(
-                text(title.clone())
-                    .size(12)
-                    .width(Fill)
-                    .wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-            )
-            .width(Fill)
-            .on_press(message(session, Intent::Choose(*slot))),
-        );
-    }
-    if slots.is_empty() {
-        choices = choices
-            .push(text("No matching destination. Try its name, alias or position.").size(12));
-    }
-    let mut body = column![
-        text(format!(
-            "Reorder {} selected",
-            session.snapshot().targets().len()
-        ))
-        .size(17),
-        text(format!("Sequence: {}", label(p, session.parent())))
-            .size(12)
-            .width(Fill)
-            .wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-        text("Changes execution order; saved positions stay as authored.").size(12),
-        text_input("Find destination by name, alias or position", &state.query)
-            .id(query_id(session.token()))
-            .on_input(move |query| message(session, Intent::Query(query)))
-            .on_submit_maybe(
-                (slots.len() == 1).then(|| message(session, Intent::Choose(slots[0].0)))
-            )
-            .size(13),
-        choices,
-        row![
-            button("Previous")
-                .on_press_maybe((page > 0).then(|| message(session, Intent::Page(page - 1)))),
-            text(format!("{} / {pages}", page + 1)).size(12),
-            button("Next").on_press_maybe(
-                (page + 1 < pages).then(|| message(session, Intent::Page(page + 1)))
-            )
-        ]
-        .spacing(8),
-    ]
-    .spacing(8)
-    .width(Fill);
-    let mut apply = None;
-    let mut footer =
-        column![text("Enter previews a unique match. Ctrl+Enter applies; Esc cancels.").size(12)]
-            .spacing(6);
-    if let Some(preview) = session.current_preview() {
-        footer = footer.push(
-            text(format!(
-                "Destination: {}",
-                destination(p, session.before(), preview.slot)
-            ))
-            .size(13)
-            .width(Fill)
-            .wrapping(iced::widget::text::Wrapping::WordOrGlyph),
-        );
-        let comparison = row![
-            container(
-                column![
-                    text("Before").size(13),
-                    text(order(p, &preview.before, session.snapshot()))
-                        .size(12)
-                        .width(Fill)
-                        .wrapping(iced::widget::text::Wrapping::WordOrGlyph)
-                ]
-                .width(Fill)
-            )
-            .width(Fill)
-            .id("scenario-reorder-before"),
-            container(
-                column![
-                    text("After • selected").size(13),
-                    text(order(p, &preview.after, session.snapshot()))
-                        .size(12)
-                        .width(Fill)
-                        .wrapping(iced::widget::text::Wrapping::WordOrGlyph)
-                ]
-                .width(Fill)
-            )
-            .width(Fill)
-            .id("scenario-reorder-after")
-        ]
-        .spacing(10)
-        .width(Fill);
-        body = body.push(comparison);
-        let feedback = match &preview.outcome {
-            reorder_session::Outcome::Refused(reason) => reason.clone(),
-            _ if !preview.selection_visible => {
-                "This destination would hide a selected occurrence; choose another destination."
-                    .into()
-            }
-            _ => match preview.presentation.as_ref().map(|shown| shown.status()) {
-                Some(PresentationStatus::Unavailable { .. }) | None => {
-                    "This order cannot be displayed; choose another destination.".into()
-                }
-                Some(status) => {
-                    apply = Some(message(session, Intent::Finish(preview.slot)));
-                    if matches!(status, PresentationStatus::Fallback { .. }) {
-                        "Apply will display an automatic arrangement. Your requested saved view and authored positions are retained; they are not repaired.".into()
-                    } else if matches!(preview.outcome, reorder_session::Outcome::Noop) {
-                        "This destination keeps the current order; Apply will close without an edit.".into()
-                    } else {
-                        "The selected occurrences move together in their existing order. One Undo restores the sequence.".into()
-                    }
-                }
-            },
-        };
-        footer = footer.push(text(feedback).size(12));
-    } else {
-        body = body.push(text("Choose a destination to preview the new sequence.").size(12));
-    }
-    let height = viewport.map_or(500., |size| (size.height - 32.).max(100.));
-    let card = column![
-        scrollable(body)
-            .height(Fill)
-            .width(Fill)
-            .spacing(8)
-            .id("scenario-reorder-body"),
-        footer,
-        row![
-            button("Cancel (Esc)").on_press(message(session, Intent::Cancel)),
-            button("Apply order (Ctrl+Enter)").on_press_maybe(apply)
-        ]
-        .spacing(8)
-    ]
-    .spacing(10);
-    Some(
-        container(opaque(
-            container(card)
-                .padding(12)
-                .width(480)
-                .height(height.min(630.))
-                .style(style::card),
-        ))
-        .align_right(Fill)
-        .padding(8)
-        .into(),
-    )
-}

crates/oa-desktop/src/behavior/scenario/selection.rs

@@ -1,54 +0,0 @@
-//! Captured exact Scenario selection input; membership grants no movement permission.
-use super::{Context, presentation};
-use crate::{
-    app::multiselect::Choice,
-    diagram_selection,
-    diagram_usage::{Surface, Target},
-};
-use oa_core::{Id, Project};
-#[derive(Debug, Clone)]
-pub(crate) struct Event {
-    pub context: Context,
-    pub snapshot: diagram_selection::Snapshot,
-    pub intent: Intent,
-}
-#[derive(Debug, Clone)]
-pub(crate) enum Intent {
-    Choose(Target, Choice),
-    Clear,
-    Collapse(Target),
-    Refuse(String),
-}
-pub(crate) fn context(context: Context) -> diagram_selection::Context {
-    diagram_selection::Context {
-        scope: diagram_selection::Scope {
-            document: context.document,
-            surface: match context.representation {
-                super::Representation::Derived { owner } => Surface::Scenario(owner),
-                super::Representation::Saved { diagram } => Surface::Saved(diagram),
-            },
-        },
-        revision: context.revision,
-        epoch: context.epoch,
-    }
-}
-pub(crate) fn visible(project: &Project, context: Context, selected: Id) -> Vec<Target> {
-    let shown = presentation::present(project, context.representation, selected);
-    shown
-        .scene()
-        .map_or_else(Vec::new, |scene| scene.selection_targets())
-}
-pub(crate) fn message(
-    context: Context,
-    snapshot: &diagram_selection::Snapshot,
-    intent: Intent,
-) -> crate::app::Message {
-    crate::app::Message::ScenarioCanvas(super::CanvasEvent::Selection(Box::new(Event {
-        context,
-        snapshot: snapshot.clone(),
-        intent,
-    })))
-}
-
-#[cfg(test)]
-mod tests;

crates/oa-desktop/src/behavior/scenario/selection/tests.rs

@@ -1,268 +0,0 @@
-use super::*;
-use crate::behavior::{
-    Scene, SequenceInput,
-    scenario::{self, CanvasEvent, CanvasTool},
-};
-use crate::diagram_selection::Selection;
-use iced::{
-    Point, Rectangle, Vector, mouse,
-    widget::canvas::{self, Program},
-};
-
-fn fixture(group: bool) -> (scenario::direct_tests::Fixture, Scene, Point) {
-    let f = scenario::direct_tests::fixture();
-    let context = scenario::direct_tests::context(f.owner);
-    let mut scene = Scene::sequence(&f.project, f.owner, f.reply);
-    scene.interaction = Some((context, CanvasTool::Select, true));
-    let mut selection = Selection::new(super::context(context).scope);
-    selection.add(Target::ScenarioObject(f.call), |_| true);
-    if group {
-        selection.add(Target::ScenarioObject(f.reply), |_| true);
-    }
-    scene.selection = Some((
-        context,
-        selection.snapshot(super::context(context)).unwrap(),
-    ));
-    let line = scene.lines.iter().find(|line| line.id == f.call).unwrap();
-    let point = line.label_at + Vector::new(8., 8.);
-    assert_eq!(scene.hit(point), Some(f.call));
-    (f, scene, point)
-}
-fn send(
-    scene: &Scene,
-    state: &mut SequenceInput,
-    event: canvas::Event,
-    point: Option<Point>,
-) -> Option<CanvasEvent> {
-    scene
-        .update(
-            state,
-            &event,
-            Rectangle::new(Point::ORIGIN, scene.size),
-            point.map_or(mouse::Cursor::Unavailable, mouse::Cursor::Available),
-        )
-        .and_then(|action| action.into_inner().0)
-        .and_then(|message| match message {
-            crate::app::Message::ScenarioCanvas(event) => Some(event),
-            _ => None,
-        })
-}
-fn mouse_event(event: mouse::Event) -> canvas::Event {
-    canvas::Event::Mouse(event)
-}
-
-#[test]
-fn saved_group_body_press_emits_one_spacing_lifetime_without_collapsing_selection() {
-    use crate::behavior::scenario::spacing::{self, Event};
-    use crate::behavior::scenario_layout::{Representation, resolve};
-    let (doc, owner, diagram, _, first) = spacing::controller::tests::fixture();
-    let second = doc
-        .project()
-        .identities()
-        .into_iter()
-        .find(|(_, a)| *a == "second")
-        .unwrap()
-        .0;
-    let mut context = scenario::direct_tests::context(owner);
-    context.representation = Representation::Saved { diagram };
-    let mut scene = resolve(doc.project(), context.representation, second)
-        .unwrap()
-        .scene;
-    let mut selection = Selection::new(super::context(context).scope);
-    selection.add(Target::ScenarioObject(first), |_| true);
-    selection.add(Target::ScenarioObject(second), |_| true);
-    let snapshot = selection.snapshot(super::context(context)).unwrap();
-    let stamp = spacing::Stamp {
-        context,
-        camera_epoch: 9,
-        selection_generation: snapshot.generation(),
-    };
-    scene.selection = Some((context, snapshot.clone()));
-    scene.selected = second;
-    scene.interaction = Some((context, CanvasTool::Select, true));
-    scene.coordinate_input = true;
-    scene.spacing_stamp = Some(stamp);
-    let line = scene.lines.iter().find(|line| line.id == first).unwrap();
-    let point = Point::new((line.points[0].x + line.points[1].x) / 2., line.points[0].y);
-    assert_eq!(scene.hit(point), Some(first));
-    let mut input = SequenceInput::default();
-    let Some(CanvasEvent::Spacing(Event::Begin {
-        stamp: got,
-        token,
-        target,
-        ..
-    })) = send(
-        &scene,
-        &mut input,
-        mouse_event(mouse::Event::ButtonPressed(mouse::Button::Left)),
-        Some(point),
-    )
-    else {
-        panic!("group spacing begins on first press")
-    };
-    assert_eq!(got, stamp);
-    assert_eq!(target, spacing::Target::Message(first));
-    assert!(input.group_press.is_none());
-    let moved = point + Vector::new(0., 24.);
-    assert!(
-        matches!(send(&scene,&mut input,mouse_event(mouse::Event::CursorMoved{position:moved}),Some(moved)),Some(CanvasEvent::Spacing(Event::Move{stamp:s,token:t,..})) if s==stamp && t==token)
-    );
-    assert!(
-        matches!(send(&scene,&mut input,mouse_event(mouse::Event::ButtonReleased(mouse::Button::Left)),Some(moved)),Some(CanvasEvent::Spacing(Event::Finish{stamp:s,token:t,..})) if s==stamp && t==token)
-    );
-    assert_eq!(scene.selection, Some((context, snapshot)));
-    assert_eq!(scene.selected, second);
-    assert!(input.press.is_none() && input.group_press.is_none());
-}
-#[test]
-fn group_press_retains_snapshot_and_collapses_only_stationary_release_once() {
-    let (f, scene, point) = fixture(true);
-    let mut state = SequenceInput::default();
-    assert!(
-        send(
-            &scene,
-            &mut state,
-            mouse_event(mouse::Event::ButtonPressed(mouse::Button::Left)),
-            Some(point)
-        )
-        .is_none()
-    );
-    assert!(state.press.is_none());
-    let captured = state.group_press.as_ref().unwrap().snapshot.clone();
-    assert_eq!(captured.primary(), Some(&Target::ScenarioObject(f.reply)));
-    let Some(CanvasEvent::Selection(event)) = send(
-        &scene,
-        &mut state,
-        mouse_event(mouse::Event::ButtonReleased(mouse::Button::Left)),
-        Some(point),
-    ) else {
-        panic!("captured collapse")
-    };
-    assert_eq!(event.snapshot, captured);
-    assert!(matches!(event.intent, Intent::Collapse(Target::ScenarioObject(id)) if id == f.call));
-    assert!(
-        send(
-            &scene,
-            &mut state,
-            mouse_event(mouse::Event::ButtonReleased(mouse::Button::Left)),
-            Some(point)
-        )
-        .is_none()
-    );
-}
-#[test]
-fn crossed_threshold_return_to_origin_refuses_whole_set_and_outside_release_cancels() {
-    for outside in [false, true] {
-        let (_, scene, point) = fixture(true);
-        let mut state = SequenceInput::default();
-        send(
-            &scene,
-            &mut state,
-            mouse_event(mouse::Event::ButtonPressed(mouse::Button::Left)),
-            Some(point),
-        );
-        let moved = point + Vector::new(12., 0.);
-        send(
-            &scene,
-            &mut state,
-            mouse_event(mouse::Event::CursorMoved { position: moved }),
-            Some(moved),
-        );
-        send(
-            &scene,
-            &mut state,
-            mouse_event(mouse::Event::CursorMoved { position: point }),
-            Some(point),
-        );
-        let event = send(
-            &scene,
-            &mut state,
-            mouse_event(mouse::Event::ButtonReleased(mouse::Button::Left)),
-            (!outside).then_some(point),
-        );
-        if outside {
-            assert!(event.is_none());
-        } else {
-            let Some(CanvasEvent::Selection(event)) = event else {
-                panic!("whole-set refusal")
-            };
-            assert!(matches!(event.intent, Intent::Refuse(_)));
-            assert_eq!(event.snapshot.targets().len(), 2);
-        }
-        assert!(state.group_press.is_none() && state.press.is_none());
-    }
-}
-#[test]
-fn passive_shift_survives_context_refresh_and_window_loss_clears_it() {
-    let (f, mut scene, point) = fixture(false);
-    let mut state = SequenceInput::default();
-    assert!(
-        send(
-            &scene,
-            &mut state,
-            canvas::Event::Keyboard(iced::keyboard::Event::ModifiersChanged(
-                iced::keyboard::Modifiers::SHIFT
-            )),
-            Some(point)
-        )
-        .is_none()
-    );
-    let Some(CanvasEvent::Selection(event)) = send(
-        &scene,
-        &mut state,
-        mouse_event(mouse::Event::ButtonPressed(mouse::Button::Left)),
-        Some(point),
-    ) else {
-        panic!("toggle")
-    };
-    assert!(
-        matches!(event.intent, Intent::Choose(Target::ScenarioObject(id), Choice::Toggle) if id == f.call)
-    );
-    assert!(state.press.is_none());
-    scene.interaction.as_mut().unwrap().0.epoch += 1;
-    send(
-        &scene,
-        &mut state,
-        canvas::Event::Window(iced::window::Event::Unfocused),
-        None,
-    );
-    assert!(state.modifiers.is_empty());
-}
-#[test]
-fn stale_selection_and_fallback_release_do_not_move_primary() {
-    let (_, mut scene, point) = fixture(true);
-    scene.coordinate_input = false;
-    let mut state = SequenceInput::default();
-    send(
-        &scene,
-        &mut state,
-        mouse_event(mouse::Event::ButtonPressed(mouse::Button::Left)),
-        Some(point),
-    );
-    let Some(CanvasEvent::Selection(event)) = send(
-        &scene,
-        &mut state,
-        mouse_event(mouse::Event::ButtonReleased(mouse::Button::Left)),
-        Some(point),
-    ) else {
-        panic!("fallback stationary selection remains usable")
-    };
-    assert!(matches!(event.intent, Intent::Collapse(_)));
-    send(
-        &scene,
-        &mut state,
-        mouse_event(mouse::Event::ButtonPressed(mouse::Button::Left)),
-        Some(point),
-    );
-    scene.selection.as_mut().unwrap().0.visit = Id::new_v4();
-    assert!(
-        send(
-            &scene,
-            &mut state,
-            mouse_event(mouse::Event::ButtonReleased(mouse::Button::Left)),
-            Some(point)
-        )
-        .is_none()
-    );
-    assert!(state.group_press.is_none());
-}

crates/oa-desktop/src/behavior/scenario/spacing.rs

@@ -5,17 +5,13 @@
 use crate::behavior::scenario_layout::{
     GeometryIssue, Representation, ResolvedScenarioPlan, presentation::checked_owner, resolve,
 };
-use crate::diagram_usage::Target as SelectionTarget;
 use oa_core::{
     Command, Id, Kind, OccurrenceBody, OccurrenceEndpoint, Project, ScenarioLanePosition,
     ScenarioMessagePosition, SharedBody, execute_batch,
 };
-use std::collections::BTreeSet;
 
 pub(crate) mod controller;
 #[cfg(test)]
-mod group_tests;
-#[cfg(test)]
 mod tests;
 pub(crate) use controller::{Event, Stamp};
 
@@ -34,7 +30,6 @@ impl Target {
 
 #[derive(Debug, PartialEq, Eq)]
 pub(crate) enum Refusal {
-    InvalidSelection(&'static str),
     InvalidSavedView(Id),
     TargetNotRendered(Target),
     InvalidDelta,
@@ -50,7 +45,6 @@ pub(super) struct Drag {
     diagram: Id,
     target: Target,
     origin: f32,
-    other_origins: Vec<(Target, f32)>,
     original_geometry: ResolvedScenarioPlan,
 }
 
@@ -64,135 +58,17 @@ pub(super) struct Preview {
 /// Capture an accepted, actually drawn target. A Saved view displaying automatic
 /// fallback is not an editable original, even if the target appears in fallback.
 pub(super) fn capture(project: &Project, diagram: Id, target: Target) -> Result<Drag, Refusal> {
-    capture_targets(project, diagram, target, &[target])
-}
-
-/// The exact selected set is one operation, never an eligible subset. Selection
-/// order and the pressed member do not determine persistence order.
-pub(super) fn capture_group(
-    project: &Project,
-    diagram: Id,
-    pressed: Target,
-    targets: &[SelectionTarget],
-) -> Result<Drag, Refusal> {
-    if targets.is_empty() {
-        return Err(Refusal::InvalidSelection(
-            "Select at least one occurrence to move.",
-        ));
-    }
-    let mut seen = BTreeSet::new();
-    let mut members = Vec::with_capacity(targets.len());
-    for selected in targets {
-        let SelectionTarget::ScenarioObject(id) = selected else {
-            return Err(Refusal::InvalidSelection(
-                "Move only local Scenario lifelines or messages.",
-            ));
-        };
-        if !seen.insert(*id) {
-            return Err(Refusal::InvalidSelection(
-                "The selection contains a duplicate occurrence.",
-            ));
-        }
-        let target = match pressed {
-            Target::Lane(_) => Target::Lane(*id),
-            Target::Message(_) => Target::Message(*id),
-        };
-        let Some(element) = project.elements.get(id) else {
-            return Err(Refusal::TargetNotRendered(target));
-        };
-        let same_role = match target {
-            Target::Lane(_) => element.kind() == Kind::Lifeline,
-            Target::Message(_) => matches!(
-                element.shared(),
-                Some(SharedBody::Occurrence {
-                    body: OccurrenceBody::Exchange { .. },
-                    ..
-                })
-            ),
-        };
-        if !same_role {
-            return Err(Refusal::InvalidSelection(
-                "Move a group of lifelines or a group of messages; mixed and other occurrence types are not supported.",
-            ));
-        }
-        members.push(target);
-    }
-    if !members.contains(&pressed) {
-        return Err(Refusal::InvalidSelection(
-            "The pressed occurrence is not in the captured selection.",
-        ));
-    }
-    members.sort_by_key(|target| target.id());
-    capture_targets(project, diagram, pressed, &members)
-}
-
-// Require the actual local sequence/operand path, not just an ancestor pointer.
-// Cross-operand groups are allowed; no member changes its existing parent.
-fn local_message(project: &Project, owner: Id, id: Id) -> bool {
-    let mut current = id;
-    let mut visited = BTreeSet::new();
-    while current != owner && visited.insert(current) {
-        let Some(element) = project.elements.get(&current) else {
-            return false;
-        };
-        let Some(parent) = element.parent.and_then(|id| project.elements.get(&id)) else {
-            return false;
-        };
-        if element.layer() != project.elements[&owner].layer() {
-            return false;
-        }
-        let listed = match parent.shared() {
-            Some(SharedBody::Occurrence {
-                body: OccurrenceBody::Fragment { branches, .. },
-                ..
-            }) => {
-                matches!(
-                    element.shared(),
-                    Some(SharedBody::Occurrence {
-                        body: OccurrenceBody::Branch { .. },
-                        ..
-                    })
-                ) && branches.iter().filter(|&&id| id == current).count() == 1
-            }
-            _ => parent
-                .steps()
-                .is_some_and(|steps| steps.iter().filter(|&&id| id == current).count() == 1),
-        };
-        if !listed {
-            return false;
-        }
-        current = parent.id;
-    }
-    current == owner
-}
-
-fn captured_origin(
-    project: &Project,
-    owner: Id,
-    geometry: &ResolvedScenarioPlan,
-    target: Target,
-) -> Result<f32, Refusal> {
+    let representation = Representation::Saved { diagram };
+    let owner = checked_owner(project, representation).ok_or(Refusal::InvalidSavedView(diagram))?;
+    let geometry = resolve(project, representation, target.id()).map_err(Refusal::Geometry)?;
     let element = project.elements.get(&target.id());
     let origin = match target {
         Target::Lane(id)
-            if element.is_some_and(|e| {
-                e.kind() == Kind::Lifeline
-                    && e.parent == Some(owner)
-                    && e.layer() == project.elements[&owner].layer()
-            }) =>
+            if element.is_some_and(|e| e.kind() == Kind::Lifeline && e.parent == Some(owner)) =>
         {
-            // Unassigned headers are still rendered local targets.
-            let headers = geometry
-                .scene
-                .boxes
-                .iter()
-                .filter(|item| {
-                    item.id == id && item.role == crate::behavior::SceneHitRole::LifelineHeader
-                })
-                .count();
-            (headers == 1)
-                .then(|| geometry.scene.render_lanes.get(&id).copied())
-                .flatten()
+            // Unassigned lifelines still have drawn headers. `scene.lanes`
+            // excludes them only from semantic message-endpoint hit testing.
+            geometry.scene.render_lanes.get(&id).copied()
         }
         Target::Message(id)
             if element.is_some_and(|e| {
@@ -203,16 +79,17 @@ fn captured_origin(
                         ..
                     })
                 )
-            }) && local_message(project, owner, id) =>
+            }) =>
         {
-            // A lifecycle receive row is not the stored send coordinate. Reject
-            // ambiguous repeated drawing IDs rather than choosing the first.
-            let mut lines = geometry.scene.lines.iter().filter(|line| line.id == id);
-            let first = lines
-                .next()
+            // A lifecycle row can denote receive y; the public position means
+            // send y. Read the actual outgoing endpoint, including self calls.
+            geometry
+                .scene
+                .lines
+                .iter()
+                .find(|line| line.id == id)
                 .and_then(|line| line.points.first())
-                .map(|point| point.y);
-            if lines.next().is_some() { None } else { first }
+                .map(|point| point.y)
         }
         _ => None,
     }
@@ -220,38 +97,11 @@ fn captured_origin(
     if !origin.is_finite() {
         return Err(Refusal::TargetNotRendered(target));
     }
-    Ok(origin)
-}
-
-fn capture_targets(
-    project: &Project,
-    diagram: Id,
-    target: Target,
-    targets: &[Target],
-) -> Result<Drag, Refusal> {
-    let representation = Representation::Saved { diagram };
-    let owner = checked_owner(project, representation).ok_or(Refusal::InvalidSavedView(diagram))?;
-    let geometry = resolve(project, representation, target.id()).map_err(Refusal::Geometry)?;
-    let origins = targets
-        .iter()
-        .map(|member| {
-            captured_origin(project, owner, &geometry, *member).map(|origin| (*member, origin))
-        })
-        .collect::<Result<Vec<_>, _>>()?;
-    let origin = origins
-        .iter()
-        .find(|(member, _)| *member == target)
-        .expect("admitted pressed member")
-        .1;
     Ok(Drag {
         original: project.clone(),
         diagram,
         target,
         origin,
-        other_origins: origins
-            .into_iter()
-            .filter(|(member, _)| *member != target)
-            .collect(),
         original_geometry: geometry,
     })
 }
@@ -267,50 +117,28 @@ impl Drag {
         if original_delta == 0. {
             return Ok(None);
         }
-        let mut commands = Vec::new();
-        for (target, origin) in
-            std::iter::once((self.target, self.origin)).chain(self.other_origins.iter().copied())
-        {
-            let position = (f64::from(origin) + f64::from(original_delta)) as f32;
-            if !position.is_finite() || position.abs() > oa_core::MAX_COORDINATE {
-                return Err(Refusal::Command(
-                    "Scenario positions must be finite and within the shared coordinate bounds."
-                        .into(),
-                ));
-            }
-            if position == origin {
-                continue;
-            }
-            let command = match target {
-                Target::Lane(lifeline) => Command::SetScenarioLanePosition {
-                    diagram: self.diagram,
-                    position: ScenarioLanePosition {
-                        lifeline,
-                        x: position,
-                    },
-                },
-                Target::Message(occurrence) => Command::SetScenarioMessagePosition {
-                    diagram: self.diagram,
-                    position: ScenarioMessagePosition {
-                        address: OccurrenceEndpoint {
-                            references: vec![],
-                            occurrence,
-                        },
-                        send_y: position,
-                    },
-                },
-            };
-            commands.push((target.id(), command));
-        }
-        if commands.is_empty() {
+        let position = (f64::from(self.origin) + f64::from(original_delta)) as f32;
+        if position == self.origin {
             return Ok(None);
         }
-        commands.sort_by_key(|(id, _)| *id);
-        let mut commands: Vec<_> = commands.into_iter().map(|(_, command)| command).collect();
-        let command = if self.other_origins.is_empty() {
-            commands.pop().expect("changed singleton")
-        } else {
-            Command::Batch(commands)
+        let command = match self.target {
+            Target::Lane(lifeline) => Command::SetScenarioLanePosition {
+                diagram: self.diagram,
+                position: ScenarioLanePosition {
+                    lifeline,
+                    x: position,
+                },
+            },
+            Target::Message(occurrence) => Command::SetScenarioMessagePosition {
+                diagram: self.diagram,
+                position: ScenarioMessagePosition {
+                    address: OccurrenceEndpoint {
+                        references: vec![],
+                        occurrence,
+                    },
+                    send_y: position,
+                },
+            },
         };
         let project = execute_batch(&self.original, std::slice::from_ref(&command))
             .map_err(|error| Refusal::Command(error.to_string()))?;

crates/oa-desktop/src/behavior/scenario/spacing/controller.rs

@@ -5,7 +5,6 @@ use crate::behavior::{
     scenario::{CanvasTool, Context, State},
     scenario_layout::Diagnostic,
 };
-use crate::{diagram_selection::Snapshot, diagram_usage::Target as SelectionTarget};
 use iced::{Point, Rectangle, Vector};
 
 #[cfg(test)]
@@ -17,7 +16,6 @@ mod timing_tests;
 pub struct Stamp {
     pub(crate) context: Context,
     pub(crate) camera_epoch: u64,
-    pub(crate) selection_generation: u64,
 }
 
 #[derive(Clone, Copy, Debug)]
@@ -74,14 +72,11 @@ pub(crate) struct Session {
     drag: Drag,
     preview: Option<Preview>,
     refusal: Option<Refusal>,
-    group_refusal: Option<Refusal>,
     ever_crossed: bool,
-    snapshot: Option<Snapshot>,
 }
 
 pub(in crate::behavior) struct Paint<'a> {
     pub(in crate::behavior) scene: &'a Scene,
-    pub(in crate::behavior) selected_count: usize,
     #[cfg(test)]
     pub(in crate::behavior) bounds: Rectangle,
     pub(in crate::behavior) refusal: Option<&'a Refusal>,
@@ -103,21 +98,7 @@ pub(crate) enum Finish {
 
 impl Session {
     fn configure(&self, scene: &mut Scene) {
-        scene.selected = self
-            .snapshot
-            .as_ref()
-            .filter(|s| s.targets().len() > 1)
-            .and_then(|s| match s.primary() {
-                Some(SelectionTarget::ScenarioObject(id)) => Some(*id),
-                _ => None,
-            })
-            .unwrap_or(self.drag.target.id());
-        scene.selection = self
-            .snapshot
-            .as_ref()
-            .filter(|s| s.targets().len() > 1)
-            .cloned()
-            .map(|s| (self.stamp.context, s));
+        scene.selected = self.drag.target.id();
         scene.scale = self.scale;
         scene.camera_pan = self.pan;
         scene.interaction = Some((self.stamp.context, CanvasTool::Select, true));
@@ -136,18 +117,8 @@ impl Session {
             Target::Lane(_) => screen.x - self.press_screen.x,
             Target::Message(_) => screen.y - self.press_screen.y,
         };
-        self.ever_crossed |= if self
-            .snapshot
-            .as_ref()
-            .is_some_and(|s| s.targets().len() > 1)
-        {
-            screen.distance(self.press_screen) >= 3.
-        } else {
-            distance.abs() >= 3.
-        };
-        if !self.ever_crossed || self.group_refusal.is_some() {
-            // A rejected whole set may retain a pressed singleton only as its
-            // original display witness. It must never prepare a partial move.
+        self.ever_crossed |= distance.abs() >= 3.;
+        if !self.ever_crossed {
             return;
         }
         match self.drag.prepare(distance / self.scale) {
@@ -168,9 +139,6 @@ impl State {
     pub(crate) fn spacing_stamp(&self) -> Option<Stamp> {
         self.spacing.as_ref().map(|s| s.stamp)
     }
-    pub(crate) fn spacing_snapshot(&self) -> Option<&Snapshot> {
-        self.spacing.as_ref()?.snapshot.as_ref()
-    }
     pub(crate) fn cancel_spacing(&mut self) -> bool {
         self.spacing.take().is_some()
     }
@@ -181,55 +149,28 @@ impl State {
         camera_epoch: u64,
     ) -> Option<Paint<'_>> {
         let session = self.spacing.as_ref()?;
-        if session.stamp.context != context || session.stamp.camera_epoch != camera_epoch {
+        if session.stamp
+            != (Stamp {
+                context,
+                camera_epoch,
+            })
+        {
             return None;
         }
         let original = &session.drag.original_geometry;
         let shown = session.preview.as_ref().map_or(original, |p| &p.geometry);
         Some(Paint {
             scene: &shown.scene,
-            selected_count: session
-                .snapshot
-                .as_ref()
-                .map_or(1, |s| s.targets().len().max(1)),
             #[cfg(test)]
             bounds: shown.bounds,
-            refusal: session.refusal.as_ref().or_else(|| {
-                session
-                    .ever_crossed
-                    .then_some(session.group_refusal.as_ref())
-                    .flatten()
-            }),
+            refusal: session.refusal.as_ref(),
             original_diagnostics: &original.plan.diagnostics,
             original_latent: &original.latent_messages,
             diagnostics: &shown.plan.diagnostics,
         })
     }
 
-    #[cfg(test)]
     pub(crate) fn begin_spacing(&mut self, project: &Project, event: Event) -> Result<(), Refusal> {
-        self.begin_spacing_capture(project, event, None)
-    }
-    pub(crate) fn begin_spacing_with_snapshot(
-        &mut self,
-        project: &Project,
-        event: Event,
-        snapshot: Snapshot,
-    ) -> Result<(), Refusal> {
-        if snapshot.generation() != event.stamp().selection_generation
-            || snapshot.context()
-                != crate::behavior::scenario::selection::context(event.stamp().context)
-        {
-            return Err(Refusal::InvalidGesture);
-        }
-        self.begin_spacing_capture(project, event, Some(snapshot))
-    }
-    fn begin_spacing_capture(
-        &mut self,
-        project: &Project,
-        event: Event,
-        snapshot: Option<Snapshot>,
-    ) -> Result<(), Refusal> {
         let Event::Begin {
             stamp,
             token,
@@ -275,34 +216,7 @@ impl State {
         let Representation::Saved { diagram } = context.representation else {
             return Err(Refusal::InvalidGesture);
         };
-        let mut group_refusal = None;
-        let mut drag = if let Some(selected) = snapshot.as_ref().filter(|s| s.targets().len() > 1) {
-            if !selected
-                .targets()
-                .contains(&SelectionTarget::ScenarioObject(target.id()))
-            {
-                return Err(Refusal::TargetNotHit(target));
-            }
-            match capture_group(project, diagram, target, selected.targets()) {
-                Ok(drag) => drag,
-                Err(error)
-                    if matches!(
-                        &error,
-                        Refusal::InvalidSelection(_) | Refusal::TargetNotRendered(_)
-                    ) =>
-                {
-                    // Selection clicks do not require movement eligibility.
-                    // This capture supplies original paint and the exact hit
-                    // only; group_refusal forbids calling its prepare method.
-                    let original = capture(project, diagram, target)?;
-                    group_refusal = Some(error);
-                    original
-                }
-                Err(error) => return Err(error),
-            }
-        } else {
-            capture(project, diagram, target)?
-        };
+        let mut drag = capture(project, diagram, target)?;
         let camera = self.presentation.camera(drag.original_geometry.bounds);
         if self.presentation.viewport != Some(canvas_bounds.size())
             || camera.scale != scale
@@ -332,19 +246,7 @@ impl State {
         }
         // Configure baseline without changing the persistent camera or selection.
         let scene = &mut drag.original_geometry.scene;
-        scene.selected = snapshot
-            .as_ref()
-            .filter(|s| s.targets().len() > 1)
-            .and_then(|s| match s.primary() {
-                Some(SelectionTarget::ScenarioObject(id)) => Some(*id),
-                _ => None,
-            })
-            .unwrap_or(target.id());
-        scene.selection = snapshot
-            .as_ref()
-            .filter(|s| s.targets().len() > 1)
-            .cloned()
-            .map(|s| (context, s));
+        scene.selected = target.id();
         scene.scale = scale;
         scene.camera_pan = pan;
         scene.interaction = Some((context, CanvasTool::Select, true));
@@ -360,9 +262,7 @@ impl State {
             drag,
             preview: None,
             refusal: None,
-            group_refusal,
             ever_crossed: false,
-            snapshot,
         });
         Ok(())
     }
@@ -382,9 +282,6 @@ impl State {
         if !session.ever_crossed {
             return Ok(Finish::Click(session.drag.target.id()));
         }
-        if let Some(error) = session.group_refusal {
-            return Err(error);
-        }
         Ok(match session.preview {
             None => Finish::Noop,
             Some(preview) => Finish::Commit {

crates/oa-desktop/src/behavior/scenario/spacing/controller/tests.rs

@@ -95,7 +95,6 @@ pub(crate) fn packet(
         stamp: Stamp {
             context,
             camera_epoch,
-            selection_generation: 0,
         },
         token: Id::new_v4(),
         target,
@@ -136,55 +135,6 @@ fn press(event: Event) -> Point {
     press_screen
 }
 
-#[test]
-fn group_preview_keeps_captured_members_and_nonpressed_primary() {
-    use crate::diagram_selection::Selection;
-    use crate::diagram_usage::Target as Selected;
-    let (doc, mut state, mut event) = setup(true);
-    let context = event.stamp().context;
-    let first = match event {
-        Event::Begin { target, .. } => target.id(),
-        _ => unreachable!(),
-    };
-    let second = doc
-        .project()
-        .identities()
-        .into_iter()
-        .find(|(_, alias)| *alias == "second")
-        .unwrap()
-        .0;
-    let selection_context = crate::behavior::scenario::selection::context(context);
-    let mut selection = Selection::new(selection_context.scope);
-    selection.add(Selected::ScenarioObject(first), |_| true);
-    selection.add(Selected::ScenarioObject(second), |_| true);
-    let snapshot = selection.snapshot(selection_context).unwrap();
-    if let Event::Begin { stamp, .. } = &mut event {
-        stamp.selection_generation = snapshot.generation();
-    }
-    let start = press(event);
-    state
-        .begin_spacing_with_snapshot(doc.project(), event, snapshot.clone())
-        .unwrap();
-    for delta in [Vector::new(0., 0.), Vector::new(0., 24.)] {
-        state.move_spacing(start + delta);
-        let paint = state
-            .spacing_paint(context, event.stamp().camera_epoch)
-            .unwrap();
-        assert_eq!(paint.scene.selected, second);
-        assert_eq!(
-            paint.scene.selection.as_ref().unwrap(),
-            &(context, snapshot.clone())
-        );
-        assert_eq!(paint.selected_count, 2);
-    }
-    state.move_spacing(start + Vector::new(50., 0.));
-    assert!(matches!(
-        state.finish_spacing(start + Vector::new(50., 0.)).unwrap(),
-        Finish::Noop
-    ));
-    assert!(!doc.can_undo());
-}
-
 #[test]
 fn real_preview_moves_only_active_axis_from_original_and_never_changes_document() {
     for message in [false, true] {

crates/oa-desktop/src/behavior/scenario/spacing/group_tests.rs

@@ -1,675 +0,0 @@
-use super::*;
-use crate::document::Document;
-use oa_core::{Diagram, DiagramLayout, Layer, ProjectionKind, ScenarioLayout, language};
-
-fn id(project: &Project, alias: &str) -> Id {
-    project
-        .identities()
-        .into_iter()
-        .find(|(_, name)| *name == alias)
-        .unwrap()
-        .0
-}
-
-fn fixture(layout: Option<ScenarioLayout>) -> (Document, Id, Id) {
-    let mut project = language::parse(FIXTURE).unwrap();
-    let owner = id(&project, "conversation");
-    let right = id(&project, "right");
-    let mut views = Vec::new();
-    for (alias, layout) in [
-        ("active_view", layout),
-        (
-            "untouched_view",
-            Some(ScenarioLayout {
-                lanes: vec![ScenarioLanePosition {
-                    lifeline: right,
-                    x: 700.,
-                }],
-                messages: vec![],
-            }),
-        ),
-    ] {
-        let diagram = Id::new_v4();
-        project.diagrams.insert(
-            diagram,
-            Diagram {
-                id: diagram,
-                alias: alias.into(),
-                name: alias.into(),
-                description: "Preserve authored view metadata".into(),
-                layer: Layer::Oa,
-                projection: ProjectionKind::Scenario { scenario: owner },
-                nodes: Default::default(),
-                routes: vec![],
-                view_options: Default::default(),
-                layout: layout.map(DiagramLayout::Scenario),
-            },
-        );
-        views.push(diagram);
-    }
-    (
-        Document::from_project(project, Default::default()).unwrap(),
-        views[0],
-        views[1],
-    )
-}
-
-fn targets(ids: &[Id]) -> Vec<SelectionTarget> {
-    ids.iter()
-        .copied()
-        .map(SelectionTarget::ScenarioObject)
-        .collect()
-}
-
-fn message(occurrence: Id, send_y: f32) -> ScenarioMessagePosition {
-    ScenarioMessagePosition {
-        address: OccurrenceEndpoint {
-            references: vec![],
-            occurrence,
-        },
-        send_y,
-    }
-}
-
-// Literal expected authored payload, not another execution of planner commands.
-fn expected(
-    project: &Project,
-    diagram: Id,
-    lanes: Vec<ScenarioLanePosition>,
-    messages: Vec<ScenarioMessagePosition>,
-) -> Project {
-    let mut result = project.clone();
-    result.diagrams.get_mut(&diagram).unwrap().layout =
-        Some(DiagramLayout::Scenario(ScenarioLayout { lanes, messages }));
-    result
-}
-
-fn exact_transaction(mut document: Document, preview: Preview, expected: Project) {
-    let original = document.snapshot();
-    let revision = document.revision();
-    assert_eq!(preview.project, expected);
-    assert!(matches!(&preview.command, Command::Batch(_)));
-    document.execute(preview.command).unwrap();
-    assert_eq!(document.project(), &expected);
-    assert_eq!(document.revision(), revision + 1);
-    let changed = document.bundle().clone();
-    assert_ne!(changed, original.bundle);
-    assert_eq!(
-        language::parse(&language::format(document.project())).unwrap(),
-        expected
-    );
-    assert!(document.undo());
-    assert_eq!(document.project(), &original.decoded.project);
-    assert_eq!(document.bundle(), &original.bundle);
-    assert!(!document.can_undo());
-    assert!(document.redo());
-    assert_eq!(document.project(), &expected);
-    assert_eq!(document.bundle(), &changed);
-    assert!(!document.can_redo());
-    let reopened = Document::from_bundle(changed, Default::default()).unwrap();
-    assert_eq!(reopened.project(), &expected);
-    assert!(!reopened.dirty() && !reopened.can_undo());
-}
-
-#[test]
-fn group_messages_move_from_each_original_with_press_and_selection_order_independent() {
-    let (document, diagram, other) = fixture(None);
-    let before = document.project();
-    let first = id(before, "first");
-    let second = id(before, "second");
-    let wanted = expected(
-        before,
-        diagram,
-        vec![],
-        vec![message(first, 188.), message(second, 280.)],
-    );
-    for members in [[first, second], [second, first]] {
-        for pressed in [first, second] {
-            let drag = capture_group(
-                before,
-                diagram,
-                Target::Message(pressed),
-                &targets(&members),
-            )
-            .unwrap();
-            let preview = drag.prepare(40.).unwrap().unwrap();
-            assert_eq!(preview.project, wanted);
-            assert_eq!(preview.project.diagrams[&other], before.diagrams[&other]);
-            assert_eq!(drag.original, *before);
-        }
-    }
-    let preview = capture_group(
-        before,
-        diagram,
-        Target::Message(second),
-        &targets(&[second, first]),
-    )
-    .unwrap()
-    .prepare(40.)
-    .unwrap()
-    .unwrap();
-    exact_transaction(document, preview, wanted);
-}
-
-#[test]
-fn group_lanes_vacate_each_others_space_in_one_candidate_and_one_history_entry() {
-    let (document, diagram, _) = fixture(None);
-    let before = document.project();
-    let left = id(before, "left");
-    let right = id(before, "right");
-    // Moving only Left into Right's old x cannot render a distinct-endpoint arrow.
-    assert!(matches!(
-        capture(before, diagram, Target::Lane(left))
-            .unwrap()
-            .prepare(240.),
-        Err(Refusal::Geometry(_))
-    ));
-    let wanted = expected(
-        before,
-        diagram,
-        vec![
-            ScenarioLanePosition {
-                lifeline: left,
-                x: 400.,
-            },
-            ScenarioLanePosition {
-                lifeline: right,
-                x: 640.,
-            },
-        ],
-        vec![],
-    );
-    for pressed in [left, right] {
-        let preview = capture_group(
-            before,
-            diagram,
-            Target::Lane(pressed),
-            &targets(&[right, left]),
-        )
-        .unwrap()
-        .prepare(240.)
-        .unwrap()
-        .unwrap();
-        assert_eq!(preview.project, wanted);
-        assert_eq!(preview.geometry.scene.render_lanes[&left], 400.);
-        assert_eq!(preview.geometry.scene.render_lanes[&right], 640.);
-    }
-    let preview = capture_group(
-        before,
-        diagram,
-        Target::Lane(right),
-        &targets(&[left, right]),
-    )
-    .unwrap()
-    .prepare(240.)
-    .unwrap()
-    .unwrap();
-    exact_transaction(document, preview, wanted);
-}
-
-#[test]
-fn self_call_and_reply_are_validated_together_but_partial_candidate_is_refused() {
-    let (document, diagram, _) = fixture(None);
-    let before = document.project();
-    let call = id(before, "call");
-    let reply = id(before, "reply");
-    let first = id(before, "first");
-    assert!(matches!(
-        capture(before, diagram, Target::Message(call))
-            .unwrap()
-            .prepare(118.),
-        Err(Refusal::Geometry(_))
-    ));
-    let drag = capture_group(
-        before,
-        diagram,
-        Target::Message(reply),
-        &targets(&[reply, call]),
-    )
-    .unwrap();
-    let preview = drag.prepare(118.).unwrap().unwrap();
-    assert_eq!(
-        preview.project,
-        expected(
-            before,
-            diagram,
-            vec![],
-            vec![message(call, 450.), message(reply, 542.)]
-        )
-    );
-    let line = preview
-        .geometry
-        .scene
-        .lines
-        .iter()
-        .find(|line| line.id == call)
-        .unwrap();
-    assert_eq!(line.points.first().unwrap().y, 450.);
-    assert_eq!(line.points.last().unwrap().y, 474.);
-    let partial = capture_group(
-        before,
-        diagram,
-        Target::Message(first),
-        &targets(&[first, call]),
-    )
-    .unwrap();
-    assert!(matches!(partial.prepare(118.), Err(Refusal::Geometry(_))));
-    assert_eq!(partial.original, *before);
-    assert!(!document.can_undo());
-}
-
-#[test]
-fn exact_set_admission_rejects_empty_duplicates_mixed_unsupported_missing_and_unpressed() {
-    let (document, diagram, _) = fixture(None);
-    let before = document.project();
-    let first = id(before, "first");
-    let second = id(before, "second");
-    let left = id(before, "left");
-    let source = id(before, "source");
-    let unfinished = id(before, "unfinished");
-    for selection in [
-        vec![],
-        targets(&[first, first]),
-        targets(&[first, left]),
-        targets(&[first, source]),
-        targets(&[first, Id::new_v4()]),
-        targets(&[second]),
-        targets(&[first, unfinished]),
-        vec![
-            SelectionTarget::ScenarioObject(first),
-            SelectionTarget::Whole,
-        ],
-        vec![
-            SelectionTarget::ScenarioObject(first),
-            SelectionTarget::Placement(second),
-        ],
-    ] {
-        assert!(
-            capture_group(before, diagram, Target::Message(first), &selection).is_err(),
-            "{selection:?}"
-        );
-    }
-    assert!(
-        capture_group(
-            before,
-            Id::nil(),
-            Target::Message(first),
-            &targets(&[first, second])
-        )
-        .is_err()
-    );
-    assert!(
-        capture_group(
-            before,
-            diagram,
-            Target::Lane(first),
-            &targets(&[first, second])
-        )
-        .is_err()
-    );
-    assert!(!document.dirty() && !document.can_undo());
-}
-
-#[test]
-fn foreign_unlisted_and_ambiguous_local_messages_cannot_enter_a_group() {
-    let (document, diagram, _) = fixture(None);
-    let before = document.project();
-    let first = id(before, "first");
-    let second = id(before, "second");
-    let owner = id(before, "conversation");
-    for case in 0..3 {
-        let mut project = before.clone();
-        match case {
-            0 => {
-                let foreign = project
-                    .add_element(Kind::Scenario, Layer::Oa, "Foreign", None)
-                    .unwrap();
-                project.elements.get_mut(&second).unwrap().parent = Some(foreign);
-            }
-            1 => project
-                .elements
-                .get_mut(&owner)
-                .unwrap()
-                .steps_mut()
-                .unwrap()
-                .retain(|id| *id != second),
-            _ => project
-                .elements
-                .get_mut(&owner)
-                .unwrap()
-                .steps_mut()
-                .unwrap()
-                .push(second),
-        }
-        assert!(
-            capture_group(
-                &project,
-                diagram,
-                Target::Message(first),
-                &targets(&[first, second])
-            )
-            .is_err()
-        );
-    }
-}
-
-#[test]
-fn fallback_baseline_is_refused_before_any_zero_motion_can_be_planned() {
-    let (document, diagram, _) = fixture(None);
-    let call = id(document.project(), "call");
-    let reply = id(document.project(), "reply");
-    let invalid = expected(
-        document.project(),
-        diagram,
-        vec![],
-        vec![message(call, 450.)],
-    );
-    let shown = crate::behavior::scenario_layout::presentation::present(
-        &invalid,
-        Representation::Saved { diagram },
-        call,
-    );
-    assert!(shown.capabilities().geometry_navigation);
-    assert!(!shown.capabilities().coordinate_input);
-    assert!(matches!(
-        capture_group(
-            &invalid,
-            diagram,
-            Target::Message(reply),
-            &targets(&[reply, call])
-        ),
-        Err(Refusal::Geometry(_))
-    ));
-}
-
-#[test]
-fn group_noops_preserve_sparse_overrides_complete_source_and_existing_redo() {
-    for sparse in [true, false] {
-        let (mut document, diagram, _) = fixture((!sparse).then(ScenarioLayout::default));
-        let first = id(document.project(), "first");
-        let second = id(document.project(), "second");
-        let owner = id(document.project(), "conversation");
-        document
-            .execute(Command::Rename(owner, "Redo sentinel".into()))
-            .unwrap();
-        let redo = document.snapshot();
-        assert!(document.undo());
-        let original = document.snapshot();
-        let revision = document.revision();
-        let drag = capture_group(
-            document.project(),
-            diagram,
-            Target::Message(second),
-            &targets(&[second, first]),
-        )
-        .unwrap();
-        assert!(drag.prepare(30.).unwrap().is_some());
-        for delta in [0., -0., f32::from_bits(1)] {
-            assert!(drag.prepare(delta).unwrap().is_none());
-        }
-        assert!(std::sync::Arc::ptr_eq(&original, &document.snapshot()));
-        assert_eq!(document.bundle(), &original.bundle);
-        assert_eq!(document.revision(), revision);
-        assert_eq!(drag.original, original.decoded.project);
-        assert!(document.redo());
-        assert_eq!(document.project(), &redo.decoded.project);
-        assert_eq!(document.bundle(), &redo.bundle);
-    }
-}
-
-#[test]
-fn subprecision_unchanged_member_does_not_materialize_an_absent_override() {
-    let (document, diagram, _) = fixture(None);
-    let first = id(document.project(), "first");
-    let second = id(document.project(), "second");
-    let project = expected(
-        document.project(),
-        diagram,
-        vec![],
-        vec![message(first, 0.)],
-    );
-    let delta = 0.000001_f32;
-    assert_eq!(240_f32 + delta, 240.);
-    let preview = capture_group(
-        &project,
-        diagram,
-        Target::Message(second),
-        &targets(&[second, first]),
-    )
-    .unwrap()
-    .prepare(delta)
-    .unwrap()
-    .unwrap();
-    assert_eq!(
-        preview.project,
-        expected(&project, diagram, vec![], vec![message(first, delta)])
-    );
-    assert!(matches!(preview.command, Command::Batch(ref commands) if commands.len() == 1));
-}
-
-#[test]
-fn invalid_delta_or_one_out_of_bounds_member_refuses_the_whole_group() {
-    let (document, diagram, _) = fixture(None);
-    let left = id(document.project(), "left");
-    let right = id(document.project(), "right");
-    let project = expected(
-        document.project(),
-        diagram,
-        vec![ScenarioLanePosition {
-            lifeline: right,
-            x: 999_990.,
-        }],
-        vec![],
-    );
-    let drag = capture_group(
-        &project,
-        diagram,
-        Target::Lane(left),
-        &targets(&[left, right]),
-    )
-    .unwrap();
-    for delta in [f32::NAN, f32::INFINITY, f32::NEG_INFINITY] {
-        assert!(matches!(drag.prepare(delta), Err(Refusal::InvalidDelta)));
-    }
-    for delta in [20., f32::MAX, -f32::MAX] {
-        assert!(matches!(drag.prepare(delta), Err(Refusal::Command(_))));
-    }
-    assert_eq!(drag.original, project);
-    assert!(drag.prepare(0.).unwrap().is_none());
-}
-
-#[test]
-fn singleton_capture_group_retains_existing_singleton_command_and_result() {
-    let (document, diagram, _) = fixture(None);
-    for target in [
-        Target::Lane(id(document.project(), "right")),
-        Target::Message(id(document.project(), "second")),
-    ] {
-        let single = capture(document.project(), diagram, target)
-            .unwrap()
-            .prepare(25.)
-            .unwrap()
-            .unwrap();
-        let group = capture_group(
-            document.project(),
-            diagram,
-            target,
-            &targets(&[target.id()]),
-        )
-        .unwrap()
-        .prepare(25.)
-        .unwrap()
-        .unwrap();
-        assert_eq!(group.project, single.project);
-        assert!(!matches!(group.command, Command::Batch(_)));
-    }
-}
-
-#[test]
-fn existing_layout_order_and_unselected_values_are_preserved_exactly() {
-    let (document, diagram, _) = fixture(None);
-    let first = id(document.project(), "first");
-    let second = id(document.project(), "second");
-    let reply = id(document.project(), "reply");
-    let right = id(document.project(), "right");
-    let lanes = vec![ScenarioLanePosition {
-        lifeline: right,
-        x: 400.,
-    }];
-    let project = expected(
-        document.project(),
-        diagram,
-        lanes.clone(),
-        vec![message(reply, 424.), message(first, 148.)],
-    );
-    let preview = capture_group(
-        &project,
-        diagram,
-        Target::Message(second),
-        &targets(&[second, first]),
-    )
-    .unwrap()
-    .prepare(40.)
-    .unwrap()
-    .unwrap();
-    assert_eq!(
-        preview.project,
-        expected(
-            &project,
-            diagram,
-            lanes,
-            vec![
-                message(reply, 424.),
-                message(first, 188.),
-                message(second, 280.)
-            ]
-        )
-    );
-}
-
-#[test]
-fn local_messages_in_different_operands_move_without_reparenting_or_reordering() {
-    use crate::behavior::topology::occurrence;
-    let (document, diagram, _) = fixture(None);
-    let mut project = document.project().clone();
-    let owner = id(&project, "conversation");
-    let first = id(&project, "first");
-    let second = id(&project, "second");
-    let fragment = occurrence(
-        &project,
-        owner,
-        "Alternatives",
-        OccurrenceBody::Fragment {
-            operator: oa_core::FragmentOperator::Alternative,
-            branches: vec![],
-        },
-    );
-    let frame = fragment.id;
-    project.elements.insert(frame, fragment);
-    let mut branches = Vec::new();
-    for member in [first, second] {
-        let branch = occurrence(
-            &project,
-            frame,
-            "Operand",
-            OccurrenceBody::Branch {
-                guard: "ready".into(),
-                occurrences: vec![member],
-            },
-        );
-        let branch_id = branch.id;
-        project.elements.insert(branch_id, branch);
-        project.elements.get_mut(&member).unwrap().parent = Some(branch_id);
-        branches.push(branch_id);
-    }
-    if let Some(SharedBody::Occurrence {
-        body: OccurrenceBody::Fragment {
-            branches: items, ..
-        },
-        ..
-    }) = project.elements.get_mut(&frame).unwrap().shared_mut()
-    {
-        *items = branches.clone();
-    } else {
-        unreachable!();
-    }
-    let steps = project
-        .elements
-        .get_mut(&owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap();
-    steps.retain(|id| ![first, second].contains(id));
-    steps.insert(0, frame);
-    let document = Document::from_project(project, Default::default()).unwrap();
-    let project = document.project();
-    let baseline = resolve(project, Representation::Saved { diagram }, first).unwrap();
-    let original_send = |id| {
-        baseline
-            .scene
-            .lines
-            .iter()
-            .find(|line| line.id == id)
-            .unwrap()
-            .points[0]
-            .y
-    };
-    let preview = capture_group(
-        project,
-        diagram,
-        Target::Message(second),
-        &targets(&[second, first]),
-    )
-    .unwrap()
-    .prepare(-5.)
-    .unwrap()
-    .unwrap();
-    assert_eq!(
-        preview.project,
-        expected(
-            project,
-            diagram,
-            vec![],
-            vec![
-                message(first, original_send(first) - 5.),
-                message(second, original_send(second) - 5.)
-            ]
-        )
-    );
-    assert_eq!(preview.project.elements, project.elements);
-    let mut omitted = project.clone();
-    if let Some(SharedBody::Occurrence {
-        body: OccurrenceBody::Fragment {
-            branches: items, ..
-        },
-        ..
-    }) = omitted.elements.get_mut(&frame).unwrap().shared_mut()
-    {
-        items.retain(|id| *id != branches[1]);
-    }
-    assert!(
-        capture_group(
-            &omitted,
-            diagram,
-            Target::Message(first),
-            &targets(&[first, second])
-        )
-        .is_err()
-    );
-}
-
-const FIXTURE: &str = r#"arcadia 7;
-project spacing_group "Saved group spacing" id "71000000-0000-4000-8000-000000000001" {
- oa_activity source "Source" id "71000000-0000-4000-8000-000000000002" {}
- oa_activity target "Target" id "71000000-0000-4000-8000-000000000003" {}
- interaction exchange "Repeated exchange" id "71000000-0000-4000-8000-000000000004" { source @source; target @target; }
- oa_scenario conversation "Conversation" id "71000000-0000-4000-8000-000000000005" { viewpoint OperationalActivity; steps [@first, @second, @call, @reply, @unfinished]; }
- oa_lifeline left "Left" id "71000000-0000-4000-8000-000000000006" { parent @conversation; represented @source; }
- oa_lifeline right "Right" id "71000000-0000-4000-8000-000000000007" { parent @conversation; represented @target; }
- oa_occurrence first "First" id "71000000-0000-4000-8000-000000000008" { parent @conversation; body { Exchange { exchange @exchange; sender @left; receiver @right; message_kind Asynchronous; }; }; }
- oa_occurrence second "Second" id "71000000-0000-4000-8000-000000000009" { parent @conversation; body { Exchange { exchange @exchange; sender @left; receiver @right; message_kind Asynchronous; }; }; }
- oa_occurrence call "Call" id "71000000-0000-4000-8000-00000000000a" { parent @conversation; body { Exchange { exchange none; sender @right; receiver @right; message_kind Call; }; }; }
- oa_occurrence reply "Reply" id "71000000-0000-4000-8000-00000000000b" { parent @conversation; body { Exchange { exchange none; sender @right; receiver @right; message_kind Reply; reply_to @call; }; }; }
- oa_occurrence unfinished "Unfinished" id "71000000-0000-4000-8000-00000000000c" { parent @conversation; body { Exchange { exchange @exchange; sender @left; receiver none; message_kind Asynchronous; }; }; }
-}
-"#;

crates/oa-desktop/src/behavior/scenario/workspace.rs

@@ -75,7 +75,6 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
         .spacing(8)
         .into();
     };
-    let snapshot = app.multiselect_snapshot();
     let tool = state.canvas_tool(owner);
     let clean = !app.behavior.has_pending() && !app.draft_dirty() && !app.source_dirty();
     // Resolve once per accepted view. An active spacing session owns its exact
@@ -91,8 +90,7 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
         },
         ScenarioPresentation::capabilities,
     );
-    let coordinate_input =
-        clean && capabilities.coordinate_input && app.scenario_reorder.session.is_none();
+    let coordinate_input = clean && capabilities.coordinate_input;
     let notice = if let Some(paint) = &preview {
         display_notice_parts(
             p,
@@ -125,7 +123,6 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
         scenario_view: Some((context.representation, context.visit)),
     };
     let keyboard = clean
-        && app.scenario_reorder.session.is_none()
         && capabilities.geometry_navigation
         && super::super::canvas_workspace::keyboard_enabled(app);
     let camera = move |e| Message::ScenarioCanvas(CanvasEvent::Camera(context, scope.epoch, e));
@@ -141,21 +138,15 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
         scene.scale = camera_state.scale;
         scene.camera_pan = camera_state.pan;
         scene.interaction = Some((context, tool, clean));
-        scene.selection = snapshot.clone().map(|snapshot| (context, snapshot));
         scene.spacing_stamp = (coordinate_input
             && !app.source_rename.open()
             && keyboard
             && matches!(context.representation, Representation::Saved { .. }))
-        .then(|| {
-            snapshot.as_ref().map(|snapshot| spacing::Stamp {
-                context,
-                camera_epoch: app.camera_epoch,
-                selection_generation: snapshot.generation(),
-            })
-        })
-        .flatten();
-        scene.coordinate_input =
-            capabilities.coordinate_input && app.scenario_reorder.session.is_none();
+        .then_some(spacing::Stamp {
+            context,
+            camera_epoch: app.camera_epoch,
+        });
+        scene.coordinate_input = capabilities.coordinate_input;
         scene.pending_placement = coordinate_input
             .then(|| state.pending_placement(owner))
             .flatten();
@@ -167,27 +158,8 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
         // Keep this Stack in both branches: replacing the Canvas with a wrapper
         // on Begin would discard its pointer capture before Move/Finish.
         let mut layers = iced::widget::stack![raw_canvas];
-        if let Some((_, summary)) = &app.scenario_reorder.summary {
-            layers = layers.push(
-                container(iced::widget::opaque(
-                    container(
-                        text(format!("{summary} Use Undo to restore the previous order.")).size(12),
-                    )
-                    .padding(8)
-                    .style(style::card),
-                ))
-                .align_bottom(Fill)
-                .width(Fill)
-                .padding(8),
-            );
-        }
         if let Some(paint) = &preview {
             let feedback = spacing_feedback(p, paint.refusal, paint.diagnostics);
-            let feedback = if paint.selected_count > 1 {
-                format!("{} selected - {feedback}", paint.selected_count)
-            } else {
-                feedback
-            };
             layers = layers.push(
                 container(
                     container(text(feedback).size(12))
@@ -224,46 +196,7 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
         container(text("No supported canvas geometry is available. Inspect the model or open its source to repair this view."))
             .id("scenario-viewport-unavailable").padding(16).width(Fill).height(Fill).style(style::card).into()
     };
-    // The chooser must sit outside Viewport: that camera wrapper deliberately
-    // consumes Space, arrows and wheel before its child receives input.
-    let mut canvas_layers = iced::widget::stack![canvas];
-    if let Some(panel) = reorder_view::panel(app, presentation.viewport) {
-        canvas_layers = canvas_layers.push(panel);
-    }
-    let canvas = canvas_layers.into();
-    let selected_count = snapshot.as_ref().map_or(0, |s| s.targets().len());
-    let mut navigation = row![
-        out.width(Fill),
-        text(format!("{selected_count} selected")).size(12)
-    ]
-    .spacing(6);
-    let reorder = reorder_view::begin(app);
-    navigation = navigation.push(super::super::canvas_workspace::Control::new(
-        button(text("Reorder…").size(12))
-            .padding(6)
-            .on_press_maybe(reorder.clone()),
-        scope,
-        "Reorder",
-        keyboard,
-        reorder,
-        camera,
-    ));
-    if selected_count > 1 {
-        let removal = app
-            .scenario_removal_enabled()
-            .then(|| crate::app::scenario_removal::begin(app))
-            .flatten();
-        navigation = navigation.push(super::super::canvas_workspace::Control::new(
-            button(text("Remove…").size(12))
-                .padding(6)
-                .on_press_maybe(removal.clone()),
-            scope,
-            "Remove selected",
-            keyboard,
-            removal,
-            camera,
-        ));
-    }
+    let mut navigation = row![out.width(Fill)].spacing(6);
     if state.can_back(p, context) {
         navigation =
             navigation.push(button(text("Back").size(12)).padding(6).on_press_maybe(
@@ -329,12 +262,7 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
     let entries = [
         (
             "S",
-            if selected_count > 1 && matches!(context.representation, Representation::Saved { .. })
-            {
-                "Drag messages vertically or lifelines horizontally; Shift-click to change selection"
-            } else if selected_count > 1 {
-                "Shift-click to change selection; click a member to select only it"
-            } else if matches!(context.representation, Representation::Saved { .. }) {
+            if matches!(context.representation, Representation::Saved { .. }) {
                 "Select / move messages and lifelines"
             } else {
                 "Select / reorder occurrences"
@@ -415,15 +343,7 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
         }),
     );
     let mut details = column![
-        text(if selected_count > 1 {
-            format!(
-                "{selected_count} selected; properties: {}",
-                p.named(app.selected)
-            )
-        } else {
-            format!("Selected: {}", p.named(app.selected))
-        })
-        .size(12),
+        text(format!("Selected: {}", p.named(app.selected))).size(12),
         container(button(text("Properties").size(12)).on_press_maybe(
             (clean && properties_target(p, context, app.selected)).then_some(
                 Message::ScenarioCanvas(CanvasEvent::Properties(context, app.selected)),
@@ -447,7 +367,7 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
     let details = details_pane(
         context,
         state.scroll_restore(context, ScrollArea::Page),
-        sequence_rows(p, context, owner, details, clean, snapshot.as_ref()).into(),
+        sequence_rows(p, context, owner, details, clean).into(),
     );
     let mut form_panel = editor_panel(
         Id::nil(),
@@ -765,9 +685,7 @@ pub fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Element<'a
                 .into();
         }
     }
-    let editor = if app.scenario_reorder.session.is_some() {
-        None
-    } else if pending {
+    let editor = if pending {
         Some(form_panel)
     } else {
         presentation.shelf.map(|_| details)
@@ -806,13 +724,9 @@ fn display_notice_parts<'a>(
             for diagnostic in diagnostics.iter().take(3) {
                 let explanation = match diagnostic {
                     Diagnostic::SourceOrderCrossing { before, after, .. } => format!(
-                        "Saved positions place @{} below @{}, contrary to execution order.",
-                        p.elements
-                            .get(before)
-                            .map_or("?", |element| element.alias.as_str()),
-                        p.elements
-                            .get(after)
-                            .map_or("?", |element| element.alias.as_str())
+                        "Saved spacing places '{}' below '{}'. The Scenario order is unchanged.",
+                        p.named(*before),
+                        p.named(*after)
                     ),
                     Diagnostic::FrameExtendsPastFollowingAnchor { frame, following } => format!(
                         "Saved spacing makes '{}' overlap '{}'. Both keep their saved positions.",
@@ -837,7 +751,7 @@ fn display_notice_parts<'a>(
             if let Some(issue) = requested_issues.first() {
                 notice = notice.push(text(geometry_problem(p, issue)).size(12));
             }
-            notice = notice.push(text("Selection, navigation and Fit remain available. Coordinate editing requires repaired saved positions. Reorder uses explicit sequence destinations and previews its display consequences.").size(12));
+            notice = notice.push(text("Selection, navigation and Fit remain available. Canvas insertion and reordering are unavailable until the saved positions are repaired.").size(12));
         }
         PresentationStatus::Unavailable { .. } => {
             notice = notice.push(text("This view is unavailable. Its identity or automatic geometry cannot be resolved; the model and source remain available for inspection and repair.").size(12));
@@ -994,24 +908,7 @@ fn sequence_rows<'a>(
     owner: Id,
     mut out: Column<'a, Message>,
     enabled: bool,
-    snapshot: Option<&crate::diagram_selection::Snapshot>,
 ) -> Column<'a, Message> {
-    let choose = |id| {
-        snapshot.map_or_else(
-            || Message::ScenarioCanvas(CanvasEvent::Select(context, id)),
-            |snapshot| {
-                selection::message(
-                    context,
-                    snapshot,
-                    selection::Intent::Choose(
-                        crate::diagram_usage::Target::ScenarioObject(id),
-                        crate::app::multiselect::Choice::Replace,
-                    ),
-                )
-            },
-        )
-    };
-    let order_enabled = enabled && snapshot.is_none_or(|snapshot| snapshot.targets().len() <= 1);
     if let Some(SharedBody::Occurrence {
         body: OccurrenceBody::Fragment { branches, .. },
         ..
@@ -1020,10 +917,10 @@ fn sequence_rows<'a>(
         for branch in branches {
             out = out.push(sequence_action(
                 &format!("Operand: {}", p.named(*branch)),
-                choose(*branch),
+                Message::Select(*branch),
                 enabled,
             ));
-            out = sequence_rows(p, context, *branch, out, enabled, snapshot);
+            out = sequence_rows(p, context, *branch, out, enabled);
         }
     }
     if let Some(steps) = p.elements.get(&owner).and_then(|e| e.steps()) {
@@ -1032,17 +929,17 @@ fn sequence_rows<'a>(
                 row![
                     sequence_action(
                         &format!("{}. {}", i + 1, p.named(*id)),
-                        choose(*id),
+                        Message::Select(*id),
                         enabled
                     )
                     .width(Fill),
                     button("↑")
                         .padding(8)
-                        .on_press_maybe((order_enabled && i > 0).then_some(Message::Command(
+                        .on_press_maybe((enabled && i > 0).then_some(Message::Command(
                             Command::MoveStep(owner, i, i.saturating_sub(1))
                         ))),
                     button("↓").padding(8).on_press_maybe(
-                        (order_enabled && i + 1 < steps.len())
+                        (enabled && i + 1 < steps.len())
                             .then_some(Message::Command(Command::MoveStep(owner, i, i + 1)))
                     )
                 ]
@@ -1063,7 +960,7 @@ fn sequence_rows<'a>(
                     enabled,
                 ));
             }
-            out = sequence_rows(p, context, *id, out, enabled, snapshot);
+            out = sequence_rows(p, context, *id, out, enabled);
         }
     }
     out

crates/oa-desktop/src/behavior/scenario/workspace/details_tests.rs

@@ -388,16 +388,13 @@ fn opening_scenario_properties_cancels_held_spacing_and_rejects_its_late_finish(
         CanvasEvent::Viewport(c, Size::new(900., 600.))
     });
     open_details(&mut app);
-    let mut begin = packet(
+    let begin = packet(
         app.project(),
         &app.behavior.scenario,
         app.scenario_context().unwrap(),
         app.camera_epoch,
         Target::Message(message),
     );
-    if let Spacing::Begin { stamp, .. } = &mut begin {
-        stamp.selection_generation = app.multiselect_snapshot().unwrap().generation();
-    }
     let Spacing::Begin { press_screen, .. } = begin else {
         panic!()
     };
@@ -446,180 +443,3 @@ fn opening_scenario_properties_cancels_held_spacing_and_rejects_its_late_finish(
     assert!(Arc::ptr_eq(&snapshot, &app.document.snapshot()));
     assert!(!app.document.can_undo() && !app.document.can_redo());
 }
-
-#[tokio::test]
-async fn saved_selection_shift_survives_properties_focus_busy_rebuild_and_clears_on_window_loss() {
-    use crate::app::multiselect::Choice;
-    use crate::behavior::canvas_workspace::tests::focused;
-    use crate::diagram_usage::Target;
-
-    fn at(mounted: &mut Mounted, app: &App, target: Id) -> Point {
-        let context = app.scenario_context().unwrap();
-        let geometry = resolve(app.project(), context.representation, app.selected).unwrap();
-        let line = geometry
-            .scene
-            .lines
-            .iter()
-            .find(|line| line.id == target)
-            .unwrap();
-        let world = line.label_at + Vector::new(8., 8.);
-        assert_eq!(geometry.scene.hit_item(world).unwrap().id, target);
-        let bounds = mounted.geometry(app).bounds("scenario-viewport");
-        let camera = app.behavior.scenario.presentation.camera(geometry.bounds);
-        let point = bounds.position() + camera.pan + Vector::new(world.x, world.y) * camera.scale;
-        assert!(bounds.contains(point));
-        point
-    }
-    async fn focus_name(mounted: &mut Mounted, app: &mut App) -> Point {
-        let shown = mounted.geometry(app);
-        let (inspector, offset) = shown.scrolls[&widget::Id::new("inspector")];
-        let input = shown
-            .text_inputs
-            .iter()
-            .map(|bounds| bounds.center() - offset)
-            .filter(|point| inspector.contains(*point))
-            .min_by(|a, b| a.y.total_cmp(&b.y))
-            .expect("visible Name input");
-        mounted.click(app, input).await;
-        assert!(!focused(mounted, app, "viewport"));
-        assert!(
-            mounted
-                .geometry(app)
-                .focused
-                .iter()
-                .any(|(_, bounds, yes)| *yes && bounds.contains(input + offset))
-        );
-        assert!(!app.draft_dirty());
-        input
-    }
-    let shift = |held| {
-        iced::Event::Keyboard(keyboard::Event::ModifiersChanged(if held {
-            keyboard::Modifiers::SHIFT
-        } else {
-            keyboard::Modifiers::empty()
-        }))
-    };
-    let (mut app, diagram, first) = setup();
-    let second = id(&app, "updated_report");
-    let mut mounted = Mounted::new(&mut app).await;
-    open_details(&mut app);
-    mounted.settle(&mut app).await;
-    let shown = mounted.geometry(&app);
-    let (details, offset) = shown.scrolls[&widget::Id::new("scenario-details")];
-    let properties = shown.bounds("scenario-properties").center() - offset;
-    assert!(details.contains(properties));
-    mounted.click(&mut app, properties).await;
-    mounted.settle(&mut app).await;
-    let input = focus_name(&mut mounted, &mut app).await;
-    let before = app.document.snapshot();
-    let camera = stored_camera(&app);
-    let context = app.scenario_context().unwrap();
-    let selected = app.multiselect_snapshot().unwrap();
-    assert_eq!(selected.targets(), &[Target::ScenarioObject(first)]);
-    let passive = mounted
-        .batch(&mut app, &[shift(true)], mouse::Cursor::Available(input))
-        .await;
-    assert!(
-        !passive
-            .iter()
-            .any(|message| matches!(message, Message::ScenarioCanvas(_)))
-    );
-    assert!(!focused(&mut mounted, &app, "viewport"));
-    assert_eq!(app.multiselect_snapshot().unwrap(), selected);
-    let second_at = at(&mut mounted, &app, second);
-    let messages = mounted.click(&mut app, second_at).await;
-    assert_eq!(messages.iter().filter(|message| matches!(message,
-        Message::ScenarioCanvas(CanvasEvent::Selection(event))
-        if matches!(&event.intent, selection::Intent::Choose(Target::ScenarioObject(id), Choice::Toggle) if *id == second))).count(), 1);
-    assert!(!messages.iter().any(|message| matches!(
-        message,
-        Message::ScenarioCanvas(CanvasEvent::Spacing(_) | CanvasEvent::Reorder { .. })
-    )));
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        &[
-            Target::ScenarioObject(first),
-            Target::ScenarioObject(second)
-        ]
-    );
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().primary(),
-        Some(&Target::ScenarioObject(second))
-    );
-
-    app.busy = true;
-    mounted.settle(&mut app).await;
-    mounted
-        .batch(
-            &mut app,
-            &[shift(false)],
-            mouse::Cursor::Available(second_at),
-        )
-        .await;
-    app.busy = false;
-    mounted.settle(&mut app).await;
-    let first_at = at(&mut mounted, &app, first);
-    let messages = mounted.click(&mut app, first_at).await;
-    // Saved group clicks now complete the captured spacing lifetime; its
-    // stationary outcome must retain the same selection-only collapse.
-    assert!(messages.iter().any(|message| matches!(
-        message,
-        Message::ScenarioCanvas(CanvasEvent::Spacing(
-            super::super::spacing::Event::Finish { .. }
-        ))
-    )));
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        &[Target::ScenarioObject(first)]
-    );
-
-    let input = focus_name(&mut mounted, &mut app).await;
-    app.busy = true;
-    mounted.settle(&mut app).await;
-    mounted
-        .batch(&mut app, &[shift(true)], mouse::Cursor::Available(input))
-        .await;
-    app.busy = false;
-    mounted.settle(&mut app).await;
-    let second_at = at(&mut mounted, &app, second);
-    mounted.click(&mut app, second_at).await;
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        &[
-            Target::ScenarioObject(first),
-            Target::ScenarioObject(second)
-        ]
-    );
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().primary(),
-        Some(&Target::ScenarioObject(second))
-    );
-    mounted
-        .batch(
-            &mut app,
-            &[iced::Event::Window(iced::window::Event::Unfocused)],
-            mouse::Cursor::Unavailable,
-        )
-        .await;
-    let first_at = at(&mut mounted, &app, first);
-    mounted.click(&mut app, first_at).await;
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        &[Target::ScenarioObject(first)]
-    );
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().primary(),
-        Some(&Target::ScenarioObject(first))
-    );
-    assert_eq!(app.active_diagram, Some(diagram));
-    assert_eq!(
-        app.scenario_context().unwrap().representation,
-        context.representation
-    );
-    assert_eq!(app.scenario_context().unwrap().visit, context.visit);
-    assert_eq!(stored_camera(&app), camera);
-    assert!(Arc::ptr_eq(&before, &app.document.snapshot()));
-    assert_eq!(app.document.bundle(), &before.bundle);
-    assert!(!app.document.can_undo() && !app.document.can_redo());
-    assert!(app.behavior.scenario.spacing_token().is_none());
-}

crates/oa-desktop/src/behavior/scenario/workspace/spacing_tests.rs

@@ -436,204 +436,3 @@ async fn saved_drag_return_to_origin_preserves_redo_selection_and_original_fit_c
     assert_eq!(app.project(), &redo.decoded.project);
     assert_eq!(app.document.bundle(), &redo.bundle);
 }
-
-#[tokio::test]
-async fn saved_first_press_spaces_unselected_message_with_existing_singleton_selection() {
-    use crate::diagram_usage::Target;
-    let (mut app, mut mounted, diagram) = setup(false).await;
-    let initial = id(&app, "initial_report");
-    let target = id(&app, "updated_report");
-    let context = app.scenario_context().unwrap();
-    let snapshot = app.multiselect_snapshot().unwrap();
-    let task = app.update(selection::message(
-        context,
-        &snapshot,
-        selection::Intent::Choose(
-            Target::ScenarioObject(initial),
-            crate::app::multiselect::Choice::Replace,
-        ),
-    ));
-    mounted.perform(&mut app, task).await;
-    mounted.settle(&mut app).await;
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        &[Target::ScenarioObject(initial)]
-    );
-    let before = app.document.snapshot();
-    let revision = app.document.revision();
-    let context = app.scenario_context().unwrap();
-    let camera = stored_camera(&app);
-    let projected = screen(&mut mounted, &app, Point::new(400., 252.));
-    let start = Point::new(projected.x.round(), projected.y.round());
-    let geometry = resolved(&app);
-    let effective = app.behavior.scenario.presentation.camera(geometry.bounds);
-    assert_eq!(effective.scale, 0.5);
-    let bounds = mounted.geometry(&app).bounds("scenario-viewport");
-    let world = Point::new(
-        (start.x - bounds.x - effective.pan.x) / effective.scale,
-        (start.y - bounds.y - effective.pan.y) / effective.scale,
-    );
-    let hit = geometry.scene.hit_item(world).unwrap();
-    assert_eq!(hit.id, target);
-    assert_eq!(hit.role, crate::behavior::SceneHitRole::MessageBody);
-    let messages = press(&mut mounted, &mut app, start).await;
-    assert_eq!(
-        messages
-            .iter()
-            .filter(|message| matches!(
-                message,
-                Message::ScenarioCanvas(CanvasEvent::Spacing(spacing::Event::Begin { .. }))
-            ))
-            .count(),
-        1
-    );
-    assert!(
-        !messages
-            .iter()
-            .any(|message| matches!(message, Message::ScenarioCanvas(CanvasEvent::Selection(_))))
-    );
-    let token = app
-        .behavior
-        .scenario
-        .spacing_token()
-        .expect("first press starts saved spacing despite different selected singleton");
-    assert!(Arc::ptr_eq(&before, &app.document.snapshot()));
-    let end = start + Vector::new(0., 10.);
-    move_to(&mut mounted, &mut app, end).await;
-    mounted.settle(&mut app).await;
-    assert_eq!(app.behavior.scenario.spacing_token(), Some(token));
-    let messages = release(&mut mounted, &mut app, end).await;
-    assert_eq!(
-        messages
-            .iter()
-            .filter(|message| matches!(
-                message,
-                Message::ScenarioCanvas(CanvasEvent::Spacing(spacing::Event::Finish { .. }))
-            ))
-            .count(),
-        1
-    );
-    let mut expected = before.decoded.project.clone();
-    set_expected_message(&mut expected, diagram, target, 272.);
-    assert_eq!(app.project(), &expected);
-    assert_eq!(app.document.revision(), revision + 1);
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().targets(),
-        &[Target::ScenarioObject(target)]
-    );
-    assert_eq!(
-        app.multiselect_snapshot().unwrap().primary(),
-        Some(&Target::ScenarioObject(target))
-    );
-    assert!(app.behavior.scenario.spacing_token().is_none());
-    assert_eq!(stored_camera(&app), camera);
-    assert_eq!(
-        app.scenario_context().unwrap().representation,
-        context.representation
-    );
-    assert_eq!(app.scenario_context().unwrap().visit, context.visit);
-    assert_reopens_exactly(&app);
-    let after = app.document.snapshot();
-    let revision = app.document.revision();
-    let duplicate = release(&mut mounted, &mut app, end).await;
-    assert!(!duplicate.iter().any(|message| matches!(
-        message,
-        Message::ScenarioCanvas(CanvasEvent::Spacing(spacing::Event::Finish { .. }))
-    )));
-    assert_eq!(app.document.revision(), revision);
-    assert!(Arc::ptr_eq(&after, &app.document.snapshot()));
-    let task = app.update(Message::Undo);
-    mounted.perform(&mut app, task).await;
-    assert_eq!(app.project(), &before.decoded.project);
-    assert_eq!(app.document.bundle(), &before.bundle);
-    assert!(!app.document.can_undo() && app.document.can_redo());
-    let task = app.update(Message::Redo);
-    mounted.perform(&mut app, task).await;
-    assert_eq!(app.project(), &after.decoded.project);
-    assert_eq!(app.document.bundle(), &after.bundle);
-}
-
-#[tokio::test]
-async fn saved_blank_left_drag_clears_selection_and_pans_on_that_same_press() {
-    use crate::diagram_usage::Target;
-    for group in [false, true] {
-        for same_batch in [false, true] {
-            let (mut app, mut mounted, _) = setup(false).await;
-            let first = id(&app, "initial_report");
-            let second = id(&app, "updated_report");
-            for target in [Some(first), group.then_some(second)].into_iter().flatten() {
-                let context = app.scenario_context().unwrap();
-                let snapshot = app.multiselect_snapshot().unwrap();
-                let task = app.update(selection::message(
-                    context,
-                    &snapshot,
-                    selection::Intent::Choose(
-                        Target::ScenarioObject(target),
-                        crate::app::multiselect::Choice::Add,
-                    ),
-                ));
-                mounted.perform(&mut app, task).await;
-            }
-            mounted.settle(&mut app).await;
-            assert_eq!(
-                app.multiselect_snapshot().unwrap().targets().len(),
-                if group { 2 } else { 1 }
-            );
-            let before = app.document.snapshot();
-            let context = app.scenario_context().unwrap();
-            let bounds = mounted.geometry(&app).bounds("scenario-viewport");
-            let start = bounds.position() + Vector::new(bounds.width - 25., bounds.height - 25.);
-            let delta = Vector::new(-25., -20.);
-            let end = start + delta;
-            let geometry = resolved(&app);
-            let camera = app.behavior.scenario.presentation.camera(geometry.bounds);
-            let world = Point::new(
-                (start.x - bounds.x - camera.pan.x) / camera.scale,
-                (start.y - bounds.y - camera.pan.y) / camera.scale,
-            );
-            assert!(
-                geometry.scene.hit_item(world).is_none(),
-                "test must start on actual blank geometry"
-            );
-            let stored = stored_camera(&app);
-            let messages = if same_batch {
-                mounted
-                    .batch(
-                        &mut app,
-                        &[
-                            mouse_event(mouse::Event::CursorMoved { position: start }),
-                            mouse_event(mouse::Event::ButtonPressed(mouse::Button::Left)),
-                            mouse_event(mouse::Event::CursorMoved { position: end }),
-                            mouse_event(mouse::Event::ButtonReleased(mouse::Button::Left)),
-                        ],
-                        mouse::Cursor::Available(end),
-                    )
-                    .await
-            } else {
-                let mut messages = press(&mut mounted, &mut app, start).await;
-                assert!(app.multiselect_snapshot().unwrap().targets().is_empty());
-                mounted.settle(&mut app).await;
-                messages.extend(move_to(&mut mounted, &mut app, end).await);
-                messages.extend(release(&mut mounted, &mut app, end).await);
-                messages
-            };
-            assert_eq!(messages.iter().filter(|message| matches!(message, Message::ScenarioCanvas(CanvasEvent::Selection(event)) if matches!(&event.intent, selection::Intent::Clear))).count(), 1);
-            assert!(app.multiselect_snapshot().unwrap().targets().is_empty());
-            let actual = stored_camera(&app);
-            let difference = actual.0 - (stored.0 + delta);
-            assert!(
-                difference.x.hypot(difference.y) < 0.01,
-                "same-press pan lost after Clear: group={group}, same_batch={same_batch}, {stored:?} -> {actual:?}"
-            );
-            assert_eq!(actual.1, stored.1);
-            assert_eq!(
-                app.scenario_context().unwrap().representation,
-                context.representation
-            );
-            assert_eq!(app.scenario_context().unwrap().visit, context.visit);
-            assert!(Arc::ptr_eq(&before, &app.document.snapshot()));
-            assert_eq!(app.document.bundle(), &before.bundle);
-            assert!(!app.document.can_undo() && !app.document.can_redo());
-        }
-    }
-}

crates/oa-desktop/src/behavior/scenario_lifecycle/render.rs

@@ -234,13 +234,6 @@ impl Rendering {
             .collect()
     }
 
-    /// Exact painted marker subjects and centers for shared selection adapters.
-    pub(in crate::behavior) fn selection_markers(&self) -> impl Iterator<Item = (Id, Point)> + '_ {
-        self.markers
-            .iter()
-            .map(|marker| (marker.event.occurrence, marker.center))
-    }
-
     pub(in crate::behavior) fn marker_at(&self, point: Point) -> Option<Id> {
         self.markers
             .iter()

crates/oa-desktop/src/behavior/state_canvas.rs

@@ -29,7 +29,6 @@ use std::{
 pub const GUIDANCE_HEIGHT: f32 = 42.;
 
 pub struct StateCanvas<'a> {
-    pub removal_input: &'a crate::removal_input::Lifetime,
     pub project: &'a Project,
     pub diagram: Id,
     pub context: Context,
@@ -45,8 +44,6 @@ pub struct StateCanvas<'a> {
 
 #[derive(Default)]
 pub struct State {
-    removal_lease: Option<crate::removal_input::Lease>,
-    removal_viewport: Option<(f32, Vector, Rectangle)>,
     context: Option<Context>,
     tool: Option<Tool>,
     pointer: Option<Point>,
@@ -880,21 +877,6 @@ impl StateCanvas<'_> {
             }
             if selection.targets().len() > 1 && *key == Key::Named(Named::Delete) {
                 let snapshot = selection.snapshot(selection_context(self.context))?;
-                if *modifiers == keyboard::Modifiers::SHIFT {
-                    let Some(input_generation) = self.removal_input.idle() else {
-                        return Some(Action::capture());
-                    };
-                    return Some(
-                        Action::publish(Event::ModelRemoval(Box::new(
-                            crate::app::saved_removal::Event::Begin {
-                                input_generation,
-                                context: self.context,
-                                snapshot: Box::new(snapshot),
-                            },
-                        )))
-                        .and_capture(),
-                    );
-                }
                 let event = if modifiers.is_empty()
                     && crate::app::multiselect::placements(&snapshot).is_some()
                 {
@@ -903,7 +885,7 @@ impl StateCanvas<'_> {
                     SelectionEvent::Refuse(snapshot, if modifiers.is_empty() {
                         "Hide requires only placed elements. Rows, ports and transitions cannot be hidden as a placement group."
                     } else {
-                        "Use Shift+Delete to review model deletion or Hide selected for placements."
+                        "Group model deletion requires an aggregate impact review and is not available yet. Use Hide selected for placements."
                     }.into())
                 };
                 return Some(Action::publish(Event::Selection(event)).and_capture());
@@ -1529,8 +1511,9 @@ fn kind_for_tool(tool: Tool) -> Kind {
     }
 }
 
-impl StateCanvas<'_> {
-    fn update_input(
+impl canvas::Program<Event> for StateCanvas<'_> {
+    type State = State;
+    fn update(
         &self,
         state: &mut State,
         event: &canvas::Event,
@@ -2019,51 +2002,6 @@ impl StateCanvas<'_> {
             _ => None,
         }
     }
-}
-impl canvas::Program<Event> for StateCanvas<'_> {
-    type State = State;
-    fn update(
-        &self,
-        state: &mut State,
-        event: &canvas::Event,
-        bounds: Rectangle,
-        cursor: mouse::Cursor,
-    ) -> Option<Action<Event>> {
-        self.removal_input.sync(
-            &mut state.removal_lease,
-            state.press.is_some()
-                || state.group.is_some()
-                || state.source.is_some()
-                || state.bend.is_some()
-                || state.pan_from.is_some(),
-        );
-        self.removal_input.observe(event);
-        let viewport = (self.zoom, self.pan, bounds);
-        if state
-            .removal_viewport
-            .is_some_and(|previous| previous != viewport)
-        {
-            self.removal_input.revoke_idle();
-        }
-        state.removal_viewport = Some(viewport);
-        let action = self.update_input(state, event, bounds, cursor);
-        if matches!(
-            event,
-            canvas::Event::Window(iced::window::Event::Unfocused | iced::window::Event::Resized(_))
-                | canvas::Event::Mouse(mouse::Event::CursorLeft)
-        ) {
-            state.reset();
-        }
-        self.removal_input.sync(
-            &mut state.removal_lease,
-            state.press.is_some()
-                || state.group.is_some()
-                || state.source.is_some()
-                || state.bend.is_some()
-                || state.pan_from.is_some(),
-        );
-        action
-    }
     fn draw(
         &self,
         state: &State,
@@ -2659,7 +2597,6 @@ mod tests {
     include!("state_multiselect_canvas_tests.rs");
 
     struct Fixture {
-        removal_input: crate::removal_input::Lifetime,
         project: Project,
         diagram: Id,
         machine: Id,
@@ -2721,7 +2658,6 @@ mod tests {
         }
         validate_candidate(&project).unwrap();
         Fixture {
-            removal_input: Default::default(),
             project,
             diagram,
             machine,
@@ -2922,7 +2858,6 @@ mod tests {
 
     fn canvas(f: &Fixture, tool: Tool, zoom: f32) -> StateCanvas<'_> {
         StateCanvas {
-            removal_input: &f.removal_input,
             project: &f.project,
             diagram: f.diagram,
             context: Context {

crates/oa-desktop/src/behavior/state_edit.rs

@@ -26,7 +26,6 @@ pub enum Tool {
 #[derive(Debug, Clone)]
 pub enum Event {
     Selection(crate::app::multiselect::Event),
-    ModelRemoval(Box<crate::app::saved_removal::Event>),
     Remove(crate::app::diagram_removal::Intent),
     Choose(Tool),
     CreateView(Id),
@@ -105,9 +104,7 @@ impl Event {
         match self {
             Self::Remove(intent) => Some(intent.context),
             // Group events carry their own exact selection envelope.
-            Self::Selection(_) | Self::ModelRemoval(_) | Self::Choose(_) | Self::CreateView(_) => {
-                None
-            }
+            Self::Selection(_) | Self::Choose(_) | Self::CreateView(_) => None,
             Self::Select(c, _)
             | Self::Pan(c, _)
             | Self::Zoom(c, _)

crates/oa-desktop/src/behavior/state_multiselect_canvas_tests.rs

@@ -328,10 +328,7 @@ fn state_group_delete_and_escape_respect_held_gesture_and_full_set() {
     let mut state = State::default();
     use keyboard::key::Named;
     assert!(matches!(group_key(&canvas, &mut state, Named::Delete, keyboard::Modifiers::empty()), Some(Event::Selection(SelectionEvent::Hide(_)))));
-    let Some(Event::ModelRemoval(removal)) = group_key(&canvas, &mut state, Named::Delete, keyboard::Modifiers::SHIFT) else {
-        panic!("Shift+Delete must capture the complete model-removal group");
-    };
-    assert!(matches!(*removal, crate::app::saved_removal::Event::Begin { snapshot, .. } if snapshot.targets() == selection.targets()));
+    assert!(matches!(group_key(&canvas, &mut state, Named::Delete, keyboard::Modifiers::SHIFT), Some(Event::Selection(SelectionEvent::Refuse(_, _)))));
     let at = screen(&canvas, header(&canvas, f.a));
     motion(&canvas, &mut state, at, at);
     input(&canvas, &mut state, mouse::Event::ButtonPressed(mouse::Button::Left), at);

crates/oa-desktop/src/behavior/state_view.rs

@@ -43,7 +43,6 @@ pub fn diagram(app: &App, machine: Id) -> Option<Id> {
 fn event(e: Event) -> Message {
     match e {
         Event::Selection(selection) => Message::DiagramSelection(selection),
-        Event::ModelRemoval(removal) => Message::SavedRemoval(removal),
         other => Message::StateDiagram(other),
     }
 }
@@ -170,7 +169,6 @@ pub fn view<'a>(app: &'a App, machine: Id, mut out: Column<'a, Message>) -> Elem
         );
     }
     let canvas: Element<'_, Event> = canvas::Canvas::new(super::state_canvas::StateCanvas {
-        removal_input: &app.saved_removal_input,
         project: p,
         diagram: id,
         context,
@@ -189,7 +187,7 @@ pub fn view<'a>(app: &'a App, machine: Id, mut out: Column<'a, Message>) -> Elem
     .into();
     out = out.push(
         column![
-            missing_controls,
+            container(missing_controls).id("state-missing-picker"),
             selection_controls(app),
             crate::diagram::focus::wrap(
                 canvas.map(event),
@@ -225,22 +223,15 @@ fn selection_controls(app: &App) -> Element<'_, Message> {
                 Message::DiagramSelection(SelectionEvent::Hide(snapshot.clone())),
             ));
         }
-        controls = controls.push(
-            button(text("Delete from model…").size(12))
-                .padding([6, 8])
-                .on_press_maybe(
-                    crate::app::saved_removal::begin(app).filter(|_| app.saved_removal_enabled()),
-                ),
-        );
         controls = controls
             .push(action(
-                "Clear",
+                "Clear selection",
                 Message::DiagramSelection(SelectionEvent::Clear(snapshot.context())),
             ))
             .push(
                 label(format!(
-                    "Edit only {}",
-                    crate::views::short(app.project().named(app.selected), 12)
+                    "Properties edit only {}",
+                    crate::views::short(app.project().named(app.selected), 18)
                 ))
                 .wrapping(iced::widget::text::Wrapping::None),
             );

crates/oa-desktop/src/behavior/topology.rs

@@ -5,9 +5,7 @@ use iced::widget::{Column, text_input};
 use std::collections::BTreeSet;
 pub(crate) mod contextual;
 mod direct;
-pub(crate) mod group_removal;
 pub(crate) mod group_reorder;
-use crate::removal_input;
 mod usages;
 mod view;
 #[cfg(test)]
@@ -82,7 +80,6 @@ impl std::fmt::Display for ControlChoice {
 }
 #[derive(Default)]
 pub struct State {
-    removal_input: removal_input::Lifetime,
     identity: Option<(Id, Id)>,
     tool: CanvasTool,
     expanded: BTreeSet<Id>,
@@ -131,10 +128,6 @@ struct Draft {
     contextual: Option<contextual::Draft>,
 }
 impl State {
-    pub(crate) fn removal_generation(&self) -> Option<u64> {
-        self.removal_input.idle()
-    }
-
     pub(crate) fn camera_boundary(&self) -> impl PartialEq + use<> {
         (
             self.tool,
@@ -1111,7 +1104,6 @@ const PAINT_PASSES: [PaintPass; 5] = [
 ];
 mod contextual_routing;
 struct Graph<'a> {
-    removal_input: removal_input::Lifetime,
     project: &'a Project,
     interaction: Option<(Context, CanvasTool, bool)>,
     camera_pan: iced::Vector,
@@ -1409,7 +1401,6 @@ impl<'a> Graph<'a> {
         }
         Self {
             project: p,
-            removal_input: removal_input::Lifetime::default(),
             interaction: None,
             camera_pan: iced::Vector::ZERO,
             pending_insertion: None,

crates/oa-desktop/src/behavior/topology/direct_selection.rs

@@ -6,7 +6,6 @@ use crate::diagram_selection::Snapshot;
 use crate::diagram_usage::Target;
 
 pub(super) struct GroupPress {
-    _removal_lease: super::super::removal_input::Lease,
     snapshot: Snapshot,
     target: Target,
     start: Point,
@@ -109,12 +108,6 @@ impl Graph<'_> {
         cursor: mouse::Cursor,
     ) -> Option<Action<Message>> {
         use iced::keyboard::{Event as KeyEvent, Key, key::Named};
-        if matches!(
-            event,
-            canvas::Event::Window(iced::window::Event::Unfocused | iced::window::Event::Resized(_))
-        ) {
-            self.removal_input.revoke_idle();
-        }
         match event {
             canvas::Event::Keyboard(KeyEvent::ModifiersChanged(modifiers))
             | canvas::Event::Keyboard(KeyEvent::KeyPressed { modifiers, .. })
@@ -212,46 +205,21 @@ impl Graph<'_> {
             return None;
         }
         let publish = |event| Some(Action::publish(Message::DiagramSelection(event)).and_capture());
-        if let canvas::Event::Keyboard(KeyEvent::KeyPressed {
-            key: Key::Named(Named::Delete),
-            modifiers,
-            repeat,
-            ..
-        }) = event
-            && (snapshot.targets().len() > 1
-                || snapshot.targets().iter().any(|t| match t {
-                    Target::ProcessPreviewLink { .. } => true,
-                    Target::ProcessOccurrence(endpoint) => !endpoint.references.is_empty(),
-                    _ => false,
-                }))
+        if matches!(
+            event,
+            canvas::Event::Keyboard(KeyEvent::KeyPressed {
+                key: Key::Named(Named::Delete),
+                repeat: false,
+                ..
+            })
+        ) && (snapshot.targets().len() > 1
+            || snapshot.targets().iter().any(|t| match t {
+                Target::ProcessPreviewLink { .. } => true,
+                Target::ProcessOccurrence(endpoint) => !endpoint.references.is_empty(),
+                _ => false,
+            }))
         {
-            if *repeat
-                || tool != CanvasTool::Select
-                || !(modifiers.is_empty() || *modifiers == iced::keyboard::Modifiers::SHIFT)
-                || state.press.is_some()
-                || state.source.is_some()
-            {
-                return Some(Action::capture());
-            }
-            if snapshot.targets().len() > 1 {
-                let Some(input_generation) = self.removal_input.idle() else {
-                    return Some(Action::capture());
-                };
-                return Some(
-                    Action::publish(Message::ProcessRemoval(Box::new(
-                        crate::app::process_removal::Event::Begin {
-                            input_generation,
-                            context,
-                            snapshot: Box::new(snapshot.clone()),
-                        },
-                    )))
-                    .and_capture(),
-                );
-            }
-            return publish(SelectionEvent::Refuse(
-                snapshot.clone(),
-                "Open the referenced definition to remove qualified contributions.".into(),
-            ));
+            return publish(SelectionEvent::Refuse(snapshot.clone(), "Remove is unavailable for this selection. Open the referenced definition to edit qualified contributions; group removal needs an aggregate review.".into()));
         }
         let pointer = match event {
             canvas::Event::Mouse(mouse::Event::CursorMoved { position }) => Some(*position),
@@ -260,9 +228,6 @@ impl Graph<'_> {
         if !bounds.contains(pointer) {
             return None;
         }
-        if matches!(event, canvas::Event::Mouse(mouse::Event::ButtonPressed(_))) {
-            self.removal_input.revoke_idle();
-        }
         let world = Point::new(
             (pointer.x - bounds.x - self.camera_pan.x) / self.scale,
             (pointer.y - bounds.y - self.camera_pan.y) / self.scale,
@@ -345,11 +310,7 @@ impl Graph<'_> {
         state.tool = tool;
         state.bounds = Some(bounds);
         state.pointer = Some(pointer);
-        let Some(lease) = self.removal_input.acquire() else {
-            return Some(Action::capture());
-        };
         state.group = Some(GroupPress {
-            _removal_lease: lease,
             snapshot: snapshot.clone(),
             target,
             start: pointer,

crates/oa-desktop/src/behavior/topology/direct_selection_tests.rs

@@ -171,7 +171,7 @@ fn selected_anchor_noop_and_irreversible_threshold_never_collapse_after_motion()
 }
 
 #[test]
-fn whole_mixed_set_reviews_delete_and_refuses_drag_and_connect_without_singleton_bypass() {
+fn whole_mixed_set_refuses_drag_delete_and_connect_without_singleton_bypass() {
     let f = fixture(Layer::Sa);
     let mut graph = graph(&f, &[local(f.nodes[0]), Target::ProcessLink(f.link)]);
     graph.selected = f.link;
@@ -187,7 +187,7 @@ fn whole_mixed_set_reviews_delete_and_refuses_drag_and_connect_without_singleton
     };
     assert!(matches!(
         send(&graph, &mut input, canvas::Event::Keyboard(key), start),
-        Some(Message::ProcessRemoval(event)) if matches!(&*event, crate::app::process_removal::Event::Begin { snapshot, .. } if snapshot.targets().len() == 2)
+        Some(Message::DiagramSelection(SelectionEvent::Refuse(_, _)))
     ));
     graph.interaction.as_mut().unwrap().1 = CanvasTool::Connect;
     assert!(matches!(
@@ -401,99 +401,3 @@ fn mixed_group_at_endpoint_card_refuses_whole_drag_without_hidden_singleton_hand
         }
     }
 }
-
-#[test]
-fn group_delete_modifiers_repeat_and_active_gesture_never_emit_singleton_or_confirmation() {
-    use iced::keyboard::{Event as KeyEvent, Modifiers, key::Named};
-    let f = fixture(Layer::Oa);
-    let graph = graph(&f, &[local(f.nodes[0]), Target::ProcessLink(f.link)]);
-    let start = point(&graph, f.nodes[0], false);
-    for modifiers in [
-        Modifiers::empty(),
-        Modifiers::SHIFT,
-        Modifiers::CTRL,
-        Modifiers::ALT,
-    ] {
-        for repeat in [false, true] {
-            let iced::Event::Keyboard(mut key) =
-                crate::behavior::canvas_workspace::tests::key(Named::Delete)
-            else {
-                panic!("key")
-            };
-            if let KeyEvent::KeyPressed {
-                modifiers: value,
-                repeat: value_repeat,
-                ..
-            } = &mut key
-            {
-                *value = modifiers;
-                *value_repeat = repeat;
-            }
-            let message = send(
-                &graph,
-                &mut Input::default(),
-                canvas::Event::Keyboard(key),
-                start,
-            );
-            if !repeat && (modifiers.is_empty() || modifiers == Modifiers::SHIFT) {
-                assert!(
-                    matches!(message, Some(Message::ProcessRemoval(event)) if matches!(&*event, crate::app::process_removal::Event::Begin { snapshot, .. } if Some(&**snapshot) == graph.selection.as_ref()))
-                );
-            } else {
-                assert!(message.is_none());
-            }
-        }
-    }
-    let mut input = Input::default();
-    press(&graph, &mut input, start);
-    let iced::Event::Keyboard(key) = crate::behavior::canvas_workspace::tests::key(Named::Delete)
-    else {
-        panic!("key")
-    };
-    assert!(send(&graph, &mut input, canvas::Event::Keyboard(key), start).is_none());
-    assert!(input.group.is_some());
-}
-
-#[test]
-fn process_removal_gesture_lease_retires_on_release_cancel_and_widget_state_drop() {
-    let f = fixture(Layer::Oa);
-    for end in ["release", "escape", "drop", "unfocus"] {
-        let graph = graph(&f, &[local(f.nodes[0]), Target::ProcessLink(f.link)]);
-        let before = graph.removal_input.idle().unwrap();
-        let at = point(&graph, f.nodes[0], false);
-        let mut input = Input::default();
-        assert!(press(&graph, &mut input, at).is_none());
-        assert!(input.group.is_some());
-        assert!(graph.removal_input.idle().is_none());
-        match end {
-            "release" => {
-                release(&graph, &mut input, at);
-            }
-            "escape" => {
-                let iced::Event::Keyboard(key) = crate::behavior::canvas_workspace::tests::key(
-                    iced::keyboard::key::Named::Escape,
-                ) else {
-                    panic!("key")
-                };
-                send(&graph, &mut input, canvas::Event::Keyboard(key), at);
-            }
-            "unfocus" => {
-                send(
-                    &graph,
-                    &mut input,
-                    canvas::Event::Window(iced::window::Event::Unfocused),
-                    at,
-                );
-            }
-            _ => {
-                drop(input);
-            }
-        }
-        assert!(graph.removal_input.idle().is_some());
-        assert_ne!(
-            graph.removal_input.idle(),
-            Some(before),
-            "{end} cannot restore an old Begin generation"
-        );
-    }
-}

crates/oa-desktop/src/behavior/topology/group_removal.rs

@@ -1,148 +0,0 @@
-//! Exact local Process/FunctionalChain removal and definition-level interpretation
-//! effects. Visibility, source drafts and captured UI lifetime belong to the App.
-use super::*;
-use crate::diagram_usage::Target;
-#[cfg(test)]
-use crate::removal_effects::Interpretation;
-pub(crate) use crate::removal_effects::InterpretationChange;
-
-#[derive(Debug)]
-pub(crate) struct Plan {
-    pub(crate) command: Command,
-    pub(crate) removed: BTreeSet<Id>,
-    pub(crate) changed: BTreeSet<Id>,
-    pub(crate) interpretation: Vec<InterpretationChange>,
-    /// Definitions whose authored topology changed, including changes that do
-    /// not switch interpretation. Values are surviving transitive callers.
-    pub(crate) affected_uses: BTreeMap<Id, BTreeSet<Id>>,
-}
-
-fn changed_records<T: PartialEq>(
-    before: &BTreeMap<Id, T>,
-    after: &BTreeMap<Id, T>,
-    changed: &mut BTreeSet<Id>,
-) {
-    changed.extend(
-        before
-            .iter()
-            .filter_map(|(&id, record)| after.get(&id).filter(|next| *next != record).map(|_| id)),
-    );
-}
-
-pub(crate) fn prepare(project: &Project, owner: Id, targets: &[Target]) -> Result<Plan, String> {
-    let element = project
-        .elements
-        .get(&owner)
-        .filter(|e| matches!(e.kind(), Kind::Process | Kind::FunctionalChain))
-        .ok_or("Choose an existing Process or Functional Chain.")?;
-    if targets.is_empty() {
-        return Err("Select at least one local contribution or maintained link to remove.".into());
-    }
-    oa_core::session::validate_candidate(project).map_err(|error| error.to_string())?;
-    let mut listed = BTreeSet::new();
-    for &id in element
-        .steps()
-        .ok_or("This owner has no contribution order.")?
-    {
-        if !is_contribution(project, owner, id)
-            || project.elements[&id].layer() != element.layer()
-            || !listed.insert(id)
-        {
-            return Err(
-                "Every process step must name a unique local contribution before removal.".into(),
-            );
-        }
-    }
-    let mut selected = BTreeSet::new();
-    let mut occurrences = BTreeSet::new();
-    let mut links = BTreeSet::new();
-    // Admit ALL original typed targets before any dependency normalization.
-    for target in targets {
-        let id = match target {
-            Target::ProcessOccurrence(endpoint) => {
-                if !endpoint.references.is_empty() {
-                    return Err("Open the referenced definition to remove its contents.".into());
-                }
-                if !listed.contains(&endpoint.occurrence) {
-                    return Err("Every selected contribution must be listed directly in this process.".into());
-                }
-                occurrences.insert(endpoint.occurrence);
-                endpoint.occurrence
-            }
-            Target::ProcessLink(id) => {
-                let relation = project.relations.get(id).ok_or("A selected maintained link no longer exists.")?;
-                let local = match &relation.body {
-                    RelationBody::SequenceLink { source, target, .. } => listed.contains(source) && listed.contains(target),
-                    RelationBody::ContextualLink { owner: actual, .. } => *actual == owner,
-                    _ => false,
-                };
-                if !local {
-                    return Err("Every selected link must be maintained locally by this process, with listed local endpoints for sequence links.".into());
-                }
-                links.insert(*id);
-                *id
-            }
-            _ => return Err("Remove only local process contributions and maintained links together; referenced preview links are read-only here.".into()),
-        };
-        if !selected.insert(id) {
-            return Err("Every selected process subject must be unique.".into());
-        }
-    }
-    // Contribution kinds cannot contain one another; only admitted links can be
-    // covered by an occurrence cascade. Ancestry alone misses incident links.
-    let covered: BTreeSet<_> = occurrences
-        .iter()
-        .flat_map(|id| oa_core::references::deletion_impact(project, *id))
-        .collect();
-    let command = Command::Batch(
-        occurrences
-            .into_iter()
-            .chain(links.into_iter().filter(|id| !covered.contains(id)))
-            .map(Command::Delete)
-            .collect(),
-    );
-    let candidate = execute_batch(project, std::slice::from_ref(&command))
-        .map_err(|error| error.to_string())?;
-    let original: BTreeSet<_> = project.identities().into_iter().map(|(id, _)| id).collect();
-    let retained: BTreeSet<_> = candidate
-        .identities()
-        .into_iter()
-        .map(|(id, _)| id)
-        .collect();
-    if !retained.is_subset(&original) {
-        return Err("Removal unexpectedly created model identities; no change was applied.".into());
-    }
-    let removed: BTreeSet<_> = original.difference(&retained).copied().collect();
-    if !selected.is_subset(&removed) {
-        return Err("The complete selected set could not be removed.".into());
-    }
-    let mut changed = BTreeSet::new();
-    changed_records(&project.elements, &candidate.elements, &mut changed);
-    changed_records(&project.relations, &candidate.relations, &mut changed);
-    changed_records(&project.diagrams, &candidate.diagrams, &mut changed);
-    changed_records(
-        &project.artifact_links,
-        &candidate.artifact_links,
-        &mut changed,
-    );
-    changed_records(&project.traces, &candidate.traces, &mut changed);
-    for (&id, diagram) in &project.diagrams {
-        if let Some(after) = candidate.diagrams.get(&id) {
-            changed_records(&diagram.nodes, &after.nodes, &mut changed);
-        }
-    }
-    let crate::removal_effects::DerivedEffects {
-        interpretation,
-        affected_uses,
-    } = crate::removal_effects::analyze(project, &candidate, &removed, &changed);
-    Ok(Plan {
-        command,
-        removed,
-        changed,
-        interpretation,
-        affected_uses,
-    })
-}
-
-#[cfg(test)]
-mod tests;

crates/oa-desktop/src/behavior/topology/group_removal/tests.rs

@@ -1,909 +0,0 @@
-use super::*;
-use crate::document::Document;
-use oa_core::{MessageKind, source_project::ProjectLimits};
-
-fn endpoint(id: Id) -> OccurrenceEndpoint {
-    OccurrenceEndpoint {
-        references: vec![],
-        occurrence: id,
-    }
-}
-
-fn local(id: Id) -> Target {
-    Target::ProcessOccurrence(endpoint(id))
-}
-
-fn add(project: &mut Project, owner: Id, name: &str, body: OccurrenceBody) -> Id {
-    let element = occurrence(project, owner, name, body);
-    let id = element.id;
-    project.elements.insert(id, element);
-    project
-        .elements
-        .get_mut(&owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .push(id);
-    id
-}
-
-fn action(project: &mut Project, owner: Id, name: &str, work: Id) -> Id {
-    add(
-        project,
-        owner,
-        name,
-        OccurrenceBody::Action {
-            action: Some(work),
-            lifeline: None,
-        },
-    )
-}
-
-fn exchange_step(project: &mut Project, owner: Id, name: &str, exchange: Id) -> Id {
-    add(
-        project,
-        owner,
-        name,
-        OccurrenceBody::Exchange {
-            exchange: Some(exchange),
-            sender: None,
-            receiver: None,
-            message_kind: MessageKind::Asynchronous,
-            reply_to: None,
-            values: vec![],
-            operation: None,
-        },
-    )
-}
-
-fn sequence(project: &mut Project, layer: Layer, name: &str) -> Id {
-    project
-        .add_element(
-            if layer == Layer::Oa {
-                Kind::Process
-            } else {
-                Kind::FunctionalChain
-            },
-            layer,
-            name,
-            None,
-        )
-        .unwrap()
-}
-
-fn reuse(project: &mut Project, owner: Id, name: &str, definition: Id) -> Id {
-    add(
-        project,
-        owner,
-        name,
-        OccurrenceBody::SequenceReference {
-            sequence: Some(definition),
-        },
-    )
-}
-
-fn maintained(project: &mut Project, source: Id, target: Id) -> Id {
-    let Command::CreateRelation(relation) = link(project, source, target, "authored guard") else {
-        panic!()
-    };
-    let id = relation.id;
-    project.relations.insert(id, relation);
-    id
-}
-
-fn contextual(
-    project: &mut Project,
-    owner: Id,
-    source: OccurrenceEndpoint,
-    target: OccurrenceEndpoint,
-    purpose: ContextualLinkPurpose,
-) -> Id {
-    let Command::CreateRelation(mut relation) =
-        link(project, source.occurrence, target.occurrence, "")
-    else {
-        panic!()
-    };
-    let id = relation.id;
-    relation.body = RelationBody::ContextualLink {
-        owner,
-        source,
-        target,
-        purpose,
-    };
-    project.relations.insert(id, relation);
-    id
-}
-
-fn precedence() -> ContextualLinkPurpose {
-    ContextualLinkPurpose::Precedence {
-        guard: "caller guard".into(),
-    }
-}
-
-fn qualified(references: &[Id], occurrence: Id) -> OccurrenceEndpoint {
-    OccurrenceEndpoint {
-        references: references.to_vec(),
-        occurrence,
-    }
-}
-
-fn interpretation(
-    local: Option<Vec<Id>>,
-    expanded: Option<Vec<Id>>,
-    contextual: bool,
-) -> Interpretation {
-    Interpretation {
-        local_order: local,
-        expanded_order: expanded,
-        contextual_analysis: contextual,
-    }
-}
-
-fn expected_without(project: &Project, owner: Id, elements: &[Id], relations: &[Id]) -> Project {
-    let mut expected = project.clone();
-    for id in elements {
-        expected.elements.remove(id);
-    }
-    for id in relations {
-        expected.relations.remove(id);
-    }
-    expected
-        .elements
-        .get_mut(&owner)
-        .unwrap()
-        .steps_mut()
-        .unwrap()
-        .retain(|id| !elements.contains(id));
-    expected
-}
-
-fn assert_history(project: &Project, expected: &Project, command: Command) {
-    let mut doc = Document::from_project(project.clone(), ProjectLimits::default()).unwrap();
-    let original = doc.bundle().clone();
-    doc.execute(command).unwrap();
-    assert_eq!(doc.project(), expected);
-    let after = doc.bundle().clone();
-    let reopened = Document::from_bundle(after.clone(), ProjectLimits::default()).unwrap();
-    assert_eq!(reopened.project(), expected);
-    assert!(doc.undo());
-    assert_eq!(doc.project(), project);
-    assert_eq!(doc.bundle(), &original);
-    assert!(!doc.can_undo());
-    assert!(doc.redo());
-    assert_eq!(doc.project(), expected);
-    assert_eq!(doc.bundle(), &after);
-    assert!(!doc.can_redo());
-}
-
-#[test]
-fn process_group_removal_mixed_cards_preserve_sources_definitions_and_other_uses() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let (f, _) = super::super::direct_tests::empty_exchange_fixture(layer);
-        let mut p = f.p;
-        let definition = sequence(&mut p, layer, "Reusable");
-        let leaf = action(&mut p, definition, "Leaf", f.work[0]);
-        let a = action(&mut p, f.owner, "Action", f.work[0]);
-        let e = exchange_step(&mut p, f.owner, "Exchange", f.exchange);
-        let c = add(
-            &mut p,
-            f.owner,
-            "Control",
-            OccurrenceBody::Control {
-                kind: ControlKind::Choice,
-            },
-        );
-        let r = reuse(&mut p, f.owner, "First use", definition);
-        let r2 = reuse(&mut p, f.owner, "Preserved use", definition);
-        let plan = prepare(&p, f.owner, &[local(r), local(c), local(e), local(a)]).unwrap();
-        assert_eq!(plan.removed, BTreeSet::from([a, e, c, r]));
-        assert_eq!(plan.changed, BTreeSet::from([f.owner]));
-        assert!(plan.interpretation.is_empty());
-        let expected = expected_without(&p, f.owner, &[a, e, c, r], &[]);
-        assert_eq!(expected.elements[&f.owner].steps().unwrap(), &[r2]);
-        assert!(expected.contains(leaf));
-        assert_history(&p, &expected, plan.command);
-    }
-}
-
-#[test]
-fn process_group_removal_dependent_selected_links_are_normalized_after_whole_set_admission() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let f = super::super::direct_tests::fixture(layer);
-        let mut p = f.p;
-        let [a, b, c] = f.nodes;
-        let parallel = maintained(&mut p, a, b);
-        let adjacent = maintained(&mut p, b, c);
-        let context = contextual(
-            &mut p,
-            f.owner,
-            endpoint(a),
-            endpoint(b),
-            ContextualLinkPurpose::Exchange {
-                exchange: f.exchange,
-            },
-        );
-        let targets = vec![
-            Target::ProcessLink(f.link),
-            local(a),
-            Target::ProcessLink(parallel),
-            local(b),
-            Target::ProcessLink(context),
-        ];
-        let first = prepare(&p, f.owner, &targets).unwrap();
-        let mut reverse = targets.clone();
-        reverse.reverse();
-        let second = prepare(&p, f.owner, &reverse).unwrap();
-        assert_eq!(first.command, second.command);
-        assert_eq!(
-            first.removed,
-            BTreeSet::from([a, b, f.link, parallel, adjacent, context])
-        );
-        assert_eq!(first.changed, BTreeSet::from([f.owner]));
-        assert_eq!(
-            first.interpretation,
-            vec![InterpretationChange {
-                owner: f.owner,
-                before: interpretation(None, None, true),
-                after: interpretation(None, None, false),
-                callers: BTreeSet::new(),
-            }]
-        );
-        let Command::Batch(commands) = &first.command else {
-            panic!()
-        };
-        assert_eq!(
-            commands.len(),
-            2,
-            "All selected links are covered by admitted card roots"
-        );
-        let expected =
-            expected_without(&p, f.owner, &[a, b], &[f.link, parallel, adjacent, context]);
-        assert_history(&p, &expected, first.command);
-    }
-}
-
-#[test]
-fn process_group_removal_refuses_every_invalid_original_typed_member() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let f = super::super::direct_tests::fixture(layer);
-        let mut p = f.p;
-        let other = sequence(&mut p, layer, "Other");
-        let foreign = action(&mut p, other, "Foreign", f.work[0]);
-        let foreign_other = action(&mut p, other, "Other foreign", f.work[0]);
-        let unlisted = action(&mut p, f.owner, "Owned but unlisted", f.work[0]);
-        p.elements
-            .get_mut(&f.owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap()
-            .retain(|id| *id != unlisted);
-        let unlisted_link = maintained(&mut p, unlisted, f.nodes[0]);
-        let foreign_context = contextual(
-            &mut p,
-            other,
-            endpoint(foreign),
-            endpoint(foreign_other),
-            ContextualLinkPurpose::CommonWork { work: f.work[0] },
-        );
-        // Use two separate qualified paths with the same leaf: neither can be
-        // silently reduced to that leaf or to an outer reference occurrence.
-        let r1 = reuse(&mut p, f.owner, "Use one", other);
-        let r2 = reuse(&mut p, f.owner, "Use two", other);
-        let missing = Id::new_v4();
-        let bad = vec![
-            Target::Whole,
-            Target::Placement(f.nodes[0]),
-            Target::Port {
-                port: f.work[0],
-                placement: f.nodes[0],
-            },
-            Target::Edge(f.link),
-            Target::StateRow {
-                placement: f.nodes[0],
-                relation: f.link,
-            },
-            Target::AllocationGrouping {
-                relation: f.link,
-                work_placement: f.nodes[0],
-                performer_placement: f.nodes[1],
-            },
-            Target::ScenarioObject(f.nodes[0]),
-            Target::ProcessPreviewLink {
-                relation: f.link,
-                source: endpoint(f.nodes[0]),
-                target: endpoint(f.nodes[1]),
-            },
-            Target::ProcessOccurrence(qualified(&[r1], foreign)),
-            Target::ProcessOccurrence(qualified(&[r2], foreign)),
-            local(foreign),
-            local(unlisted),
-            local(missing),
-            local(f.work[0]),
-            Target::ProcessLink(unlisted_link),
-            Target::ProcessLink(foreign_context),
-            Target::ProcessLink(f.exchange),
-            Target::ProcessLink(missing),
-            Target::ProcessLink(f.nodes[0]),
-        ];
-        oa_core::session::validate_candidate(&p).unwrap();
-        let source = oa_core::language::format(&p);
-        for target in bad {
-            assert!(
-                prepare(&p, f.owner, &[local(f.nodes[0]), target.clone()]).is_err(),
-                "{target:?}"
-            );
-            assert!(prepare(&p, f.owner, &[target, local(f.nodes[0])]).is_err());
-        }
-        assert!(prepare(&p, f.owner, &[]).is_err());
-        assert!(prepare(&p, f.owner, &[local(f.nodes[0]), local(f.nodes[0])]).is_err());
-        assert!(
-            prepare(
-                &p,
-                f.owner,
-                &[Target::ProcessLink(f.link), Target::ProcessLink(f.link)]
-            )
-            .is_err()
-        );
-        assert!(prepare(&p, f.work[0], &[local(f.nodes[0])]).is_err());
-        assert!(prepare(&p, missing, &[local(f.nodes[0])]).is_err());
-        assert_eq!(oa_core::language::format(&p), source);
-        let mut duplicate_steps = p.clone();
-        duplicate_steps
-            .elements
-            .get_mut(&f.owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap()
-            .push(f.nodes[0]);
-        assert!(prepare(&duplicate_steps, f.owner, &[local(f.nodes[1])]).is_err());
-        let mut wrong_parent = p.clone();
-        wrong_parent.elements.get_mut(&f.nodes[0]).unwrap().parent = Some(other);
-        assert!(prepare(&wrong_parent, f.owner, &[local(f.nodes[1])]).is_err());
-        let mut missing_step = p.clone();
-        missing_step
-            .elements
-            .get_mut(&f.owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap()
-            .push(missing);
-        assert!(prepare(&missing_step, f.owner, &[local(f.nodes[1])]).is_err());
-    }
-}
-
-#[test]
-fn process_group_removal_last_markers_and_legacy_interior_report_literal_orders() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let (f, _) = super::super::direct_tests::empty_exchange_fixture(layer);
-        let mut p = f.p;
-        let a = action(&mut p, f.owner, "Marker", f.work[0]);
-        let e1 = exchange_step(&mut p, f.owner, "First", f.exchange);
-        let c = add(
-            &mut p,
-            f.owner,
-            "Control",
-            OccurrenceBody::Control {
-                kind: ControlKind::Choice,
-            },
-        );
-        let e2 = exchange_step(&mut p, f.owner, "Middle", f.exchange);
-        let e3 = exchange_step(&mut p, f.owner, "Last", f.exchange);
-        let caller = sequence(&mut p, layer, "Caller");
-        reuse(&mut p, caller, "Reference", f.owner);
-        let outer = sequence(&mut p, layer, "Outer");
-        reuse(&mut p, outer, "Transitive reference", caller);
-        let plan = prepare(&p, f.owner, &[local(c), local(a)]).unwrap();
-        assert_eq!(
-            plan.interpretation,
-            vec![InterpretationChange {
-                owner: f.owner,
-                before: interpretation(None, None, false),
-                after: interpretation(Some(vec![e1, e2, e3]), Some(vec![e1, e2, e3]), false),
-                callers: BTreeSet::from([caller, outer]),
-            }]
-        );
-        let expected = expected_without(&p, f.owner, &[a, c], &[]);
-        assert_history(&p, &expected, plan.command);
-        let bridge = prepare(&expected, f.owner, &[local(e2)]).unwrap();
-        assert_eq!(
-            bridge.interpretation,
-            vec![InterpretationChange {
-                owner: f.owner,
-                before: interpretation(Some(vec![e1, e2, e3]), Some(vec![e1, e2, e3]), false),
-                after: interpretation(Some(vec![e1, e3]), Some(vec![e1, e3]), false),
-                callers: BTreeSet::from([caller, outer]),
-            }]
-        );
-        assert_eq!(bridge.removed, BTreeSet::from([e2]));
-        assert_history(
-            &expected,
-            &expected_without(&expected, f.owner, &[e2], &[]),
-            bridge.command,
-        );
-    }
-}
-
-#[test]
-fn process_group_removal_last_link_and_zero_or_one_exchange_have_no_invented_objects() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let (f, next) = super::super::direct_tests::empty_exchange_fixture(layer);
-        let mut p = f.p;
-        let e1 = exchange_step(&mut p, f.owner, "First", f.exchange);
-        let e2 = exchange_step(&mut p, f.owner, "Second", next);
-        let link = maintained(&mut p, e1, e2);
-        let plan = prepare(&p, f.owner, &[Target::ProcessLink(link)]).unwrap();
-        assert_eq!(plan.removed, BTreeSet::from([link]));
-        assert!(plan.changed.is_empty());
-        assert_eq!(
-            plan.interpretation,
-            vec![InterpretationChange {
-                owner: f.owner,
-                before: interpretation(None, None, false),
-                after: interpretation(Some(vec![e1, e2]), Some(vec![e1, e2]), false),
-                callers: BTreeSet::new(),
-            }]
-        );
-        assert_history(
-            &p,
-            &expected_without(&p, f.owner, &[], &[link]),
-            plan.command,
-        );
-        for remaining in [vec![], vec![e1]] {
-            let mut model = expected_without(&p, f.owner, &[e2], &[link]);
-            if remaining.is_empty() {
-                model = expected_without(&model, f.owner, &[e1], &[]);
-            }
-            let marker = action(&mut model, f.owner, "Marker", f.work[0]);
-            let plan = prepare(&model, f.owner, &[local(marker)]).unwrap();
-            assert_eq!(
-                plan.interpretation,
-                vec![InterpretationChange {
-                    owner: f.owner,
-                    before: interpretation(None, None, false),
-                    after: interpretation(Some(remaining.clone()), Some(remaining), false),
-                    callers: BTreeSet::new(),
-                }]
-            );
-            assert_history(
-                &model,
-                &expected_without(&model, f.owner, &[marker], &[]),
-                plan.command,
-            );
-        }
-    }
-}
-
-#[test]
-fn process_group_removal_global_contextual_dependencies_and_caller_modes_are_separate_from_record_deltas()
- {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let f = super::super::direct_tests::fixture(layer);
-        let mut p = f.p;
-        let caller = sequence(&mut p, layer, "Caller");
-        let r1 = reuse(&mut p, caller, "Use one", f.owner);
-        let r2 = reuse(&mut p, caller, "Use two", f.owner);
-        let outer = sequence(&mut p, layer, "Outer");
-        let outer_use = reuse(&mut p, outer, "Outer use", caller);
-        let caller_link = contextual(
-            &mut p,
-            caller,
-            qualified(&[r1], f.nodes[0]),
-            qualified(&[r2], f.nodes[1]),
-            precedence(),
-        );
-        let outer_link = contextual(
-            &mut p,
-            outer,
-            qualified(&[outer_use, r1], f.nodes[0]),
-            qualified(&[outer_use, r2], f.nodes[1]),
-            precedence(),
-        );
-        let top = sequence(&mut p, layer, "Top");
-        reuse(&mut p, top, "Top use", outer);
-        let plan = prepare(&p, f.owner, &[local(f.nodes[0])]).unwrap();
-        assert_eq!(
-            plan.removed,
-            BTreeSet::from([f.nodes[0], f.link, caller_link, outer_link])
-        );
-        assert_eq!(plan.changed, BTreeSet::from([f.owner]));
-        let by_owner: BTreeMap<_, _> = plan
-            .interpretation
-            .iter()
-            .map(|change| (change.owner, change))
-            .collect();
-        assert_eq!(
-            by_owner.keys().copied().collect::<BTreeSet<_>>(),
-            BTreeSet::from([caller, outer, top])
-        );
-        for id in [caller, outer, top] {
-            assert_eq!(by_owner[&id].before, interpretation(None, None, true));
-            assert_eq!(by_owner[&id].after, interpretation(None, None, false));
-        }
-        assert_eq!(by_owner[&caller].callers, BTreeSet::from([outer, top]));
-        assert_eq!(by_owner[&outer].callers, BTreeSet::from([top]));
-        assert!(by_owner[&top].callers.is_empty());
-        assert_eq!(
-            plan.affected_uses,
-            BTreeMap::from([
-                (f.owner, BTreeSet::from([caller, outer, top])),
-                (caller, BTreeSet::from([outer, top])),
-                (outer, BTreeSet::from([top])),
-            ])
-        );
-        let expected = expected_without(
-            &p,
-            f.owner,
-            &[f.nodes[0]],
-            &[f.link, caller_link, outer_link],
-        );
-        assert_history(&p, &expected, plan.command);
-        // Removing an outer reuse removes only that use and paths through it.
-        let outer_plan =
-            prepare(&p, caller, &[local(r1), Target::ProcessLink(caller_link)]).unwrap();
-        assert_eq!(
-            outer_plan.removed,
-            BTreeSet::from([r1, caller_link, outer_link])
-        );
-        let expected = expected_without(&p, caller, &[r1], &[caller_link, outer_link]);
-        assert_history(&p, &expected, outer_plan.command);
-    }
-}
-
-#[test]
-fn process_group_removal_qualified_local_relations_preserve_every_purpose_source() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        for purpose_kind in 0..3 {
-            let f = super::super::direct_tests::fixture(layer);
-            let mut p = f.p;
-            let owner = sequence(&mut p, layer, "Assembly");
-            let r1 = reuse(&mut p, owner, "First", f.owner);
-            let r2 = reuse(&mut p, owner, "Second", f.owner);
-            let (target, purpose) = match purpose_kind {
-                0 => (f.nodes[1], precedence()),
-                1 => (
-                    f.nodes[1],
-                    ContextualLinkPurpose::Exchange {
-                        exchange: f.exchange,
-                    },
-                ),
-                _ => (
-                    f.nodes[0],
-                    ContextualLinkPurpose::CommonWork { work: f.work[0] },
-                ),
-            };
-            let relation = contextual(
-                &mut p,
-                owner,
-                qualified(&[r1], f.nodes[0]),
-                qualified(&[r2], target),
-                purpose,
-            );
-            let plan = prepare(&p, owner, &[Target::ProcessLink(relation)]).unwrap();
-            assert_eq!(plan.removed, BTreeSet::from([relation]));
-            assert!(plan.changed.is_empty());
-            assert_eq!(
-                plan.interpretation,
-                vec![InterpretationChange {
-                    owner,
-                    before: interpretation(None, None, true),
-                    after: interpretation(None, None, false),
-                    callers: BTreeSet::new(),
-                }]
-            );
-            assert_history(
-                &p,
-                &expected_without(&p, owner, &[], &[relation]),
-                plan.command,
-            );
-        }
-    }
-}
-
-#[test]
-fn process_group_removal_predicate_discriminators_include_contextual_only_and_unlisted_contributions()
- {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let (f, _) = super::super::direct_tests::empty_exchange_fixture(layer);
-        let mut p = f.p;
-        let e1 = exchange_step(&mut p, f.owner, "First", f.exchange);
-        let e2 = exchange_step(&mut p, f.owner, "Second", f.exchange);
-        // Core-valid incomplete source: desktop lists only exchanges, while the
-        // index includes two unlisted actions and their CommonWork relation.
-        let a1 = action(&mut p, f.owner, "Unlisted one", f.work[0]);
-        let a2 = action(&mut p, f.owner, "Unlisted two", f.work[0]);
-        p.elements
-            .get_mut(&f.owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap()
-            .retain(|id| *id != a1 && *id != a2);
-        let relation = contextual(
-            &mut p,
-            f.owner,
-            endpoint(a1),
-            endpoint(a2),
-            ContextualLinkPurpose::CommonWork { work: f.work[0] },
-        );
-        let plan = prepare(&p, f.owner, &[Target::ProcessLink(relation)]).unwrap();
-        assert_eq!(
-            plan.interpretation,
-            vec![InterpretationChange {
-                owner: f.owner,
-                before: interpretation(Some(vec![e1, e2]), None, true),
-                after: interpretation(Some(vec![e1, e2]), None, false),
-                callers: BTreeSet::new(),
-            }]
-        );
-        let mut p = expected_without(&p, f.owner, &[a1, a2], &[relation]);
-        let unlisted = action(&mut p, f.owner, "Unlisted marker", f.work[0]);
-        p.elements
-            .get_mut(&f.owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap()
-            .retain(|id| *id != unlisted);
-        let plan = prepare(&p, f.owner, &[local(e1)]).unwrap();
-        assert_eq!(
-            plan.interpretation,
-            vec![InterpretationChange {
-                owner: f.owner,
-                before: interpretation(Some(vec![e1, e2]), None, false),
-                after: interpretation(Some(vec![e2]), None, false),
-                callers: BTreeSet::new(),
-            }]
-        );
-        assert!(prepare(&p, f.owner, &[local(unlisted), local(e1)]).is_err());
-        let p = expected_without(&p, f.owner, &[unlisted], &[]);
-        let mut p = p;
-        let extra = exchange_step(&mut p, f.owner, "Unlisted exchange", f.exchange);
-        p.elements
-            .get_mut(&f.owner)
-            .unwrap()
-            .steps_mut()
-            .unwrap()
-            .retain(|id| *id != extra);
-        let plan = prepare(&p, f.owner, &[local(e1)]).unwrap();
-        assert_eq!(
-            plan.interpretation,
-            vec![InterpretationChange {
-                owner: f.owner,
-                before: interpretation(Some(vec![e1, e2]), Some(vec![e1, e2, extra]), false),
-                after: interpretation(Some(vec![e2]), Some(vec![e2, extra]), false),
-                callers: BTreeSet::new(),
-            }]
-        );
-        assert_history(&p, &expected_without(&p, f.owner, &[e1], &[]), plan.command);
-    }
-}
-
-#[test]
-fn process_group_removal_explicit_topology_still_reports_transitive_reused_effects() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let f = super::super::direct_tests::fixture(layer);
-        let mut p = f.p;
-        maintained(&mut p, f.nodes[1], f.nodes[2]);
-        let caller = sequence(&mut p, layer, "Caller");
-        reuse(&mut p, caller, "First use", f.owner);
-        reuse(&mut p, caller, "Repeated use", f.owner);
-        let outer = sequence(&mut p, layer, "Outer");
-        reuse(&mut p, outer, "Transitive use", caller);
-        for target in [local(f.nodes[0]), Target::ProcessLink(f.link)] {
-            let plan = prepare(&p, f.owner, &[target]).unwrap();
-            assert!(
-                plan.interpretation.is_empty(),
-                "Explicit modes remain unchanged"
-            );
-            assert_eq!(
-                plan.affected_uses,
-                BTreeMap::from([(f.owner, BTreeSet::from([caller, outer]))])
-            );
-            assert!(!plan.changed.contains(&caller));
-            assert!(!plan.changed.contains(&outer));
-        }
-    }
-}
-
-#[test]
-fn process_group_removal_mixed_covered_and_independent_selected_links_delete_each_once() {
-    for layer in [Layer::Oa, Layer::Sa] {
-        let f = super::super::direct_tests::fixture(layer);
-        let mut p = f.p;
-        let [a, b, c] = f.nodes;
-        let independent = maintained(&mut p, b, c);
-        let targets = [
-            Target::ProcessLink(independent),
-            Target::ProcessLink(f.link),
-            local(a),
-        ];
-        let plan = prepare(&p, f.owner, &targets).unwrap();
-        let reverse = prepare(&p, f.owner, &targets.into_iter().rev().collect::<Vec<_>>()).unwrap();
-        assert_eq!(plan.command, reverse.command);
-        assert_eq!(plan.removed, BTreeSet::from([a, f.link, independent]));
-        assert_eq!(plan.changed, BTreeSet::from([f.owner]));
-        let Command::Batch(commands) = &plan.command else {
-            panic!()
-        };
-        assert_eq!(
-            commands,
-            &[Command::Delete(a), Command::Delete(independent)]
-        );
-        assert!(plan.interpretation.is_empty());
-        let expected = expected_without(&p, f.owner, &[a], &[f.link, independent]);
-        assert_eq!(expected.elements[&f.owner].steps().unwrap(), &[b, c]);
-        assert_history(&p, &expected, plan.command);
-    }
-}
-
-#[test]
-fn process_group_removal_exact_attachments_traces_placements_and_diagram_impact() {
-    use oa_core::{ArtifactLink, ArtifactRelation, EdgeRoute, Position, Trace, TraceKind};
-
-    for layer in [Layer::Oa, Layer::Sa] {
-        let f = super::super::direct_tests::fixture(layer);
-        let mut p = f.p;
-        let [a, b, _] = f.nodes;
-        let overview = p.ensure_diagram(layer);
-        // Overview explicitly includes Occurrence in ProjectionKind::includes;
-        // saved placement validation admits these same-layer semantic elements.
-        assert!(p.diagrams[&overview].projection.includes(Kind::Occurrence));
-        let node = p.place(overview, a, Position { x: 100., y: 100. });
-        let kept_node = p.place(overview, b, Position { x: 400., y: 100. });
-        p.diagrams
-            .get_mut(&overview)
-            .unwrap()
-            .routes
-            .push(EdgeRoute {
-                edge: f.link,
-                source_attachment: None,
-                target_attachment: None,
-                waypoints: vec![Position { x: 300., y: 80. }],
-                label: None,
-            });
-        let other_view = Id::new_v4();
-        let mut view = p.diagrams[&overview].clone();
-        view.id = other_view;
-        view.alias = p.fresh_alias("second_overview", "view", other_view);
-        view.name = "Second overview".into();
-        view.nodes.clear();
-        view.routes.clear();
-        p.diagrams.insert(other_view, view);
-        let other_node = p.place(other_view, a, Position { x: 220., y: 160. });
-        let opposite = if layer == Layer::Oa {
-            Layer::Sa
-        } else {
-            Layer::Oa
-        };
-        let counterpart = p
-            .add_element(
-                if opposite == Layer::Oa {
-                    Kind::Activity
-                } else {
-                    Kind::Function
-                },
-                opposite,
-                "Preserved counterpart",
-                None,
-            )
-            .unwrap();
-        let unrelated_view = p.ensure_diagram(opposite);
-        p.place(unrelated_view, counterpart, Position { x: 50., y: 75. });
-        let traces: [Id; 2] = [a, b].map(|subject| {
-            let id = Id::new_v4();
-            p.traces.insert(
-                id,
-                Trace {
-                    id,
-                    alias: p.fresh_alias("manual_trace", "trace", id),
-                    name: "Manual correspondence".into(),
-                    description: "Preserve counterpart".into(),
-                    oa: if layer == Layer::Oa {
-                        subject
-                    } else {
-                        counterpart
-                    },
-                    sa: if layer == Layer::Sa {
-                        subject
-                    } else {
-                        counterpart
-                    },
-                    kind: TraceKind::Manual,
-                    baseline: None,
-                },
-            );
-            id
-        });
-        // Include an attachment owned by the dependent placement: core impact
-        // must follow the fixed point rather than only direct semantic subjects.
-        let artifacts: [Id; 4] = [a, node, f.link, b].map(|owner| {
-            let id = Id::new_v4();
-            p.artifact_links.insert(
-                id,
-                ArtifactLink {
-                    id,
-                    alias: p.fresh_alias("evidence", "artifact", id),
-                    name: "Evidence".into(),
-                    description: "Authored evidence".into(),
-                    owner,
-                    relation: ArtifactRelation::References,
-                    uri: "evidence.txt".into(),
-                    revision: Some("v1".into()),
-                    fragment: Some("review".into()),
-                },
-            );
-            id
-        });
-        let constraint = p
-            .add_element(Kind::Constraint, layer, "Surviving constraint", None)
-            .unwrap();
-        *p.elements
-            .get_mut(&constraint)
-            .unwrap()
-            .shared_mut()
-            .unwrap() = SharedBody::Constraint {
-            expression: "review".into(),
-            constrained: vec![a, b],
-        };
-        oa_core::session::validate_candidate(&p).unwrap();
-        let plan = prepare(&p, f.owner, &[local(a)]).unwrap();
-        assert_eq!(
-            plan.removed,
-            BTreeSet::from([
-                a,
-                f.link,
-                node,
-                other_node,
-                traces[0],
-                artifacts[0],
-                artifacts[1],
-                artifacts[2],
-            ])
-        );
-        assert_eq!(
-            plan.changed,
-            BTreeSet::from([f.owner, overview, other_view, constraint])
-        );
-        assert_eq!(
-            plan.affected_uses,
-            BTreeMap::from([(f.owner, BTreeSet::new())])
-        );
-        let mut expected = expected_without(&p, f.owner, &[a], &[f.link]);
-        expected.traces.remove(&traces[0]);
-        for id in &artifacts[..3] {
-            expected.artifact_links.remove(id);
-        }
-        expected
-            .diagrams
-            .get_mut(&overview)
-            .unwrap()
-            .nodes
-            .remove(&node);
-        expected.diagrams.get_mut(&overview).unwrap().routes.clear();
-        expected
-            .diagrams
-            .get_mut(&other_view)
-            .unwrap()
-            .nodes
-            .remove(&other_node);
-        let Some(SharedBody::Constraint { constrained, .. }) =
-            expected.elements.get_mut(&constraint).unwrap().shared_mut()
-        else {
-            panic!()
-        };
-        *constrained = vec![b];
-        assert_eq!(expected.elements[&counterpart], p.elements[&counterpart]);
-        assert_eq!(
-            expected.diagrams[&overview].nodes[&kept_node],
-            p.diagrams[&overview].nodes[&kept_node]
-        );
-        assert_eq!(
-            expected.diagrams[&unrelated_view],
-            p.diagrams[&unrelated_view]
-        );
-        assert_eq!(expected.traces[&traces[1]], p.traces[&traces[1]]);
-        assert_eq!(
-            expected.artifact_links[&artifacts[3]],
-            p.artifact_links[&artifacts[3]]
-        );
-        assert_history(&p, &expected, plan.command);
-    }
-}

crates/oa-desktop/src/behavior/topology/view.rs

@@ -185,7 +185,6 @@ pub(super) fn view<'a>(app: &'a App, owner: Id, out: Column<'a, Message>) -> Ele
         &state.contextual_expanded,
     );
     graph.selection = app.multiselect_snapshot();
-    graph.removal_input = state.removal_input.clone();
     graph.selected_preview = state
         .qualified_selection(p, owner)
         .filter(|address| {
@@ -575,15 +574,6 @@ fn selection_controls(app: &App) -> Element<'_, Message> {
         .align_y(iced::Center)
         .height(32);
     if let Some(snapshot) = snapshot.filter(|s| !s.targets().is_empty()) {
-        if snapshot.targets().len() > 1 {
-            controls = controls.push(
-                button("Remove selected…").on_press_maybe(
-                    app.process_removal_enabled()
-                        .then(|| crate::app::process_removal::begin(app))
-                        .flatten(),
-                ),
-            );
-        }
         controls = controls.push(button("Clear selection").on_press_maybe(
             enabled.then(|| Message::DiagramSelection(SelectionEvent::Clear(snapshot.context()))),
         ));

crates/oa-desktop/src/diagram.rs

@@ -42,8 +42,8 @@ mod port_labels;
 pub use port_labels::PortLabels;
 #[path = "diagram/focus.rs"]
 pub(crate) mod focus;
+mod grid;
 pub(crate) mod group_gesture;
-pub(crate) mod group_removal;
 mod multiselect;
 #[cfg(test)]
 mod multiselect_tests;
@@ -53,7 +53,6 @@ pub use work_drag::WorkFeedback;
 
 #[derive(Clone, Copy)]
 pub struct DiagramCanvas<'a> {
-    pub removal_input: &'a crate::removal_input::Lifetime,
     pub selection: Option<&'a crate::diagram_selection::Selection>,
     pub allocation: Option<crate::app::allocation_drag::Capability<'a>>,
     pub project: &'a Project,
@@ -73,8 +72,7 @@ pub struct DiagramCanvas<'a> {
 }
 #[derive(Default)]
 pub struct State {
-    removal_lease: Option<crate::removal_input::Lease>,
-    removal_viewport: Option<(f32, Vector, Rectangle)>,
+    grid: grid::Grid,
     modifiers: iced::keyboard::Modifiers,
     group: Option<multiselect::Press>,
     work: Option<Arc<crate::app::allocation_drag::Press>>,
@@ -610,8 +608,9 @@ impl DiagramCanvas<'_> {
         });
     }
 }
-impl DiagramCanvas<'_> {
-    fn update_input(
+impl canvas::Program<Message> for DiagramCanvas<'_> {
+    type State = State;
+    fn update(
         &self,
         state: &mut State,
         event: &canvas::Event,
@@ -1246,67 +1245,6 @@ impl DiagramCanvas<'_> {
             _ => None,
         }
     }
-}
-impl canvas::Program<Message> for DiagramCanvas<'_> {
-    type State = State;
-    fn update(
-        &self,
-        state: &mut State,
-        event: &canvas::Event,
-        bounds: Rectangle,
-        cursor: mouse::Cursor,
-    ) -> Option<Action<Message>> {
-        self.removal_input.sync(
-            &mut state.removal_lease,
-            state.group.is_some()
-                || state.work.is_some()
-                || state.drag.is_some()
-                || state.pan_start.is_some()
-                || state.route_drag.is_some()
-                || state.connection_press.is_some()
-                || state.port_drag.is_some(),
-        );
-        self.removal_input.observe(event);
-        let viewport = (self.zoom, self.pan, bounds);
-        if state
-            .removal_viewport
-            .is_some_and(|previous| previous != viewport)
-        {
-            self.removal_input.revoke_idle();
-        }
-        state.removal_viewport = Some(viewport);
-        let action = self.update_input(state, event, bounds, cursor);
-        if matches!(
-            event,
-            canvas::Event::Window(iced::window::Event::Unfocused | iced::window::Event::Resized(_))
-                | canvas::Event::Mouse(mouse::Event::CursorLeft)
-        ) {
-            // The viewport can synthesize Unfocused when it takes camera input.
-            // Never leave a private drag or its lease waiting for a lost release.
-            state.group = None;
-            state.work = None;
-            state.drag = None;
-            state.preview = None;
-            state.pan_start = None;
-            state.route_drag = None;
-            state.attachment_viewport = None;
-            state.connection_press = None;
-            state.connection_hover = None;
-            state.port_drag = None;
-            state.pointer = None;
-        }
-        self.removal_input.sync(
-            &mut state.removal_lease,
-            state.group.is_some()
-                || state.work.is_some()
-                || state.drag.is_some()
-                || state.pan_start.is_some()
-                || state.route_drag.is_some()
-                || state.connection_press.is_some()
-                || state.port_drag.is_some(),
-        );
-        action
-    }
     fn draw(
         &self,
         state: &State,
@@ -1315,23 +1253,10 @@ impl canvas::Program<Message> for DiagramCanvas<'_> {
         bounds: Rectangle,
         _: mouse::Cursor,
     ) -> Vec<canvas::Geometry> {
+        let background = state
+            .grid
+            .draw(renderer, bounds.size(), self.zoom, self.pan);
         let mut f = Frame::new(renderer, bounds.size());
-        f.fill_rectangle(
-            Point::ORIGIN,
-            bounds.size(),
-            Color::from_rgb8(246, 248, 251),
-        );
-        let step = (24. * self.zoom).max(14.);
-        let ox = self.pan.x.rem_euclid(step);
-        let oy = self.pan.y.rem_euclid(step);
-        for x in 0..(bounds.width / step) as i32 + 1 {
-            for y in 0..(bounds.height / step) as i32 + 1 {
-                f.fill(
-                    &Path::circle(Point::new(ox + x as f32 * step, oy + y as f32 * step), 0.65),
-                    style::LINE,
-                );
-            }
-        }
         f.translate(self.pan);
         f.scale(self.zoom);
         let scene = self.scene(state);
@@ -1734,7 +1659,7 @@ impl canvas::Program<Message> for DiagramCanvas<'_> {
                 ..Default::default()
             });
         }
-        vec![f.into_geometry(), overlay.into_geometry()]
+        vec![background, f.into_geometry(), overlay.into_geometry()]
     }
     fn mouse_interaction(
         &self,
@@ -2392,7 +2317,6 @@ mod tests {
             y: original.y - 200.,
         };
         let canvas = DiagramCanvas {
-            removal_input: &crate::removal_input::Lifetime::default(),
             selection: None,
             project: &p,
             view_index: None,
@@ -2471,7 +2395,6 @@ mod tests {
             .unwrap()
             .id;
         let canvas = DiagramCanvas {
-            removal_input: &crate::removal_input::Lifetime::default(),
             selection: None,
             project: &p,
             view_index: None,
@@ -2601,7 +2524,6 @@ mod tests {
             };
             let session = Session::new(&p, &view, context, Tool::FunctionalExchange);
             let canvas = DiagramCanvas {
-                removal_input: &crate::removal_input::Lifetime::default(),
                 selection: None,
                 project: &p,
                 view_index: None,
@@ -2778,7 +2700,6 @@ mod tests {
         for zoom in [0.5, 1., 1.5] {
             let (p, diagram, edge) = route_fixture();
             let canvas = DiagramCanvas {
-                removal_input: &crate::removal_input::Lifetime::default(),
                 selection: None,
                 project: &p,
                 view_index: None,
@@ -2858,7 +2779,6 @@ mod tests {
     fn fast_drags_commit_the_release_cursor_without_a_final_motion_event() {
         let (p, diagram, edge) = route_fixture();
         let canvas = DiagramCanvas {
-            removal_input: &crate::removal_input::Lifetime::default(),
             selection: None,
             project: &p,
             view_index: None,
@@ -2959,7 +2879,6 @@ mod tests {
     fn route_cache_ignores_pan_zoom_and_cancelled_drag_cannot_commit() {
         let (p, diagram, edge) = route_fixture();
         let mut canvas = DiagramCanvas {
-            removal_input: &crate::removal_input::Lifetime::default(),
             selection: None,
             project: &p,
             view_index: None,
@@ -3091,7 +3010,6 @@ mod tests {
             assert!(!svg.contains("data-navigation=\"source\""));
             assert!(svg.contains("data-navigation=\"target\""));
             let mut canvas = DiagramCanvas {
-                removal_input: &crate::removal_input::Lifetime::default(),
                 selection: None,
                 project: &p,
                 view_index: None,
@@ -3149,7 +3067,6 @@ mod tests {
             offset: Position { x: 0., y: -160. },
         });
         let mut canvas = DiagramCanvas {
-            removal_input: &crate::removal_input::Lifetime::default(),
             selection: None,
             project: &p,
             view_index: None,
@@ -3227,7 +3144,6 @@ mod tests {
             },
         });
         let canvas = DiagramCanvas {
-            removal_input: &crate::removal_input::Lifetime::default(),
             selection: None,
             project: &p,
             view_index: None,
@@ -3264,7 +3180,6 @@ mod tests {
         routed.edges.insert(duplicate, duplicate_route);
         let selected = edge.max(duplicate); // UUID ordering must not override selection.
         let canvas = DiagramCanvas {
-            removal_input: &crate::removal_input::Lifetime::default(),
             selection: None,
             project: &p,
             view_index: None,

crates/oa-desktop/src/diagram/allocation_group_tests.rs

@@ -98,7 +98,6 @@ fn fixture(control: Control, cover: Option<Kind>) -> Fixture {
 }
 fn canvas(app: &App) -> DiagramCanvas<'_> {
     DiagramCanvas {
-        removal_input: &app.saved_removal_input,
         selection: app.diagram_selection.as_ref(),
         allocation: Some(app.allocation_capability()),
         project: app.project(),

crates/oa-desktop/src/diagram/attachment_tests.rs

@@ -34,7 +34,6 @@ fn fixture() -> App {
 
 fn canvas(app: &App, zoom: f32) -> DiagramCanvas<'_> {
     DiagramCanvas {
-        removal_input: &app.saved_removal_input,
         selection: None,
         allocation: None,
         project: app.project(),

crates/oa-desktop/src/diagram/focus.rs

@@ -206,16 +206,6 @@ impl<Message, R: renderer::Renderer> Widget<Message, Theme, R> for Owner<'_, Mes
             // The focus task runs after the native batch. Retain focus for its
             // traversal count, but reject later keys in this same batch now.
             state.traversing = true;
-            self.content.as_widget_mut().update(
-                &mut tree.children[0],
-                &InputEvent::Window(iced::window::Event::Unfocused),
-                layout,
-                cursor,
-                renderer,
-                clipboard,
-                shell,
-                viewport,
-            );
             shell.publish((self.traverse)(modifiers.shift()));
             shell.capture_event();
             return;

crates/oa-desktop/src/diagram/grid.rs

@@ -0,0 +1,50 @@
+//! Screen-space background geometry, independent of the model and pointer.
+use super::*;
+use std::cell::Cell;
+
+#[derive(Default)]
+pub(super) struct Grid {
+    geometry: canvas::Cache,
+    camera: Cell<Option<(f32, Vector)>>,
+    #[cfg(test)]
+    builds: Cell<usize>,
+}
+
+impl Grid {
+    pub(super) fn draw(
+        &self,
+        renderer: &Renderer,
+        size: Size,
+        zoom: f32,
+        pan: Vector,
+    ) -> canvas::Geometry {
+        // Cache::draw handles exact size changes. Raw camera equality is
+        // deliberately conservative: do not quantize fractional antialiasing.
+        if self.camera.replace(Some((zoom, pan))) != Some((zoom, pan)) {
+            self.geometry.clear();
+        }
+        self.geometry.draw(renderer, size, |frame| {
+            #[cfg(test)]
+            self.builds.set(self.builds.get() + 1);
+            paint(frame, size, zoom, pan);
+        })
+    }
+}
+
+fn paint(frame: &mut Frame, size: Size, zoom: f32, pan: Vector) {
+    frame.fill_rectangle(Point::ORIGIN, size, Color::from_rgb8(246, 248, 251));
+    let step = (24. * zoom).max(14.);
+    let ox = pan.x.rem_euclid(step);
+    let oy = pan.y.rem_euclid(step);
+    for x in 0..(size.width / step) as i32 + 1 {
+        for y in 0..(size.height / step) as i32 + 1 {
+            frame.fill(
+                &Path::circle(Point::new(ox + x as f32 * step, oy + y as f32 * step), 0.65),
+                style::LINE,
+            );
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests;

crates/oa-desktop/src/diagram/grid/tests.rs

@@ -0,0 +1,378 @@
+use super::*;
+use iced::advanced::{
+    graphics::geometry::Renderer as _,
+    renderer::{Headless, Renderer as _},
+};
+
+async fn renderer() -> Renderer {
+    <Renderer as Headless>::new(iced::Font::DEFAULT, 16.into(), None)
+        .await
+        .expect("grid tests require the supported WGPU headless renderer")
+}
+
+#[tokio::test]
+async fn cache_reuses_unchanged_inputs_and_rebuilds_for_each_camera_or_size_change() {
+    let renderer = renderer().await;
+    let grid = Grid::default();
+    let original = Size::new(320., 240.);
+    let threshold = 14. / 24.;
+    // Each row changes exactly one dependency from its predecessor. Returning
+    // to old dimensions must invalidate too; this cache holds one viewport.
+    let cases = [
+        ("initial", original, 1., Vector::ZERO),
+        ("positive x pan", original, 1., Vector::new(24., 0.)),
+        ("negative x pan", original, 1., Vector::new(-24., 0.)),
+        ("fractional x pan", original, 1., Vector::new(-24.25, 0.)),
+        ("positive y pan", original, 1., Vector::new(-24.25, 18.)),
+        ("negative y pan", original, 1., Vector::new(-24.25, -18.)),
+        ("fractional y pan", original, 1., Vector::new(-24.25, -18.5)),
+        ("return to zero pan", original, 1., Vector::ZERO),
+        ("zoom at zero pan", original, 1.25, Vector::ZERO),
+        (
+            "below spacing threshold",
+            original,
+            threshold - 0.001,
+            Vector::ZERO,
+        ),
+        ("at spacing threshold", original, threshold, Vector::ZERO),
+        (
+            "above spacing threshold",
+            original,
+            threshold + 0.001,
+            Vector::ZERO,
+        ),
+        (
+            "width only",
+            Size::new(321., 240.),
+            threshold + 0.001,
+            Vector::ZERO,
+        ),
+        ("return width", original, threshold + 0.001, Vector::ZERO),
+        (
+            "height only",
+            Size::new(320., 241.),
+            threshold + 0.001,
+            Vector::ZERO,
+        ),
+        ("return height", original, threshold + 0.001, Vector::ZERO),
+        (
+            "fractional width",
+            Size::new(320.25, 240.),
+            threshold + 0.001,
+            Vector::ZERO,
+        ),
+        (
+            "fractional height",
+            Size::new(320.25, 240.5),
+            threshold + 0.001,
+            Vector::ZERO,
+        ),
+    ];
+    for (index, (label, size, zoom, pan)) in cases.into_iter().enumerate() {
+        let _ = grid.draw(&renderer, size, zoom, pan);
+        assert_eq!(grid.builds.get(), index + 1, "{label} must rebuild");
+        for _ in 0..3 {
+            let _ = grid.draw(&renderer, size, zoom, pan);
+            assert_eq!(grid.builds.get(), index + 1, "{label} must reuse");
+        }
+    }
+}
+
+// Independent reference copied from the former DiagramCanvas::draw background
+// pass. Do not call grid::paint here: a shared implementation would hide changes
+// in spacing, phase, radius, color, or coverage from the parity comparison.
+fn legacy_background(frame: &mut Frame, size: Size, zoom: f32, pan: Vector) {
+    frame.fill_rectangle(Point::ORIGIN, size, Color::from_rgb8(246, 248, 251));
+    let spacing = (24. * zoom).max(14.);
+    let offset_x = pan.x.rem_euclid(spacing);
+    let offset_y = pan.y.rem_euclid(spacing);
+    for column in 0..(size.width / spacing) as i32 + 1 {
+        for row in 0..(size.height / spacing) as i32 + 1 {
+            frame.fill(
+                &Path::circle(
+                    Point::new(
+                        offset_x + column as f32 * spacing,
+                        offset_y + row as f32 * spacing,
+                    ),
+                    0.65,
+                ),
+                Color::from_rgb(0.86, 0.89, 0.91),
+            );
+        }
+    }
+}
+
+fn foreground(frame: &mut Frame, zoom: f32, pan: Vector, changed: bool) {
+    frame.translate(pan);
+    frame.scale(zoom);
+    // Crossing paths pass behind opaque cards. The long paths also cross the
+    // screen-space warning, making geometry order observable.
+    for (start, end, color) in [
+        (Point::new(0., 20.), Point::new(300., 210.), style::TEAL),
+        (Point::new(0., 210.), Point::new(300., 20.), style::BOUNDARY),
+    ] {
+        frame.stroke(
+            &Path::line(start, end),
+            Stroke::default().with_color(color).with_width(3.),
+        );
+    }
+    let shift = if changed { 19.5 } else { 0. };
+    frame.fill_rectangle(
+        Point::new(12., 92.),
+        Size::new(270., 35.),
+        Color::from_rgba(0.1, 0.6, 0.5, 0.25),
+    );
+    for (position, size, title) in [
+        (Point::new(32. + shift, 58.), Size::new(116., 72.), "Sensor"),
+        (Point::new(172., 139.), Size::new(118., 66.), "Controller"),
+    ] {
+        frame.fill_rectangle(position, size, Color::WHITE);
+        frame.stroke(
+            &Path::rectangle(position, size),
+            Stroke::default().with_color(style::BOUNDARY).with_width(1.),
+        );
+        frame.fill_text(Text {
+            content: title.into(),
+            position: position + Vector::new(8., 12.),
+            color: style::INK,
+            size: 13.into(),
+            ..Default::default()
+        });
+    }
+    // Selection paint and handles remain live foreground data, including when
+    // the underlying background cache is reused after an edit.
+    frame.stroke(
+        &Path::rectangle(Point::new(29. + shift, 55.), Size::new(122., 78.)),
+        Stroke::default().with_color(style::TEAL).with_width(2.),
+    );
+    frame.fill_rectangle(Point::new(26. + shift, 52.), Size::new(6., 6.), style::TEAL);
+    frame.fill_text(Text {
+        content: if changed {
+            "Edited connection"
+        } else {
+            "Connection"
+        }
+        .into(),
+        position: Point::new(116., 113.),
+        color: style::INK,
+        size: 11.into(),
+        ..Default::default()
+    });
+}
+
+fn warning(frame: &mut Frame, size: Size) {
+    frame.fill_rectangle(
+        Point::new(8., 8.),
+        Size::new((size.width - 16.).max(0.), 30.),
+        Color::WHITE,
+    );
+    frame.fill_text(Text {
+        content: "1 connection route needs attention".into(),
+        position: Point::new(16., 15.),
+        color: style::MUTED,
+        size: 12.into(),
+        ..Default::default()
+    });
+}
+
+fn legacy_geometry(
+    renderer: &Renderer,
+    size: Size,
+    zoom: f32,
+    pan: Vector,
+    changed: bool,
+) -> Vec<canvas::Geometry> {
+    let mut combined = Frame::new(renderer, size);
+    legacy_background(&mut combined, size, zoom, pan);
+    foreground(&mut combined, zoom, pan, changed);
+    let mut overlay = Frame::new(renderer, size);
+    warning(&mut overlay, size);
+    vec![combined.into_geometry(), overlay.into_geometry()]
+}
+
+fn cached_geometry(
+    grid: &Grid,
+    renderer: &Renderer,
+    size: Size,
+    zoom: f32,
+    pan: Vector,
+    changed: bool,
+) -> Vec<canvas::Geometry> {
+    let background = grid.draw(renderer, size, zoom, pan);
+    let mut content = Frame::new(renderer, size);
+    foreground(&mut content, zoom, pan, changed);
+    let mut overlay = Frame::new(renderer, size);
+    warning(&mut overlay, size);
+    vec![background, content.into_geometry(), overlay.into_geometry()]
+}
+
+fn pixels(renderer: &mut Renderer, size: Size, geometry: Vec<canvas::Geometry>) -> Vec<u8> {
+    // Keep physical screenshot dimensions and renderer viewport consistent even
+    // for fractional canvas bounds; the geometry itself keeps its exact size.
+    let physical = Size::new(size.width.ceil() as u32, size.height.ceil() as u32);
+    renderer.reset(Rectangle::with_size(Size::new(
+        physical.width as f32,
+        physical.height as f32,
+    )));
+    for layer in geometry {
+        renderer.draw_geometry(layer);
+    }
+    let pixels = Headless::screenshot(renderer, physical, 1., style::BG);
+    assert_eq!(
+        pixels.len(),
+        physical.width as usize * physical.height as usize * 4
+    );
+    pixels
+}
+
+fn assert_same_pixels(expected: &[u8], actual: &[u8], label: &str) {
+    assert_eq!(expected.len(), actual.len(), "{label}: dimensions");
+    let differing = expected
+        .as_chunks::<4>()
+        .0
+        .iter()
+        .zip(actual.as_chunks::<4>().0)
+        .filter(|(a, b)| a != b)
+        .count();
+    assert_eq!(differing, 0, "{label}: changed RGBA pixels");
+}
+
+#[tokio::test]
+async fn cached_background_preserves_pixels_and_live_foreground_across_camera_and_size_changes() {
+    let mut renderer = renderer().await;
+    let grid = Grid::default();
+    let original = Size::new(320., 240.);
+    let threshold = 14. / 24.;
+    for (label, size, zoom, pan) in [
+        ("origin", original, 1., Vector::ZERO),
+        ("positive pan", original, 1., Vector::new(17., 11.)),
+        ("negative pan", original, 1., Vector::new(-17., -11.)),
+        ("fractional pan", original, 1., Vector::new(-17.25, 11.5)),
+        ("zoom zero pan", original, 1.25, Vector::ZERO),
+        ("below threshold", original, threshold - 0.001, Vector::ZERO),
+        ("at threshold", original, threshold, Vector::ZERO),
+        ("above threshold", original, threshold + 0.001, Vector::ZERO),
+        ("width resize", Size::new(327., 240.), 1., Vector::ZERO),
+        ("height resize", Size::new(327., 247.), 1., Vector::ZERO),
+        ("return size", original, 1., Vector::ZERO),
+        (
+            "fractional bounds",
+            Size::new(319.25, 239.5),
+            1.,
+            Vector::new(-0.5, 0.25),
+        ),
+    ] {
+        let old = legacy_geometry(&renderer, size, zoom, pan, false);
+        let expected = pixels(&mut renderer, size, old);
+        let layers = cached_geometry(&grid, &renderer, size, zoom, pan, false);
+        let actual = pixels(&mut renderer, size, layers);
+        assert_same_pixels(&expected, &actual, label);
+        let builds = grid.builds.get();
+        let reused = cached_geometry(&grid, &renderer, size, zoom, pan, false);
+        let reused = pixels(&mut renderer, size, reused);
+        assert_same_pixels(&expected, &reused, label);
+        assert_eq!(grid.builds.get(), builds, "{label}: screenshot reuse");
+
+        let edited_old = legacy_geometry(&renderer, size, zoom, pan, true);
+        let edited_expected = pixels(&mut renderer, size, edited_old);
+        assert_ne!(
+            expected, edited_expected,
+            "{label}: edit must visibly change foreground"
+        );
+        let edited = cached_geometry(&grid, &renderer, size, zoom, pan, true);
+        let edited = pixels(&mut renderer, size, edited);
+        assert_same_pixels(&edited_expected, &edited, label);
+        assert_eq!(
+            grid.builds.get(),
+            builds,
+            "{label}: foreground edit must reuse grid"
+        );
+    }
+}
+
+#[tokio::test]
+async fn actual_canvas_keeps_background_cached_while_selection_and_revision_change() {
+    use super::super::{Context, DiagramCanvas, State};
+    let mut renderer = renderer().await;
+    let mut project = Project::empty();
+    let a = project
+        .add_element(Kind::Entity, Layer::Oa, "Sensor", None)
+        .unwrap();
+    let b = project
+        .add_element(Kind::Actor, Layer::Oa, "Controller", None)
+        .unwrap();
+    let diagram = project.ensure_diagram(Layer::Oa);
+    project.diagrams.get_mut(&diagram).unwrap().projection = ProjectionKind::Overview;
+    let node = project.place(diagram, a, Position { x: 20., y: 50. });
+    project.place(diagram, b, Position { x: 100., y: 160. });
+    project.relate(RelationKind::CommunicationMean, "Link", a, b);
+    let mut canvas = DiagramCanvas {
+        selection: None,
+        allocation: None,
+        project: &project,
+        view_index: None,
+        diagram,
+        selected: a,
+        navigation_focus: None,
+        zoom: 0.75,
+        pan: Vector::ZERO,
+        context: Context {
+            document: project.id,
+            diagram,
+            revision: 0,
+            epoch: 0,
+        },
+        selected_bend: None,
+        selected_attachment: None,
+        editable: true,
+        placing: false,
+        connection: None,
+    };
+    let state = State::default();
+    let size = Size::new(360., 280.);
+    let bounds = Rectangle::with_size(size);
+    let draw = |canvas: &DiagramCanvas<'_>, renderer: &Renderer, bounds| {
+        canvas::Program::draw(
+            canvas,
+            &state,
+            renderer,
+            &crate::style::theme(),
+            bounds,
+            mouse::Cursor::Unavailable,
+        )
+    };
+    let layers = draw(&canvas, &renderer, bounds);
+    assert_eq!(layers.len(), 3, "background, scene, warning overlay");
+    let original = pixels(&mut renderer, size, layers);
+    assert_eq!(state.grid.builds.get(), 1);
+    canvas.selected = b;
+    let layers = draw(&canvas, &renderer, bounds);
+    let selected = pixels(&mut renderer, size, layers);
+    assert_ne!(original, selected, "selection must remain live");
+    assert_eq!(state.grid.builds.get(), 1);
+    let mut changed = project.clone();
+    changed
+        .diagrams
+        .get_mut(&diagram)
+        .unwrap()
+        .nodes
+        .get_mut(&node)
+        .unwrap()
+        .position
+        .x += 30.;
+    canvas.project = &changed;
+    canvas.context.revision += 1;
+    let layers = draw(&canvas, &renderer, bounds);
+    let moved = pixels(&mut renderer, size, layers);
+    assert_ne!(selected, moved, "new model revision must remain live");
+    assert_eq!(state.grid.builds.get(), 1);
+    canvas.pan.x = -0.25;
+    let _ = draw(&canvas, &renderer, bounds);
+    assert_eq!(state.grid.builds.get(), 2);
+    let _ = draw(
+        &canvas,
+        &renderer,
+        Rectangle::with_size(Size::new(361., 280.)),
+    );
+    assert_eq!(state.grid.builds.get(), 3);
+}

crates/oa-desktop/src/diagram/group_removal.rs

@@ -1,161 +0,0 @@
-//! Pure, whole-selection Delete from model planning for saved architecture and
-//! State views. UI lifetime, drafts and confirmation remain the caller's concern.
-use crate::diagram_usage::Target;
-use oa_core::{
-    Command, Id, Kind, Project, execute_batch, projection, references, validate_candidate,
-};
-use std::collections::{BTreeMap, BTreeSet};
-
-#[derive(Debug)]
-pub(crate) struct Plan {
-    pub(crate) command: Command,
-    /// Semantic identities resolved from every admitted exact target.
-    pub(crate) selected: BTreeSet<Id>,
-    /// Actual identity and surviving-record differences after the complete batch.
-    pub(crate) removed: BTreeSet<Id>,
-    pub(crate) changed: BTreeSet<Id>,
-    pub(crate) interpretation: Vec<crate::removal_effects::InterpretationChange>,
-    /// Changed or deleted definitions and surviving transitive callers.
-    pub(crate) affected_uses: BTreeMap<Id, BTreeSet<Id>>,
-}
-
-pub(crate) fn prepare(project: &Project, diagram: Id, targets: &[Target]) -> Result<Plan, String> {
-    let saved = project
-        .diagrams
-        .get(&diagram)
-        .ok_or("The saved view no longer exists.")?;
-    if !saved.projection.is_architecture() && saved.projection.state_machine().is_none() {
-        return Err("Delete from model supports saved Architecture and State views here.".into());
-    }
-    if targets.is_empty() {
-        return Err("Select at least one visible model object to delete.".into());
-    }
-    validate_candidate(project).map_err(|error| error.to_string())?;
-    let view = projection::project_diagram(project, saved);
-    let mut selected = BTreeSet::new();
-    // Resolve every original typed identity BEFORE removing any cascade overlap.
-    // A stale/hidden/wrong-kind target cannot become admissible because another
-    // selection member would happen to delete its semantic identity.
-    for (index, target) in targets.iter().enumerate() {
-        if targets[..index].contains(target) {
-            return Err("Every selected exact target must be unique.".into());
-        }
-        let id = match target {
-            Target::Placement(id) => saved.nodes.get(id)
-                .filter(|node| view.nodes.iter().any(|visible| visible.id == *id && visible.element == node.element))
-                .map(|node| node.element)
-                .ok_or("A selected placement is no longer visible in this saved view.")?,
-            Target::Port { port, placement } => {
-                let owner = saved.nodes.get(placement)
-                    .ok_or("A selected port's exact owner placement no longer exists in this view.")?;
-                if !view.ports.iter().any(|visible| visible.element == *port && visible.owner == *placement)
-                    || !project.elements.get(port).is_some_and(|element| element.kind() == Kind::Port && element.parent == Some(owner.element))
-                {
-                    return Err("A selected port is no longer visible on its exact owner placement.".into());
-                }
-                *port
-            }
-            Target::Edge(id) => {
-                if !view.edges.iter().any(|edge| edge.id == *id)
-                    || !(project.relations.contains_key(id) || project.traces.contains_key(id))
-                {
-                    return Err("Every selected edge must be a visible stored relation or trace; inferred edges are read-only.".into());
-                }
-                *id
-            }
-            Target::StateRow { placement, relation } => {
-                if !crate::behavior::state_canvas::visible_row_target(project, diagram, &view, *placement, *relation) {
-                    return Err("A selected State row is no longer visible on its exact placement.".into());
-                }
-                *relation
-            }
-            _ => return Err("The complete selection must contain only visible placements, ports, stored edges or State rows; grouping and read-only targets cannot be deleted here.".into()),
-        };
-        selected.insert(id);
-    }
-
-    // Prefer cascades covering the most remaining selected subjects. Selecting a
-    // parent together with its child/port/incident relation must not issue Delete
-    // for an identity already removed by that parent. Stable ID order breaks ties.
-    // Core defers conditional exchange-allocation cleanup until batch completion;
-    // admission and the final result are therefore never singleton-validated.
-    let impacts: BTreeMap<_, _> = selected
-        .iter()
-        .map(|&id| (id, references::deletion_impact(project, id)))
-        .collect();
-    let mut pending = selected.clone();
-    let mut commands = Vec::new();
-    while !pending.is_empty() {
-        let id = *pending
-            .iter()
-            .max_by_key(|&&id| {
-                (
-                    impacts[&id].intersection(&pending).count(),
-                    std::cmp::Reverse(id),
-                )
-            })
-            .unwrap();
-        commands.push(Command::Delete(id));
-        pending.retain(|remaining| !impacts[&id].contains(remaining));
-    }
-    let command = Command::Batch(commands);
-    let candidate = execute_batch(project, std::slice::from_ref(&command))
-        .map_err(|error| error.to_string())?;
-    let original: BTreeSet<_> = project.identities().into_iter().map(|(id, _)| id).collect();
-    let retained: BTreeSet<_> = candidate
-        .identities()
-        .into_iter()
-        .map(|(id, _)| id)
-        .collect();
-    if !retained.is_subset(&original) {
-        return Err("Removal unexpectedly created model identities; no change was applied.".into());
-    }
-    let removed: BTreeSet<_> = original.difference(&retained).copied().collect();
-    if !selected.is_subset(&removed) {
-        return Err("The complete selected set could not be removed.".into());
-    }
-    let mut changed = BTreeSet::new();
-    changed_records(&project.elements, &candidate.elements, &mut changed);
-    changed_records(&project.relations, &candidate.relations, &mut changed);
-    changed_records(&project.diagrams, &candidate.diagrams, &mut changed);
-    changed_records(&project.traces, &candidate.traces, &mut changed);
-    changed_records(
-        &project.artifact_links,
-        &candidate.artifact_links,
-        &mut changed,
-    );
-    for (&id, diagram) in &project.diagrams {
-        if let Some(after) = candidate.diagrams.get(&id) {
-            changed_records(&diagram.nodes, &after.nodes, &mut changed);
-        }
-    }
-    let crate::removal_effects::DerivedEffects {
-        interpretation,
-        affected_uses,
-    } = crate::removal_effects::analyze(project, &candidate, &removed, &changed);
-    Ok(Plan {
-        command,
-        selected,
-        removed,
-        changed,
-        interpretation,
-        affected_uses,
-    })
-}
-
-fn changed_records<T: PartialEq>(
-    before: &BTreeMap<Id, T>,
-    after: &BTreeMap<Id, T>,
-    changed: &mut BTreeSet<Id>,
-) {
-    changed.extend(
-        before
-            .iter()
-            .filter_map(|(&id, record)| after.get(&id).filter(|next| *next != record).map(|_| id)),
-    );
-}
-
-#[cfg(test)]
-mod conditional_tests;
-#[cfg(test)]
-mod tests;

crates/oa-desktop/src/diagram/group_removal/conditional_tests.rs

@@ -1,302 +0,0 @@
-//! Independent conditional-cascade checks for overlapping selected endpoint allocations.
-use super::prepare;
-use crate::diagram_usage::Target;
-use oa_core::*;
-use std::collections::BTreeSet;
-
-struct Fixture {
-    project: Project,
-    diagram: Id,
-    selected_allocations: [Id; 2],
-    exchange_allocation: Id,
-    functional_exchange: Id,
-}
-
-fn relation(project: &mut Project, number: u128, alias: &str, body: RelationBody) -> Id {
-    let id = Id::from_u128(number);
-    assert!(
-        project
-            .relations
-            .insert(
-                id,
-                Relation {
-                    id,
-                    alias: alias.into(),
-                    name: alias.into(),
-                    description: String::new(),
-                    body,
-                }
-            )
-            .is_none()
-    );
-    id
-}
-
-fn fixture(reverse_ids: bool, invalid_dual_mapping: bool) -> Fixture {
-    let mut project = Project::empty();
-    let performer = project
-        .add_element(Kind::System, Layer::Sa, "Send performer", None)
-        .unwrap();
-    let receiver = if invalid_dual_mapping {
-        performer
-    } else {
-        project
-            .add_element(Kind::SystemActor, Layer::Sa, "Receive performer", None)
-            .unwrap()
-    };
-    let source = project
-        .add_element(Kind::Function, Layer::Sa, "Send", None)
-        .unwrap();
-    let target = project
-        .add_element(Kind::Function, Layer::Sa, "Receive", None)
-        .unwrap();
-    let retained = project.relate(RelationKind::Allocation, "Performs send", performer, source);
-    project.relate(
-        RelationKind::Allocation,
-        "Performs receive",
-        receiver,
-        target,
-    );
-    let functional_exchange = project.relate(
-        RelationKind::FunctionalExchange,
-        "Information",
-        source,
-        target,
-    );
-    let (output, input) = match project.relations[&functional_exchange].body {
-        RelationBody::FunctionalExchange {
-            source_port,
-            target_port,
-            ..
-        } => (source_port, target_port),
-        _ => unreachable!(),
-    };
-    let mut component_ports = vec![];
-    for (owner, name) in [
-        (performer, "First component port"),
-        (receiver, "Second component port"),
-    ] {
-        let id = Id::new_v4();
-        let port = make_port(
-            &project,
-            id,
-            owner,
-            name,
-            PortContract::Component {
-                kind: ComponentPortKind::Flow,
-                orientation: ComponentPortOrientation::InOut,
-            },
-        )
-        .unwrap();
-        project.elements.insert(id, port);
-        component_ports.push(id);
-    }
-    let [a, b] = [component_ports[0], component_ports[1]];
-    let boundary = relation(
-        &mut project,
-        300,
-        "boundary",
-        RelationBody::BoundaryExchange {
-            source: a,
-            target: b,
-            oriented: false,
-            items: vec![],
-        },
-    );
-    // Either endpoint allocation is required. Their overlapping conditional
-    // cascade must remove the exchange allocation once, after one whole batch.
-    let numbers = if reverse_ids { [200, 100] } else { [100, 200] };
-    let first = relation(
-        &mut project,
-        numbers[0],
-        "first_output",
-        RelationBody::PortAllocation {
-            source: a,
-            target: output,
-        },
-    );
-    let second = relation(
-        &mut project,
-        numbers[1],
-        "second_input",
-        RelationBody::PortAllocation {
-            source: b,
-            target: input,
-        },
-    );
-    if invalid_dual_mapping {
-        // Two simultaneous direct/reverse mappings would need the same actual
-        // performer at both ends, violating the different-boundary-owners rule.
-        relation(
-            &mut project,
-            400,
-            "first_input",
-            RelationBody::PortAllocation {
-                source: a,
-                target: input,
-            },
-        );
-        relation(
-            &mut project,
-            500,
-            "second_output",
-            RelationBody::PortAllocation {
-                source: b,
-                target: output,
-            },
-        );
-    }
-    let exchange_allocation = relation(
-        &mut project,
-        150,
-        "realizes_exchange",
-        RelationBody::ExchangeAllocation {
-            source: boundary,
-            target: functional_exchange,
-        },
-    );
-    let diagram = project.ensure_diagram(Layer::Sa);
-    project.diagrams.get_mut(&diagram).unwrap().projection = ProjectionKind::Overview;
-    for (element, x) in [
-        (performer, 40.),
-        (receiver, 1360.),
-        (source, 480.),
-        (target, 920.),
-    ] {
-        project.place(diagram, element, Position { x, y: 200. });
-    }
-    project.diagrams.get_mut(&diagram).unwrap().routes = [first, retained]
-        .into_iter()
-        .map(|edge| EdgeRoute {
-            edge,
-            source_attachment: None,
-            target_attachment: None,
-            waypoints: vec![Position { x: 360., y: 350. }],
-            label: None,
-        })
-        .collect();
-    Fixture {
-        project,
-        diagram,
-        selected_allocations: [first, second],
-        exchange_allocation,
-        functional_exchange,
-    }
-}
-
-#[test]
-fn overlapping_conditional_allocation_loss_is_reviewed_from_final_candidate() {
-    for reverse_ids in [false, true] {
-        let f = fixture(reverse_ids, false);
-        validate_candidate(&f.project)
-            .expect("Separate actual performers and required endpoint mappings are valid");
-        for selected in f.selected_allocations {
-            assert!(
-                references::deletion_impact(&f.project, selected).contains(&f.exchange_allocation),
-                "Both selected allocations overlap on the same conditional dependent"
-            );
-            let singleton = execute_batch(&f.project, &[Command::Delete(selected)]).unwrap();
-            assert!(!singleton.relations.contains_key(&f.exchange_allocation));
-        }
-        let targets = f.selected_allocations.map(Target::Edge);
-        let plan = prepare(&f.project, f.diagram, &targets).unwrap();
-        let reversed = prepare(
-            &f.project,
-            f.diagram,
-            &[targets[1].clone(), targets[0].clone()],
-        )
-        .unwrap();
-        assert_eq!(
-            serde_json::to_value(&plan.command).unwrap(),
-            serde_json::to_value(&reversed.command).unwrap(),
-            "Click order must not change normalization"
-        );
-        let removed = BTreeSet::from([
-            f.selected_allocations[0],
-            f.selected_allocations[1],
-            f.exchange_allocation,
-        ]);
-        assert_eq!(plan.selected, BTreeSet::from(f.selected_allocations));
-        assert_eq!(plan.removed, removed);
-        assert_eq!(plan.changed, BTreeSet::from([f.diagram]));
-        // Literal record oracle, independent of deletion_impact / planner output.
-        let mut expected = f.project.clone();
-        for id in removed {
-            expected.relations.remove(&id);
-        }
-        expected
-            .diagrams
-            .get_mut(&f.diagram)
-            .unwrap()
-            .routes
-            .remove(0);
-        let actual = execute_batch(&f.project, &[plan.command]).unwrap();
-        assert_eq!(
-            actual, expected,
-            "Only two port allocations, their conditional exchange allocation and the deleted edge's authored route change"
-        );
-    }
-}
-
-#[test]
-fn direct_exchange_cascade_and_conditional_support_loss_share_one_batch() {
-    for reverse_ids in [false, true] {
-        let f = fixture(reverse_ids, false);
-        validate_candidate(&f.project)
-            .expect("Separate actual performers and required endpoint mappings are valid");
-        let targets = [
-            Target::Edge(f.selected_allocations[0]),
-            Target::Edge(f.functional_exchange),
-            Target::Edge(f.selected_allocations[1]),
-        ];
-        let plan = prepare(&f.project, f.diagram, &targets).unwrap();
-        let removed = BTreeSet::from([
-            f.selected_allocations[0],
-            f.selected_allocations[1],
-            f.functional_exchange,
-            f.exchange_allocation,
-        ]);
-        assert_eq!(
-            plan.selected,
-            BTreeSet::from([
-                f.selected_allocations[0],
-                f.selected_allocations[1],
-                f.functional_exchange
-            ])
-        );
-        assert_eq!(plan.removed, removed);
-        assert_eq!(plan.changed, BTreeSet::from([f.diagram]));
-        let mut expected = f.project.clone();
-        for id in removed {
-            expected.relations.remove(&id);
-        }
-        expected
-            .diagrams
-            .get_mut(&f.diagram)
-            .unwrap()
-            .routes
-            .remove(0);
-        assert_eq!(
-            execute_batch(&f.project, &[plan.command]).unwrap(),
-            expected
-        );
-    }
-}
-
-#[test]
-fn alternative_pairing_counterexample_is_not_a_valid_saved_model() {
-    let f = fixture(false, true);
-    assert!(validation::validate(&f.project).iter().any(
-        |issue| issue.code == "boundary_owner" && issue.severity == validation::Severity::Error
-    ));
-    let before = f.project.clone();
-    assert!(
-        prepare(
-            &f.project,
-            f.diagram,
-            &f.selected_allocations.map(Target::Edge)
-        )
-        .is_err()
-    );
-    assert_eq!(f.project, before);
-}

crates/oa-desktop/src/diagram/lifecycle_tests.rs

@@ -53,7 +53,6 @@ fn bounds() -> Rectangle {
 }
 fn canvas(app: &App) -> DiagramCanvas<'_> {
     DiagramCanvas {
-        removal_input: &app.saved_removal_input,
         selection: None,
         project: app.project(),
         view_index: None,

crates/oa-desktop/src/diagram/multiselect.rs

@@ -178,25 +178,10 @@ impl DiagramCanvas<'_> {
             }
             if selection.targets().len() > 1 && *key == Key::Named(Named::Delete) {
                 let snapshot = selection.snapshot(context(self.context))?;
-                if *modifiers == iced::keyboard::Modifiers::SHIFT {
-                    let Some(input_generation) = self.removal_input.idle() else {
-                        return Some(Action::capture());
-                    };
-                    return Some(
-                        Action::publish(Message::SavedRemoval(Box::new(
-                            crate::app::saved_removal::Event::Begin {
-                                input_generation,
-                                context: self.context,
-                                snapshot: Box::new(snapshot),
-                            },
-                        )))
-                        .and_capture(),
-                    );
-                }
                 let action = if modifiers.is_empty() {
                     Event::Hide(snapshot)
                 } else {
-                    Event::Refuse(snapshot, "Use plain Delete to hide placements or Shift+Delete to review deletion from the model.".into())
+                    Event::Refuse(snapshot, "Use Hide selected to remove placements. Group model-deletion review is not available yet.".into())
                 };
                 return Some(Action::publish(Message::DiagramSelection(action)).and_capture());
             }

crates/oa-desktop/src/diagram/multiselect_tests.rs

@@ -18,7 +18,6 @@ fn bounds() -> Rectangle {
 }
 
 struct Fixture {
-    removal_input: crate::removal_input::Lifetime,
     project: Project,
     diagram: Id,
     a: Id,
@@ -71,7 +70,6 @@ impl Fixture {
         .collect();
         validate_candidate(&project).unwrap();
         Self {
-            removal_input: Default::default(),
             project,
             diagram,
             a,
@@ -107,7 +105,6 @@ impl Fixture {
             _ => self.diagram,
         };
         DiagramCanvas {
-            removal_input: &self.removal_input,
             selection: Some(selection),
             project: &self.project,
             view_index: None,

crates/oa-desktop/src/diagram/pointer_tests.rs

@@ -61,7 +61,6 @@ fn screen(p: Position, zoom: f32) -> Point {
 }
 fn canvas(app: &App, zoom: f32) -> DiagramCanvas<'_> {
     DiagramCanvas {
-        removal_input: &app.saved_removal_input,
         selection: None,
         project: app.project(),
         view_index: None,

crates/oa-desktop/src/diagram/port_hit_tests.rs

@@ -1,13 +1,7 @@
 use super::*;
 
-fn canvas<'a>(
-    project: &'a Project,
-    diagram: Id,
-    zoom: f32,
-    removal_input: &'a crate::removal_input::Lifetime,
-) -> DiagramCanvas<'a> {
+fn canvas(project: &Project, diagram: Id, zoom: f32) -> DiagramCanvas<'_> {
     DiagramCanvas {
-        removal_input,
         selection: None,
         project,
         view_index: None,
@@ -64,8 +58,7 @@ fn nearest_port_center_wins_on_all_borders_and_zoom_levels() {
             ..Default::default()
         };
         for zoom in [0.0001, 0.35, 1., 3.] {
-            let removal_input = crate::removal_input::Lifetime::default();
-            let canvas = canvas(&project, diagram, zoom, &removal_input);
+            let canvas = canvas(&project, diagram, zoom);
             for _ in 0..2 {
                 for port in &view.ports {
                     assert_eq!(
@@ -98,8 +91,7 @@ fn coincident_ports_keep_selection_then_use_stable_identity() {
             .collect(),
         ..Default::default()
     };
-    let removal_input = crate::removal_input::Lifetime::default();
-    let mut canvas = canvas(&project, diagram, 0.35, &removal_input);
+    let mut canvas = canvas(&project, diagram, 0.35);
     let at = local(&canvas, view.ports[0].position);
     for _ in 0..2 {
         canvas.selected = Id::nil();
@@ -155,8 +147,7 @@ fn nested_owner_palette_selection_drag_and_context_menu_pick_the_same_port() {
         })
         .collect();
     validate_candidate(&project).unwrap();
-    let removal_input = crate::removal_input::Lifetime::default();
-    let canvas = canvas(&project, diagram, 0.35, &removal_input);
+    let canvas = canvas(&project, diagram, 0.35);
     let view = project_view(&project, diagram);
     let bounds = Rectangle::new(Point::new(200., 80.), Size::new(800., 600.));
     for port in &view.ports {

crates/oa-desktop/src/diagram/port_labels.rs

@@ -177,7 +177,6 @@ mod tests {
 
     fn program(app: &App) -> PortLabels<'_> {
         PortLabels(DiagramCanvas {
-            removal_input: &app.saved_removal_input,
             selection: None,
             project: app.project(),
             view_index: None,

crates/oa-desktop/src/diagram/work_drag.rs

@@ -243,6 +243,21 @@ impl canvas::Program<Message> for WorkFeedback<'_> {
         let Some(frozen) = &feedback.frozen else {
             return vec![];
         };
+        if let Some(delta) = feedback.ghost_delta {
+            for region in &frozen.moving {
+                let top = Point::new(
+                    (region.x + delta.x) * self.0.zoom + self.0.pan.x,
+                    (region.y + delta.y) * self.0.zoom + self.0.pan.y,
+                );
+                frame.stroke(
+                    &Path::rectangle(
+                        top,
+                        iced::Size::new(region.width * self.0.zoom, region.height * self.0.zoom),
+                    ),
+                    Stroke::default().with_color(color).with_width(2.),
+                );
+            }
+        }
         for index in &feedback.targets {
             let target = &frozen.targets[*index];
             let region = target.region;

crates/oa-desktop/src/diagram_selection.rs

@@ -184,10 +184,6 @@ impl Selection {
 }
 
 impl Snapshot {
-    pub(crate) fn generation(&self) -> u64 {
-        self.generation
-    }
-
     pub fn context(&self) -> Context {
         self.context
     }

crates/oa-desktop/src/main.rs

@@ -26,8 +26,6 @@ mod port_edit;
 mod port_preview;
 mod port_workflow;
 mod recovery;
-mod removal_effects;
-mod removal_input;
 mod route_edit;
 mod semantic_review;
 mod source_annotations;

crates/oa-desktop/src/model_menu.rs

@@ -19,7 +19,6 @@ pub struct Request {
     pub creation_point: Option<Position>,
     pub canvas: Option<route_edit::Context>,
     pub process: Option<Box<crate::behavior::topology::Context>>,
-    pub scenario: Option<Box<crate::behavior::scenario::Context>>,
     pub source_file: Option<String>,
 }
 impl Request {
@@ -35,7 +34,6 @@ impl Request {
             creation_point: None,
             canvas: None,
             process: None,
-            scenario: None,
             source_file: None,
         }
     }
@@ -57,7 +55,6 @@ pub struct Opened {
     page: Page,
     layer: Layer,
     diagram: Option<Id>,
-    scenario_selection: Option<crate::diagram_selection::Snapshot>,
 }
 impl Opened {
     pub fn new(app: &App, request: Request, token: u64) -> Option<Self> {
@@ -70,24 +67,9 @@ impl Opened {
                 .process
                 .as_deref()
                 .is_some_and(|c| Some(*c) != app.topology_context())
-            || request
-                .scenario
-                .as_deref()
-                .is_some_and(|c| Some(*c) != app.scenario_context())
         {
             return None;
         }
-        let scenario_selection = if request.scenario.is_some()
-            || request.process.is_some()
-            || (request.canvas.is_some()
-                && app
-                    .multiselect_snapshot()
-                    .is_some_and(|s| s.targets().len() > 1))
-        {
-            Some(app.multiselect_snapshot()?)
-        } else {
-            None
-        };
         Some(Self {
             token,
             request,
@@ -97,7 +79,6 @@ impl Opened {
             page: app.page,
             layer: app.layer,
             diagram: current_diagram(app),
-            scenario_selection,
         })
     }
     pub fn valid(&self, app: &App) -> bool {
@@ -118,15 +99,6 @@ impl Opened {
                 .process
                 .as_deref()
                 .is_none_or(|c| Some(*c) == app.topology_context())
-            && self
-                .request
-                .scenario
-                .as_deref()
-                .is_none_or(|c| Some(*c) == app.scenario_context())
-            && self
-                .scenario_selection
-                .as_ref()
-                .is_none_or(|captured| app.multiselect_snapshot().as_ref() == Some(captured))
             && self
                 .request
                 .source_file
@@ -137,19 +109,9 @@ impl Opened {
 
 fn target_matches(app: &App, request: &Request) -> bool {
     use crate::diagram_usage::Target;
-    if request.scenario.is_some()
-        && (request.canvas.is_some() || request.process.is_some() || request.placement.is_some())
-    {
-        return false;
-    }
     let Some(target) = request.selection_target.as_deref() else {
         return true;
     };
-    if let Some(context) = request.scenario.as_deref() {
-        return Some(*context) == app.scenario_context()
-            && matches!(target, Target::ScenarioObject(id) if *id == request.object)
-            && app.multiselect_target_visible(target);
-    }
     if (request.canvas.is_none() && request.process.is_none())
         || !app.multiselect_target_visible(target)
     {
@@ -197,17 +159,6 @@ fn current_diagram(app: &App) -> Option<Id> {
     if app.page == Page::Behavior {
         app.topology_context()
             .map(|context| context.owner)
-            .or_else(|| {
-                app.scenario_context()
-                    .map(|context| match context.representation {
-                        crate::behavior::scenario_layout::Representation::Derived { owner } => {
-                            owner
-                        }
-                        crate::behavior::scenario_layout::Representation::Saved { diagram } => {
-                            diagram
-                        }
-                    })
-            })
             .or_else(|| app.state_context().map(|context| context.diagram))
     } else {
         app.active_diagram
@@ -221,56 +172,49 @@ pub fn open(object: Id, anchor: Point) -> Message {
 pub fn trigger(app: &App) -> iced::Element<'_, Message> {
     crate::context_menu::Area::left(
         crate::views::action("Actions ▾", Message::Menu(Event::Close)),
-        move |anchor| Message::Menu(Event::Open(actions_request(app, anchor))),
+        move |anchor| {
+            let mut request = Request::object(app.selected, anchor);
+            if app.page == Page::Diagram {
+                request.placement = app.selected_node;
+                request.bend = app
+                    .selected_bend
+                    .filter(|(id, _)| *id == app.selected)
+                    .map(|(_, i)| i);
+                request.canvas = app.route_context();
+            } else if app.page == Page::Behavior {
+                request.canvas = app.state_context();
+                request.process = app.topology_context().map(Box::new);
+                if let Some(target) = app.diagram_selection.as_ref().and_then(|s| s.primary()) {
+                    request.selection_target = Some(Box::new(target.clone()));
+                    request.placement = match target {
+                        crate::diagram_usage::Target::Placement(id) => {
+                            if let Some(node) = request
+                                .canvas
+                                .and_then(|c| app.project().diagrams.get(&c.diagram))
+                                .and_then(|d| d.nodes.get(id))
+                            {
+                                request.object = node.element;
+                            }
+                            Some(*id)
+                        }
+                        _ => None,
+                    };
+                } else if let Some(context) = request.canvas
+                    && let Some(node) = app.project().diagrams[&context.diagram]
+                        .nodes
+                        .values()
+                        .find(|node| node.element == app.selected || node.id == app.selected)
+                {
+                    request.object = node.element;
+                    request.placement = Some(node.id);
+                }
+            }
+            Message::Menu(Event::Open(request))
+        },
     )
     .into()
 }
 
-fn actions_request(app: &App, anchor: Point) -> Request {
-    let mut request = Request::object(app.selected, anchor);
-    if app.page == Page::Diagram {
-        request.placement = app.selected_node;
-        request.bend = app
-            .selected_bend
-            .filter(|(id, _)| *id == app.selected)
-            .map(|(_, i)| i);
-        request.canvas = app.route_context();
-    } else if app.page == Page::Behavior {
-        request.canvas = app.state_context();
-        request.process = app.topology_context().map(Box::new);
-        request.scenario = app.scenario_context().map(Box::new);
-        if let Some(target) = app.diagram_selection.as_ref().and_then(|s| s.primary()) {
-            request.selection_target = Some(Box::new(target.clone()));
-            request.placement = match target {
-                crate::diagram_usage::Target::Placement(id) => {
-                    if let Some(node) = request
-                        .canvas
-                        .and_then(|c| app.project().diagrams.get(&c.diagram))
-                        .and_then(|d| d.nodes.get(id))
-                    {
-                        request.object = node.element;
-                    }
-                    Some(*id)
-                }
-                crate::diagram_usage::Target::ScenarioObject(id) => {
-                    request.object = *id;
-                    None
-                }
-                _ => None,
-            };
-        } else if let Some(context) = request.canvas
-            && let Some(node) = app.project().diagrams[&context.diagram]
-                .nodes
-                .values()
-                .find(|node| node.element == app.selected || node.id == app.selected)
-        {
-            request.object = node.element;
-            request.placement = Some(node.id);
-        }
-    }
-    request
-}
-
 pub fn popup(app: &App) -> Option<Menu<Message>> {
     let opened = app.model_menu.as_ref().filter(|menu| menu.valid(app))?;
     let request = &opened.request;
@@ -317,78 +261,6 @@ pub fn popup(app: &App) -> Option<Menu<Message>> {
         });
     }
     let mut entries = vec![Entry::title(crate::views::short(p.named(id), 38))];
-    if let Some(context) = request.scenario.as_deref().copied() {
-        use crate::app::multiselect::Choice;
-        use crate::behavior::scenario::{CanvasEvent, selection};
-        let snapshot = opened.scenario_selection.as_ref()?;
-        let selection_message = |intent| {
-            Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(selection::Event {
-                context,
-                snapshot: snapshot.clone(),
-                intent,
-            })))
-        };
-        if let Some(target) = request.selection_target.as_deref() {
-            let selected = snapshot.targets().contains(target);
-            entries.push(item(
-                if selected {
-                    "Remove from selection"
-                } else {
-                    "Add to selection"
-                },
-                selection_message(selection::Intent::Choose(
-                    target.clone(),
-                    if selected {
-                        Choice::Remove
-                    } else {
-                        Choice::Add
-                    },
-                )),
-                true,
-            ));
-            if snapshot.targets().len() > 1 {
-                if selected {
-                    entries.push(item(
-                        "Inspect this element",
-                        selection_message(selection::Intent::Choose(
-                            target.clone(),
-                            Choice::Inspect,
-                        )),
-                        true,
-                    ));
-                }
-                entries.push(item(
-                    "Select only this element",
-                    selection_message(selection::Intent::Choose(target.clone(), Choice::Replace)),
-                    true,
-                ));
-            }
-            entries.push(Entry::separator());
-        }
-        // A menu on an unselected subject must not expose singleton model actions
-        // while the canvas still depicts a group. Selection changes are explicit.
-        if snapshot.targets().len() > 1 {
-            entries.push(Entry::title(format!(
-                "{} selected",
-                snapshot.targets().len()
-            )));
-            entries.push(Entry::title(
-                "Use Reorder above the canvas to change sequence order",
-            ));
-            if let Some(removal) = crate::app::scenario_removal::begin(app) {
-                entries.push(item("Remove selected from Scenario…", removal, true));
-            }
-            entries.push(Entry::title(
-                "Select one occurrence for its individual actions",
-            ));
-            return Some(Menu {
-                token: opened.token,
-                anchor: request.anchor,
-                entries,
-                on_close: Message::Menu(Event::Close),
-            });
-        }
-    }
     if (request.canvas.is_some() || request.process.is_some())
         && let Some(context) = app.multiselect_context()
     {
@@ -442,50 +314,22 @@ pub fn popup(app: &App) -> Option<Menu<Message>> {
                 )),
                 true,
             ));
-            // Navigation belongs to the exact clicked preview, even when it
-            // is outside the current group. Keep it alongside aggregate removal
-            // without selecting that preview or exposing singleton mutations.
-            let qualified_definition = request.process.as_deref().copied().and_then(|context| {
-                let endpoint = match request.selection_target.as_deref() {
-                    Some(Target::ProcessOccurrence(endpoint))
-                        if !endpoint.references.is_empty() =>
-                    {
-                        Some(endpoint.clone())
-                    }
-                    Some(Target::ProcessPreviewLink { source, .. }) => Some(source.clone()),
-                    _ => None,
-                }?;
-                Some((context, endpoint))
-            });
-            if let Some((context, endpoint)) = &qualified_definition {
-                entries.push(Entry::title("Reused contents · read-only in this process"));
-                entries.push(item(
-                    "Open referenced definition",
-                    Message::TopologyCanvas(crate::behavior::topology::CanvasEvent::OpenQualified(
-                        *context,
-                        endpoint.clone(),
-                    )),
-                    true,
-                ));
-            }
             if let Some(snapshot) = app.multiselect_snapshot().filter(|s| s.targets().len() > 1)
-                && (selected || request.process.is_some() || request.canvas.is_some())
+                && selected
             {
                 entries.push(Entry::title(format!(
                     "{} selected",
                     snapshot.targets().len()
                 )));
-                if selected {
-                    entries.push(item(
-                        "Inspect this element",
-                        Message::DiagramSelection(SelectionEvent::Choose(
-                            context,
-                            target.clone(),
-                            Choice::Inspect,
-                        )),
-                        true,
-                    ));
-                }
+                entries.push(item(
+                    "Inspect this element",
+                    Message::DiagramSelection(SelectionEvent::Choose(
+                        context,
+                        target.clone(),
+                        Choice::Inspect,
+                    )),
+                    true,
+                ));
                 entries.push(item(
                     "Select only this element",
                     Message::DiagramSelection(SelectionEvent::Choose(
@@ -499,13 +343,9 @@ pub fn popup(app: &App) -> Option<Menu<Message>> {
                     entries.push(Entry::title(
                         "Drag contributions within one column to reorder",
                     ));
-                    if let Some(removal) = crate::app::process_removal::begin(app) {
-                        entries.push(item(
-                            "Remove selected contributions / links…",
-                            removal,
-                            true,
-                        ));
-                    }
+                    entries.push(Entry::disabled(
+                        "Hide unavailable · cards are model contributions",
+                    ));
                 } else {
                     entries.push(item(
                         "Hide selected placements",
@@ -513,11 +353,9 @@ pub fn popup(app: &App) -> Option<Menu<Message>> {
                         crate::app::multiselect::placements(&snapshot).is_some(),
                     ));
                 }
-                if request.process.is_none()
-                    && let Some(removal) = crate::app::saved_removal::begin(app)
-                {
-                    entries.push(item("Delete selected from model…", removal, true));
-                }
+                entries.push(Entry::disabled(
+                    "Delete selected from model (not yet available)",
+                ));
                 return Some(Menu {
                     token: opened.token,
                     anchor: request.anchor,
@@ -526,13 +364,34 @@ pub fn popup(app: &App) -> Option<Menu<Message>> {
                 });
             }
             entries.push(Entry::separator());
-            if qualified_definition.is_some() {
-                return Some(Menu {
-                    token: opened.token,
-                    anchor: request.anchor,
-                    entries,
-                    on_close: Message::Menu(Event::Close),
-                });
+            if let Some(context) = request.process.as_deref().copied() {
+                let endpoint = match request.selection_target.as_deref() {
+                    Some(Target::ProcessOccurrence(endpoint))
+                        if !endpoint.references.is_empty() =>
+                    {
+                        Some(endpoint.clone())
+                    }
+                    Some(Target::ProcessPreviewLink { source, .. }) => Some(source.clone()),
+                    _ => None,
+                };
+                if let Some(endpoint) = endpoint {
+                    entries.push(Entry::title("Reused contents · read-only in this process"));
+                    entries.push(item(
+                        "Open referenced definition",
+                        Message::TopologyCanvas(
+                            crate::behavior::topology::CanvasEvent::OpenQualified(
+                                context, endpoint,
+                            ),
+                        ),
+                        true,
+                    ));
+                    return Some(Menu {
+                        token: opened.token,
+                        anchor: request.anchor,
+                        entries,
+                        on_close: Message::Menu(Event::Close),
+                    });
+                }
             }
         }
     }
@@ -939,10 +798,6 @@ fn relation_actions(kind: Kind) -> &'static [(&'static str, RelationKind, bool)]
     }
 }
 
-#[cfg(test)]
-#[path = "model_menu_scenario_tests.rs"]
-mod scenario_tests;
-
 #[cfg(test)]
 mod tests {
     use super::*;

crates/oa-desktop/src/model_menu_scenario_tests.rs

@@ -1,319 +0,0 @@
-use super::*;
-use crate::{
-    app::multiselect::Choice,
-    behavior::scenario::{CanvasEvent, Context, selection},
-    behavior::scenario_layout::Representation,
-    diagram_usage::Target,
-};
-
-fn saved(project: &mut Project, owner: Id, name: &str) -> Id {
-    let id = Id::new_v4();
-    project.diagrams.insert(
-        id,
-        Diagram {
-            id,
-            alias: format!("scenario_menu_view_{}", project.diagrams.len()),
-            name: name.into(),
-            description: String::new(),
-            layer: Layer::Oa,
-            projection: ProjectionKind::Scenario { scenario: owner },
-            layout: None,
-            routes: vec![],
-            nodes: Default::default(),
-            view_options: Default::default(),
-        },
-    );
-    id
-}
-
-fn fixture() -> (App, [Id; 3], Id, [Id; 2]) {
-    let (mut project, [owner, _, _], [first, second, hidden]) =
-        crate::behavior::scenario::direct_tests::navigation_fixture();
-    let mut third = project.elements[&first].clone();
-    third.id = Id::new_v4();
-    third.alias = "third_menu_reference".into();
-    third.name = "Third reference".into();
-    let third_id = third.id;
-    project = execute_batch(&project, &[Command::CreateElement(third)]).unwrap();
-    let views = [
-        saved(&mut project, owner, "A"),
-        saved(&mut project, owner, "B"),
-    ];
-    let mut app = App::with_project(project);
-    send(&mut app, Message::Select(owner));
-    send(&mut app, Message::Page(Page::Behavior));
-    (app, [first, second, third_id], hidden, views)
-}
-
-fn send(app: &mut App, message: Message) {
-    let _ = app.update(message);
-}
-
-fn choose(app: &mut App, id: Id, choice: Choice) {
-    let event = selection::Event {
-        context: app.scenario_context().unwrap(),
-        snapshot: app.multiselect_snapshot().unwrap(),
-        intent: selection::Intent::Choose(Target::ScenarioObject(id), choice),
-    };
-    send(
-        app,
-        Message::ScenarioCanvas(CanvasEvent::Selection(Box::new(event))),
-    );
-}
-
-fn request(app: &App, id: Id) -> Request {
-    let mut request = Request::object(id, Point::new(120., 80.));
-    request.scenario = app.scenario_context().map(Box::new);
-    request.selection_target = Some(Box::new(Target::ScenarioObject(id)));
-    request
-}
-
-fn action(app: &App, caption: &str) -> Message {
-    popup(app)
-        .unwrap()
-        .entries
-        .into_iter()
-        .find_map(|entry| match entry {
-            Entry::Action { label, message, .. } if label == caption => message,
-            _ => None,
-        })
-        .unwrap_or_else(|| panic!("Expected enabled Scenario menu action {caption}"))
-}
-
-#[test]
-fn scenario_requests_require_exact_visible_target_and_complete_exclusive_context() {
-    let (mut app, [first, second, _], hidden, [view, _]) = fixture();
-    choose(&mut app, first, Choice::Replace);
-    let valid = request(&app, first);
-    assert!(Opened::new(&app, valid.clone(), 1).is_some());
-    let current = app.scenario_context().unwrap();
-    for captured in [
-        Context {
-            document: Id::new_v4(),
-            ..current
-        },
-        Context {
-            scenario: Id::new_v4(),
-            ..current
-        },
-        Context {
-            representation: Representation::Saved { diagram: view },
-            ..current
-        },
-        Context {
-            visit: Id::new_v4(),
-            ..current
-        },
-        Context {
-            revision: current.revision + 1,
-            ..current
-        },
-        Context {
-            epoch: current.epoch + 1,
-            ..current
-        },
-    ] {
-        let mut stale = valid.clone();
-        stale.scenario = Some(Box::new(captured));
-        assert!(Opened::new(&app, stale, 2).is_none());
-    }
-    let mut wrong = valid.clone();
-    wrong.object = second;
-    assert!(Opened::new(&app, wrong, 2).is_none());
-    assert!(app.project().contains(hidden));
-    assert!(!app.multiselect_target_visible(&Target::ScenarioObject(hidden)));
-    assert!(Opened::new(&app, request(&app, hidden), 2).is_none());
-    let mut wrong = valid.clone();
-    wrong.placement = Some(Id::new_v4());
-    assert!(Opened::new(&app, wrong, 2).is_none());
-    let mut wrong = valid.clone();
-    wrong.canvas = Some(route_edit::Context {
-        document: current.document,
-        diagram: view,
-        revision: current.revision,
-        epoch: current.epoch,
-    });
-    assert!(Opened::new(&app, wrong, 2).is_none());
-    let mut wrong = valid.clone();
-    wrong.process = Some(Box::new(crate::behavior::topology::Context {
-        document: current.document,
-        owner: current.scenario,
-        revision: current.revision,
-        epoch: current.epoch,
-    }));
-    assert!(Opened::new(&app, wrong, 2).is_none());
-    let mut wrong = valid.clone();
-    wrong.selection_target = Some(Box::new(Target::Edge(first)));
-    assert!(Opened::new(&app, wrong, 2).is_none());
-    let mut wrong = valid;
-    wrong.scenario = None;
-    assert!(Opened::new(&app, wrong, 2).is_none());
-}
-
-#[test]
-fn scenario_menu_rejects_saved_visit_roundtrip_even_with_equal_generic_snapshot() {
-    let (mut app, [first, second, _], _, [a, b]) = fixture();
-    let switch = |app: &mut App, diagram| {
-        let context = app.scenario_context().unwrap();
-        send(
-            app,
-            Message::ScenarioCanvas(CanvasEvent::Representation(
-                context,
-                Representation::Saved { diagram },
-            )),
-        );
-    };
-    switch(&mut app, a);
-    choose(&mut app, first, Choice::Replace);
-    choose(&mut app, second, Choice::Add);
-    let opened = Opened::new(&app, request(&app, first), 1).unwrap();
-    let old_context = app.scenario_context().unwrap();
-    let before = app.document.snapshot();
-    let selected = app.diagram_selection.take().unwrap();
-    switch(&mut app, b);
-    assert!(!opened.valid(&app));
-    switch(&mut app, a);
-    assert_ne!(app.scenario_context().unwrap().visit, old_context.visit);
-    // Restore the same shared selection and epoch deliberately. Only the full
-    // Scenario visit may distinguish the old request from this returned view.
-    app.canvas_epoch = old_context.epoch;
-    app.diagram_selection = Some(selected);
-    app.selected = second;
-    assert_eq!(app.multiselect_snapshot(), opened.scenario_selection);
-    assert!(!opened.valid(&app));
-    assert!(Opened::new(&app, opened.request.clone(), 2).is_none());
-    assert!(std::sync::Arc::ptr_eq(&before, &app.document.snapshot()));
-}
-
-#[test]
-fn scenario_group_menus_capture_set_and_never_expose_partial_model_actions() {
-    let (mut app, [first, second, third], _, _) = fixture();
-    choose(&mut app, first, Choice::Replace);
-    choose(&mut app, second, Choice::Add);
-    let before = app.document.snapshot();
-    let capture = actions_request(&app, Point::ORIGIN);
-    assert_eq!(capture.object, second);
-    assert_eq!(
-        capture.selection_target.as_deref(),
-        Some(&Target::ScenarioObject(second))
-    );
-    assert_eq!(capture.scenario.as_deref().copied(), app.scenario_context());
-    assert!(capture.canvas.is_none() && capture.process.is_none() && capture.placement.is_none());
-
-    for target in [first, third] {
-        let captured_request = request(&app, target);
-        send(&mut app, Message::Menu(Event::Open(captured_request)));
-        let snapshot = app.multiselect_snapshot().unwrap();
-        let menu = popup(&app).unwrap();
-        assert!(
-            menu.entries
-                .iter()
-                .any(|e| matches!(e, Entry::Title(label) if label == "2 selected"))
-        );
-        let mut enabled = 0;
-        let mut removals = 0;
-        for entry in menu.entries {
-            match entry {
-                Entry::Action {
-                    label,
-                    message: Some(Message::Menu(Event::Invoke(_, message))),
-                    ..
-                } => {
-                    if let Message::ScenarioRemoval(event) = &*message {
-                        let crate::app::scenario_removal::Event::Begin {
-                            context,
-                            snapshot: captured,
-                        } = &**event
-                        else {
-                            panic!("Group menu must capture a fresh removal review");
-                        };
-                        assert_eq!(label, "Remove selected from Scenario…");
-                        assert_eq!(Some(*context), app.scenario_context());
-                        assert_eq!(captured.as_ref(), &snapshot);
-                        removals += 1;
-                        continue;
-                    }
-                    let Message::ScenarioCanvas(CanvasEvent::Selection(event)) = *message else {
-                        panic!("Scenario group menu exposed a singleton model action");
-                    };
-                    assert_eq!(event.context, app.scenario_context().unwrap());
-                    assert_eq!(event.snapshot, snapshot);
-                    let selection::Intent::Choose(actual_target, choice) = event.intent else {
-                        panic!("Unexpected group selection intent");
-                    };
-                    assert_eq!(actual_target, Target::ScenarioObject(target));
-                    assert!(matches!(
-                        (label.as_str(), choice),
-                        ("Add to selection", Choice::Add)
-                            | ("Remove from selection", Choice::Remove)
-                            | ("Inspect this element", Choice::Inspect)
-                            | ("Select only this element", Choice::Replace)
-                    ));
-                    enabled += 1;
-                }
-                Entry::Action {
-                    label,
-                    message: None,
-                    ..
-                } => {
-                    assert!(!label.contains("Hide"));
-                }
-                Entry::Action {
-                    message: Some(_), ..
-                } => panic!("Uncaptured menu action"),
-                _ => {}
-            }
-        }
-        assert_eq!(enabled, if target == first { 3 } else { 2 });
-        assert_eq!(removals, 1, "One captured whole-selection removal action");
-        assert_eq!(
-            app.diagram_selection.as_ref().unwrap().targets(),
-            &[
-                Target::ScenarioObject(first),
-                Target::ScenarioObject(second)
-            ]
-        );
-        assert_eq!(app.selected, second);
-    }
-    let selected_request = request(&app, first);
-    send(&mut app, Message::Menu(Event::Open(selected_request)));
-    let inspect = action(&app, "Inspect this element");
-    send(&mut app, inspect);
-    assert_eq!(app.selected, first);
-    assert_eq!(
-        app.diagram_selection.as_ref().unwrap().targets(),
-        &[
-            Target::ScenarioObject(first),
-            Target::ScenarioObject(second)
-        ]
-    );
-    let remove_request = request(&app, second);
-    send(&mut app, Message::Menu(Event::Open(remove_request)));
-    let remove = action(&app, "Remove from selection");
-    send(&mut app, remove);
-    assert_eq!(
-        app.diagram_selection.as_ref().unwrap().targets(),
-        &[Target::ScenarioObject(first)]
-    );
-    assert!(std::sync::Arc::ptr_eq(&before, &app.document.snapshot()));
-    assert_eq!(app.source_workspace.bundle(), before.bundle);
-}
-
-#[test]
-fn scenario_menu_snapshot_rejects_selection_aba_and_singleton_actions_stay_available() {
-    let (mut app, [first, second, _], _, _) = fixture();
-    choose(&mut app, first, Choice::Replace);
-    let captured = request(&app, first);
-    send(&mut app, Message::Menu(Event::Open(captured)));
-    let _ = action(&app, "Properties");
-    let _ = action(&app, "Delete from model…");
-    let opened = app.model_menu.take().unwrap();
-    let context = app.scenario_context();
-    // Isolate generation admission from the adapter's additional epoch defense.
-    let selected = app.diagram_selection.as_mut().unwrap();
-    selected.add(Target::ScenarioObject(second), |_| true);
-    selected.remove(&Target::ScenarioObject(second));
-    assert_eq!(app.scenario_context(), context);
-    assert_eq!(app.selected, first);
-    assert!(!opened.valid(&app));
-}

crates/oa-desktop/src/removal_effects.rs

@@ -1,230 +0,0 @@
-//! Definition-level Process/FunctionalChain effects of a complete removal candidate.
-//! Stored record differences and unchanged interpretation modes do not establish
-//! unchanged caller behavior. This bounded analysis does not expand reuse trees.
-use oa_core::topology_context::TopologyIndex;
-use oa_core::{Id, Kind, OccurrenceBody, Project, RelationKind, SharedBody};
-use std::collections::{BTreeMap, BTreeSet};
-
-#[derive(Debug)]
-pub(crate) struct DerivedEffects {
-    pub(crate) interpretation: Vec<InterpretationChange>,
-    /// Definitions whose records or authored topology changed, including deleted
-    /// definitions. Values identify surviving direct and transitive callers in
-    /// either project, even if their own stored records or modes did not change.
-    pub(crate) affected_uses: BTreeMap<Id, BTreeSet<Id>>,
-}
-#[derive(Clone, Debug, PartialEq, Eq)]
-pub(crate) struct InterpretationChange {
-    pub(crate) owner: Id,
-    pub(crate) before: Interpretation,
-    pub(crate) after: Interpretation,
-    pub(crate) callers: BTreeSet<Id>,
-}
-
-#[derive(Clone, Debug, PartialEq, Eq)]
-pub(crate) struct Interpretation {
-    /// None means explicit; Some includes the empty legacy order.
-    pub(crate) local_order: Option<Vec<Id>>,
-    /// Definition-level implicit order used within contextual expansion. This
-    /// does not claim complete expanded connectivity or boundary analysis.
-    pub(crate) expanded_order: Option<Vec<Id>>,
-    pub(crate) contextual_analysis: bool,
-}
-
-fn exchange(project: &Project, id: Id) -> bool {
-    matches!(
-        project.elements.get(&id).and_then(|e| e.shared()),
-        Some(SharedBody::Occurrence {
-            body: OccurrenceBody::Exchange { .. },
-            ..
-        })
-    )
-}
-
-fn interpretations(project: &Project) -> BTreeMap<Id, Interpretation> {
-    let index = TopologyIndex::new(project);
-    // This is exactly TopologyIndex::with_cache_capacity's relation ownership
-    // rule. Its link_definitions is private; do not expand repeated reuse trees
-    // just to answer this finite definition-level question.
-    let linked: BTreeSet<_> = project
-        .relations
-        .values()
-        .filter_map(|relation| {
-            relation.contextual_owner().or_else(|| {
-                (relation.kind() == RelationKind::SequenceLink)
-                    .then(|| {
-                        project
-                            .elements
-                            .get(&relation.source())
-                            .and_then(|e| e.parent)
-                    })
-                    .flatten()
-            })
-        })
-        .collect();
-    project
-        .elements
-        .values()
-        .filter(|e| matches!(e.kind(), Kind::Process | Kind::FunctionalChain))
-        .map(|e| {
-            let steps = e.steps().expect("Sequence definitions have ordered steps");
-            // All-exchange steps exclude every non-exchange explicit marker, so only
-            // local SequenceLinks remain to test (the desktop discriminator).
-            // legacy_order alone loses the explicit-versus-empty distinction.
-            let local_order = (!project.relations.values().any(|relation| {
-                relation.kind() == RelationKind::SequenceLink
-                    && project
-                        .elements
-                        .get(&relation.source())
-                        .and_then(|element| element.parent)
-                        == Some(e.id)
-                    && project
-                        .elements
-                        .get(&relation.target())
-                        .and_then(|element| element.parent)
-                        == Some(e.id)
-            }) && steps.iter().all(|id| exchange(project, *id)))
-            .then(|| steps.clone());
-            let children = index.contributions(e.id);
-            // Mirrors topology_context/analysis.rs Builder::expand's legacy-order
-            // discriminator: all indexed contributions (including unlisted ones),
-            // and neither SequenceLink nor ContextualLink definitions. Tests retain
-            // literal discriminators where this intentionally differs from desktop.
-            let expanded_order = (!linked.contains(&e.id)
-                && children.iter().all(|id| exchange(project, *id)))
-            .then_some(children);
-            (
-                e.id,
-                Interpretation {
-                    local_order,
-                    expanded_order,
-                    contextual_analysis: index.has_contextual_links(e.id),
-                },
-            )
-        })
-        .collect()
-}
-
-fn caller_edges(project: &Project, edges: &mut BTreeMap<Id, BTreeSet<Id>>) {
-    for element in project.elements.values() {
-        if let (
-            Some(parent),
-            Some(SharedBody::Occurrence {
-                body:
-                    OccurrenceBody::SequenceReference {
-                        sequence: Some(sequence),
-                    },
-                ..
-            }),
-        ) = (element.parent, element.shared())
-        {
-            edges.entry(*sequence).or_default().insert(parent);
-        }
-    }
-}
-
-fn callers(
-    owner: Id,
-    edges: &BTreeMap<Id, BTreeSet<Id>>,
-    surviving: &BTreeMap<Id, Interpretation>,
-) -> BTreeSet<Id> {
-    let mut seen = BTreeSet::from([owner]);
-    let mut pending = vec![owner];
-    while let Some(sequence) = pending.pop() {
-        for &caller in edges.get(&sequence).into_iter().flatten() {
-            if seen.insert(caller) {
-                pending.push(caller);
-            }
-        }
-    }
-    seen.remove(&owner);
-    seen.retain(|id| surviving.contains_key(id));
-    seen
-}
-
-fn definition_owner(project: &Project, id: Id) -> Option<Id> {
-    let owner = if let Some(element) = project.elements.get(&id) {
-        if matches!(element.kind(), Kind::Process | Kind::FunctionalChain) {
-            Some(id)
-        } else {
-            element.parent.filter(|_| {
-                matches!(
-                    element.shared(),
-                    Some(SharedBody::Occurrence {
-                        body: OccurrenceBody::Action { .. }
-                            | OccurrenceBody::Exchange { .. }
-                            | OccurrenceBody::Control { .. }
-                            | OccurrenceBody::SequenceReference { .. },
-                        ..
-                    })
-                )
-            })
-        }
-    } else {
-        project.relations.get(&id).and_then(|relation| {
-            relation.contextual_owner().or_else(|| {
-                (relation.kind() == RelationKind::SequenceLink)
-                    .then(|| {
-                        project
-                            .elements
-                            .get(&relation.source())
-                            .and_then(|e| e.parent)
-                    })
-                    .flatten()
-            })
-        })
-    }?;
-    project
-        .elements
-        .get(&owner)
-        .filter(|e| matches!(e.kind(), Kind::Process | Kind::FunctionalChain))
-        .map(|_| owner)
-}
-
-/// Analyze the actual accepted before/after projects and their complete record
-/// differences. Both graphs participate: deleting a definition can clear its
-/// surviving reference records, but must not erase their previous dependency.
-pub(crate) fn analyze(
-    project: &Project,
-    candidate: &Project,
-    removed: &BTreeSet<Id>,
-    changed: &BTreeSet<Id>,
-) -> DerivedEffects {
-    let before = interpretations(project);
-    let after = interpretations(candidate);
-    let mut edges = BTreeMap::new();
-    caller_edges(project, &mut edges);
-    caller_edges(candidate, &mut edges);
-    let affected_owners: BTreeSet<_> = removed
-        .iter()
-        .chain(changed)
-        .flat_map(|&id| {
-            [
-                definition_owner(project, id),
-                definition_owner(candidate, id),
-            ]
-            .into_iter()
-            .flatten()
-        })
-        .collect();
-    let affected_uses = affected_owners
-        .into_iter()
-        .map(|owner| (owner, callers(owner, &edges, &after)))
-        .collect();
-    let interpretation = after
-        .iter()
-        .filter_map(|(&owner, next)| {
-            let previous = before.get(&owner)?;
-            (previous != next).then(|| InterpretationChange {
-                owner,
-                before: previous.clone(),
-                after: next.clone(),
-                callers: callers(owner, &edges, &after),
-            })
-        })
-        .collect();
-    DerivedEffects {
-        interpretation,
-        affected_uses,
-    }
-}

crates/oa-desktop/src/removal_input.rs

@@ -1,132 +0,0 @@
-//! Transient pointer ownership shared by the canvas and its App adapter.
-//!
-//! Iced queues messages until the entire native event batch has reached widgets.
-//! A later press must therefore revoke an earlier removal packet synchronously,
-//! without relying on the ordering of two queued application messages.
-use std::sync::{
-    Arc,
-    atomic::{AtomicU64, Ordering},
-};
-
-#[derive(Clone, Default)]
-pub(crate) struct Lifetime(Arc<AtomicU64>);
-
-impl Lifetime {
-    /// Keep a retained canvas's private gesture ownership visible to App even
-    /// when its update returns early or emits no application message.
-    pub(crate) fn sync(&self, lease: &mut Option<Lease>, busy: bool) {
-        if !busy
-            || lease
-                .as_ref()
-                .is_some_and(|lease| !Arc::ptr_eq(&self.0, &lease.lifetime.0))
-        {
-            *lease = None;
-        }
-        if busy && lease.is_none() {
-            *lease = self.acquire();
-        }
-    }
-
-    pub(crate) fn observe(&self, event: &iced::widget::canvas::Event) {
-        use iced::{keyboard, mouse, widget::canvas, window};
-        let boundary = matches!(
-            event,
-            canvas::Event::Window(window::Event::Unfocused | window::Event::Resized(_))
-                | canvas::Event::Mouse(
-                    mouse::Event::ButtonPressed(_)
-                        | mouse::Event::WheelScrolled { .. }
-                        | mouse::Event::CursorLeft
-                )
-        ) || matches!(event, canvas::Event::Keyboard(keyboard::Event::KeyPressed { key, .. })
-            if *key != keyboard::Key::Named(keyboard::key::Named::Delete));
-        if boundary {
-            self.revoke_idle();
-        }
-    }
-
-    /// Even generations are idle; odd generations belong to one live gesture.
-    pub(crate) fn idle(&self) -> Option<u64> {
-        let generation = self.0.load(Ordering::SeqCst);
-        generation.is_multiple_of(2).then_some(generation)
-    }
-
-    /// Retire an idle packet at a native input boundary (including the
-    /// viewport's synthetic Unfocused event when it takes camera ownership).
-    pub(crate) fn revoke_idle(&self) {
-        if let Some(generation) = self.idle() {
-            // Keep overflow terminal and unavailable rather than reusing zero.
-            let next = generation.saturating_add(2);
-            let _ = self
-                .0
-                .compare_exchange(generation, next, Ordering::SeqCst, Ordering::SeqCst);
-        }
-    }
-
-    pub(crate) fn acquire(&self) -> Option<Lease> {
-        let generation = self.idle()?;
-        let active = generation.checked_add(1)?;
-        self.0
-            .compare_exchange(generation, active, Ordering::SeqCst, Ordering::SeqCst)
-            .ok()?;
-        Some(Lease {
-            lifetime: self.clone(),
-            active,
-        })
-    }
-}
-
-pub(crate) struct Lease {
-    lifetime: Lifetime,
-    active: u64,
-}
-
-impl Drop for Lease {
-    fn drop(&mut self) {
-        // A terminal odd generation stays unavailable on overflow. No stale
-        // packet can become valid again through counter wraparound.
-        if let Some(next) = self.active.checked_add(1) {
-            let _ = self.lifetime.0.compare_exchange(
-                self.active,
-                next,
-                Ordering::SeqCst,
-                Ordering::SeqCst,
-            );
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    #[test]
-    fn removal_input_lease_revokes_idle_capture_and_drop_never_reuses_it() {
-        let lifetime = Lifetime::default();
-        let captured = lifetime.idle().unwrap();
-        let clone = lifetime.clone();
-        let lease = clone.acquire().unwrap();
-        assert!(lifetime.idle().is_none());
-        assert!(lifetime.acquire().is_none());
-        drop(lease);
-        assert!(lifetime.idle().is_some());
-        assert_ne!(lifetime.idle(), Some(captured));
-        let after_drop = lifetime.idle();
-        lifetime.revoke_idle();
-        assert_ne!(lifetime.idle(), after_drop);
-    }
-
-    #[test]
-    fn removal_input_saturation_and_replaced_owner_cannot_reuse_a_packet() {
-        let terminal = Lifetime(Arc::new(AtomicU64::new(u64::MAX - 1)));
-        terminal.revoke_idle();
-        assert!(terminal.idle().is_none() && terminal.acquire().is_none());
-        let original = Lifetime::default();
-        let replacement = Lifetime::default();
-        let captured = original.idle();
-        let mut lease = original.acquire();
-        replacement.sync(&mut lease, true);
-        assert_ne!(original.idle(), captured);
-        assert!(replacement.idle().is_none());
-        drop(lease);
-        assert!(replacement.idle().is_some());
-    }
-}

crates/oa-desktop/src/views.rs

@@ -326,27 +326,6 @@ pub fn view(app: &App) -> View<'_, Message> {
         );
     }
     if let Some(target) = app.delete_target.as_ref().filter(|_| app.delete_pending) {
-        if target.saved.is_some() {
-            return modal_width(
-                root,
-                crate::app::saved_removal::view::view(app, target),
-                700.,
-            );
-        }
-        if target.process.is_some() {
-            return modal_width(
-                root,
-                crate::app::process_removal::view::view(app, target),
-                700.,
-            );
-        }
-        if target.scenario.is_some() {
-            return modal_width(
-                root,
-                crate::app::scenario_removal::view::view(app, target),
-                650.,
-            );
-        }
         return modal(
             root,
             column![
@@ -489,7 +468,6 @@ fn diagram(app: &App) -> View<'_, Message> {
     .align_y(iced::Center);
     let canvas: View<'_, Message> = if let Some(id) = app.active_diagram {
         let program = DiagramCanvas {
-            removal_input: &app.saved_removal_input,
             selection: app.diagram_selection.as_ref(),
             allocation: Some(app.allocation_capability()),
             project: app.project(),
@@ -682,25 +660,17 @@ fn diagram(app: &App) -> View<'_, Message> {
                     )),
                 ));
             }
-            selection_controls = selection_controls.push(
-                button(text("Delete from model…").size(12))
-                    .padding([6, 8])
-                    .on_press_maybe(
-                        crate::app::saved_removal::begin(app)
-                            .filter(|_| app.saved_removal_enabled()),
-                    ),
-            );
             selection_controls = selection_controls
                 .push(action(
-                    "Clear",
+                    "Clear selection",
                     Message::DiagramSelection(crate::app::multiselect::Event::Clear(
                         snapshot.context(),
                     )),
                 ))
                 .push(
                     label(format!(
-                        "Edit only {}",
-                        short(app.project().named(app.selected), 12)
+                        "Properties edit only {}",
+                        short(app.project().named(app.selected), 36)
                     ))
                     .wrapping(widget::text::Wrapping::None),
                 );

docs/language.html

@@ -2702,7 +2702,19 @@ performer change with diagram placement. The preview MUST identify the
 destination and preserve readable work and destination identity. Destination
 identity is shown outside the canvas, independently of explanatory or refusal
 text. The outlined target's hit region remains fixed throughout the gesture;
-feedback MUST NOT obscure the work or change its pointer-relative placement.
+feedback MUST NOT obscure the work. Preserve pointer-relative placement when
+the requested position is valid. When an outgoing drop would leave work
+overlapping its former performer, the editor MAY propose a minimal grid-aligned
+translation through a crossed performer boundary, with one grid unit of
+clearance. It MUST preview that exact position, translate the complete affected
+work group rigidly, and recheck all semantic and collision constraints on release.
+It MUST NOT move unrelated placements or search arbitrary free space. If no
+proposal is valid, a pointer-following outline MAY accompany the last valid
+preview; that retained preview MUST NOT authorize a refused release.
+Outgoing work headers MAY be partly outside the viewport provided each retains
+at least a 24-by-24 logical-pixel grab region. Releasing the pointer outside the
+viewport still cancels. Other assignment and Arrange gestures retain their
+complete-header visibility requirement.
 A clean click selects without applying unrelated drafts. A refused work press
 with an unapplied property draft MUST preserve its text, caret and focused
 editor. An accepted drag is one atomic model/source/history transaction:

docs/language.rst

@@ -2128,7 +2128,19 @@ performer change with diagram placement. The preview MUST identify the
 destination and preserve readable work and destination identity. Destination
 identity is shown outside the canvas, independently of explanatory or refusal
 text. The outlined target's hit region remains fixed throughout the gesture;
-feedback MUST NOT obscure the work or change its pointer-relative placement.
+feedback MUST NOT obscure the work. Preserve pointer-relative placement when
+the requested position is valid. When an outgoing drop would leave work
+overlapping its former performer, the editor MAY propose a minimal grid-aligned
+translation through a crossed performer boundary, with one grid unit of
+clearance. It MUST preview that exact position, translate the complete affected
+work group rigidly, and recheck all semantic and collision constraints on release.
+It MUST NOT move unrelated placements or search arbitrary free space. If no
+proposal is valid, a pointer-following outline MAY accompany the last valid
+preview; that retained preview MUST NOT authorize a refused release.
+Outgoing work headers MAY be partly outside the viewport provided each retains
+at least a 24-by-24 logical-pixel grab region. Releasing the pointer outside the
+viewport still cancels. Other assignment and Arrange gestures retain their
+complete-header visibility requirement.
 A clean click selects without applying unrelated drafts. A refused work press
 with an unapplied property draft MUST preserve its text, caret and focused
 editor. An accepted drag is one atomic model/source/history transaction:
@@ -2279,28 +2291,6 @@ transition row, uses confirmed relation deletion for either key. States and
 referenced Activity/Function definitions remain. Hidden or collapsed rows are
 not keyboard deletion targets.
 
-For a group in a saved architecture or state view, plain Delete retains its
-placement-only Hide meaning; a mixture containing ports, edges or state rows
-MUST refuse Hide rather than silently delete model objects. Explicit group
-model deletion, including focused Shift+Delete, resolves each exact visible
-placement to its semantic element, each port to that port, each stored edge to
-its relation or trace, and each state row to its maintained relation. Navigation
-groupings and inferred edges are not semantic deletion subjects. Every original
-typed member MUST be admitted before redundant semantic subjects or cascade
-commands are reduced. A selected ancestor does not make a hidden or invalid
-member admissible. Existing project validity constraints, including placement
-uniqueness within a diagram, remain in force.
-
-Saved-view aggregate review distinguishes selected visual targets, unique
-semantic subjects, actual deleted records and changed surviving records. Model
-deletion affects all placements of deleted elements in all views. A trace does
-not cause deletion of its counterpart endpoints; an explicitly selected
-counterpart remains an independent deletion subject. Removing a state action
-row deletes its maintained relation, not the referenced Activity or Function.
-The combined candidate and source update MUST form one atomic transaction;
-neither partial primary-only deletion nor intermediate singleton history is
-permitted.
-
 Process and scenario projections have no independent occurrence placements.
 Delete and Shift+Delete request confirmed removal of the selected occurrence,
 participant or maintained link. A link's endpoints and outbound reusable
@@ -2314,26 +2304,6 @@ A qualified selection inside an expanded reusable process MUST NOT silently
 delete the outer reference or shared definition item. The editor directs the
 user to open the definition or explicitly select the outer reference.
 
-For a group of local Process or FunctionalChain contributions and maintained
-links, removal MUST admit every original typed selection member before reducing
-overlapping cascade commands. A selected link already removed by a selected
-occurrence's cascade remains a selected effect in the review. A mixed local and
-qualified selection MUST refuse as a whole, without a primary-only fallback.
-A locally owned ContextualLink is distinct from a read-only relation displayed
-inside a reused definition; its explicit owner governs removal even when both
-endpoint paths are qualified.
-
-The aggregate review MUST identify actual deleted records, changed surviving
-records, and affected caller definitions. Removing the last explicit topology
-marker can restore an exchange-only sequence's implicit ordered meaning;
-removing an interior exchange from a legacy order changes adjacent pairs.
-These consequences MUST be explicit before confirmation. Reused topology and
-entry/exit connections can also change without an interpretation-mode switch
-or new stored relation. Caller-definition counts MUST NOT be presented as
-counts of reference instances. Empty or incomplete surviving sequences retain
-their ordinary diagnostics; deletion MUST NOT invent replacement controls or
-links to conceal such consequences.
-
 Confirmation identifies the captured object and removal effect. Cancel and
 Escape preserve model, source and history. A confirmation token belongs to one
 dialog; changes to its document, revision, owner or selected identity invalidate

harness/STATE.md

@@ -25,7 +25,13 @@ the current code includes that one-line correction. The original compile failed
 before running tests. The first combined compile at `897d9f04` subsequently
 found a missing `text_editor` import in the Allocation Text Apply regression;
 the current source includes that one-line correction too. Both failures remain
-recorded in the source handoff. Corrected combined execution remains pending.
+recorded in the source handoff. The subsequent full test run at `8ddfadf4`
+failed the mounted State picker fixture: added selection controls invalidated
+its canvas-relative clicks. Source successor `a9cd364eacbbffa0693bab05b5a2b65f9d105535`
+measures an identified fixed-height picker slot and checks Escape capture,
+retaining the exact preservation/reopen/Place/Undo assertions. The source
+handoff links the preserved failed and interrupted attempts. Corrected combined
+Windows execution and package acceptance remain pending.
 
 Live build, final-source and publication results belong in
 [issue37](http://217.177.34.108:3000/sorokin.oleg.edu/ARCADIA-Studio/issues/37).

harness/drag-out-20260925.md

@@ -0,0 +1,88 @@
+# Outgoing allocation dragging
+
+Scope: [issue 40](http://217.177.34.108:3000/sorokin.oleg.edu/ARCADIA-Studio/issues/40),
+based on published Windows source `715036e132677dd2bc2fb37ed316d93dc9987aec`.
+This contribution is not integrated release acceptance. User requirements remain
+in `PROJECT_GOAL.md`; this note records a revision to derived interaction policy.
+
+## Reproduction and cause
+
+The released executable SHA256
+`2c03bd6cc3f1110c219e4f57ab94874a121590f83779239a93289b7170664399`
+opened a copied Allocation/Process companion fixture on Windows. At 1440x900,
+72% Fit, the OA assign view's X-receive was dragged from window (486,546) to
+(365,546), just beyond A's left edge. It remained assigned at its original
+position, reporting enlarged card overlap. A control drag to (625,572) removed
+assignment; Undo restored the original scene. These are actual native end-state
+observations; intermediate jitter was diagnosed from source, not frame capture.
+
+Frozen targets resolve from the pointer, while placement retains its grab
+offset. The pointer therefore leaves its performer before the full work card
+does. Former parent/child intersection becomes unrelated overlap after removing
+allocation. Refused motion previously cleared the preview and redrew the saved
+scene. Additionally, whole-header viewport containment rejects a useful outgoing
+position in the fitted reproduction even when its model geometry is valid.
+
+## Selected policy
+
+Try exact snapped pointer placement first. Only an outgoing assignment candidate
+with a placement refusal may propose bounded source clearance: move the entire
+captured work footprint through a crossed frozen source boundary, clearing the
+post-removal source enclosure by one 10-world-unit grid cell. Consider at most
+four directions, ordered by press-to-pointer boundary-crossing fraction and a
+fixed direction tie-break. Existing placement, collision, semantic, exact-command
+and source/history admission remain authoritative. No neighbor is moved, no
+general packing/search occurs, and no semantic refusal is overridden.
+
+The accepted/candidate semantic indexes are reused during fallback projections.
+Outgoing headers may be partly clipped but each must retain a 24x24 logical-pixel
+grab region. Other assignment and Arrange visibility rules remain unchanged.
+The exact corrected candidate is previewed; release recomputes it. Blocked
+in-bounds motion retains its last admitted scene and adds an orange pointer
+outline. This display state confers no permission to commit on refused release.
+Cancel, outside release and gesture invalidation retire it normally.
+
+Rejected alternatives: retaining a moving outline alone leaves the boundary
+dead band; allowing unrelated overlap makes unassigned work look allocated;
+general auto-layout changes unrelated placement and makes drag intent harder to
+predict. The previous unconditional pointer-offset rule is narrowed in
+`docs/language.rst` and its HTML copy. Real neighboring-card collisions and
+insufficient visible grab area can still refuse a drop.
+
+## Verification status
+
+Independent source diagnosis and repair critique found no semantic/stale/cancel
+bypass. Review exposed the remaining whole-header camera restriction and an
+obsolete retained-preview assertion; both were revised. Added checks cover
+OA/SA boundary clearance, corners, source shrinkage, rigid descendants/groups,
+real App frame-by-frame input, exact source/history, cancellation, blocked release
+and outgoing grab-area boundaries. At clean source
+`1a669130fb6d2b65279aab3847e966a1a282c191`, the Windows allocation-drag
+suite passes 121 tests (none failed or ignored; 1,424 filtered out), strict
+desktop all-target Clippy passes, and the normal desktop development build
+passes. [Raw results and reproduction commands](experiments/drag-out-20260925/README.md)
+preserve the source, platform, failed attempts and exact scope. These checks do
+not prove native usability. Computer Use was stopped with the physical Escape
+key before the changed executable could be inspected. Fitted-view dragging,
+clipped-card identification/regrabbing, native Undo/Redo and Save/reopen remain
+unverified. The issue remains open; no integration or release acceptance follows
+from the targeted gates.
+
+Test-only successor `24b1eab07d306d8cb091bb46f7daf9f027a8f1c0` additionally
+checks an actual fallback blocked by unrelated work, including preservation of
+an existing redo branch, and an outgoing move while an allocated sibling keeps
+the source enclosure expanded. Both run for OA and SA. All 123 allocation-drag
+tests and strict desktop Clippy pass at that successor. Fresh independent review
+confirms those tests exercise their claimed invariants, with no material source
+finding in this scope. The same linked evidence includes the new logs and review;
+production code and native-acceptance limits remain unchanged.
+
+The first build attempt failed before tests because the sparse checkout omitted
+`build/windows_manifest.rs`; restoring the tracked build directory corrected the
+checkout. The local drive initially had about 22 MB free. Git sparse checkout and
+Cargo's package-scoped cleanup of inactive desktop artifacts recovered capacity.
+Automatic review rejected recursive deletion of the extracted preview; it was
+left intact. No published package or unique evidence was deleted.
+The second attempt also exposed omitted tracked harness fixtures and a `Self`
+typo in a standalone test helper; both were corrected before the passing run.
+That failed compiler process was terminated after its errors were captured.

harness/experiments/architecture-perf-20260925/.gitattributes

@@ -0,0 +1 @@
+*.log -text

harness/experiments/architecture-perf-20260925/README.md

@@ -0,0 +1,91 @@
+# Small architecture diagram CPU investigation
+
+Question: does core projection/routing explain [issue 44's low FPS](http://217.177.34.108:3000/sorokin.oleg.edu/ARCADIA-Studio/issues/44)
+with roughly eight architecture cards? This experiment narrows that question;
+it neither reproduces native frame rate nor establishes a complete cause.
+
+## Workload and source
+
+The screenshot uses names from `examples/release1`. Its exact model, projection,
+camera and authored geometry are unavailable. The probe loads the unchanged
+`examples/release1/model.json`, measures its five saved views, and constructs a
+clearly labeled eight-card SA Overview approximation using those semantic
+elements. Approximate coordinates and stable placement IDs are in the probe;
+it has 8 projected nodes, 6 ports and 13 projected edges. It is not a recovered
+copy of the user's diagram. All data changes occur in memory.
+
+Source: `24b1eab07d306d8cb091bb46f7daf9f027a8f1c0`; core, manifest and lockfile
+are unchanged from the drag contribution's `1a669130` production source.
+Windows 10.0.26200, Rust 1.98.1, x86_64-pc-windows-gnullvm, LLVM-MinGW
+20260908 UCRT, reported CPU Intel Core i7-10870H with 4 exposed cores/threads.
+The probe was optimized with `-O` and linked to the existing **unoptimized
+development-profile core library** used by the completed desktop test build.
+This distinction matters: optimizing the driver does not optimize that library.
+The desktop test process had completed before measurement; no Cargo compilation
+was started until after measurement. Other operating-system workloads were not
+controlled, so outliers are retained rather than interpreted as stable capacity.
+
+## Method and results
+
+Each phase gets 3 warmups and 40 timed samples, with returned values passed to
+`black_box`. Reported p50/p95 select sorted index `ceil((n-1)*p)` as implemented
+in the source. Returned output destruction is outside each timed phase. Diagram
+movement uses a deterministic small delta sequence and the existing descendant
+and authored-route translation APIs. Index creation, projection, routing, and
+combined movement preparation are measured separately. The probe does not model
+allocation transaction admission or an Iced frame.
+
+For the eight-card approximation, `performance-01.log` records:
+
+| Phase | p50 ms | p95 ms | max ms |
+| --- | ---: | ---: | ---: |
+| Reused-index projection | 0.3885 | 0.7550 | 1.2965 |
+| Fresh-index projection | 1.7135 | 2.7022 | 4.2204 |
+| Settled routing | 2.4525 | 4.4617 | 4.7735 |
+| Moved routing | 3.1907 | 4.4781 | 4.5672 |
+| Movement preparation + projection + routing | 4.2640 | 6.8259 | 8.8052 |
+
+This workload does not expose severe core latency sufficient by itself to
+explain very low FPS. It does not rule out different authored routes, allocation
+admission, hardware/rendering, or the user's exact scene. Repeated fresh-index
+projection has a measurable cost, but no change is justified solely by this
+small sample. No FPS or performance-fix claim follows.
+
+## Source observations and next discriminating measurement
+
+Independent read-only hot-path review found that `DiagramCanvas::scene` already
+caches projection and routing by semantic context and transient geometry.
+Ordinary node movement changes preview geometry and routes the full view;
+route gestures use `route_edge_preview`. Ordinary hover need not reroute.
+
+`diagram/port_labels.rs` requests redraw on every mouse event, including when
+no tooltip is visible. `DiagramCanvas::draw` rebuilds geometry and each dot-grid
+circle on every draw. At a 1900x660 canvas this yields about 2,240 circles at
+zoom 1 and 6,528 at minimum spacing. Scene caching does not cache that geometry.
+`views.rs` also performs an unindexed `project_view` during app view rebuilding;
+legacy node-motion redraw does not itself require that full UI rebuild.
+
+Next, measure actual canvas draw/frame costs independently for idle hover, pan,
+ordinary node drag and allocation drag, with grid generation separated from
+node/edge/text rendering and frame presentation. Compare the same scene/camera
+and renderer before changing production code. Native automation was stopped
+with Escape; no GPU/frame measurement was attempted in this experiment. Live
+ownership and subsequent results belong to issue 44.
+
+## Reproduction
+
+Build `oa-core` at the identified source with the stated Windows toolchain, then
+compile this standalone probe against that exact library and matching dependency
+directory. For a fresh standard Cargo development build:
+
+```powershell
+cargo build --locked -p oa-core
+rustc --edition=2024 -O harness/experiments/architecture-perf-20260925/architecture_perf_probe.rs --extern oa_core=target/debug/liboa_core.rlib -L dependency=target/debug/deps -C linker=clang.exe -o architecture_perf_probe.exe
+./architecture_perf_probe.exe examples/release1/model.json 40
+```
+
+The actual run linked `target/debug/deps/liboa_core-2f3c5174cb6398fd.rlib`
+and used the same dependency directory. Set the linker/runtime PATH as required
+by the Windows toolchain. Compiler flags, core profile, machine load and fixture
+all affect timings; preserve them when comparing candidates. This standalone
+probe is experimental evidence, not a production dependency or a timing test.

harness/experiments/architecture-perf-20260925/architecture_perf_probe.rs

@@ -0,0 +1,166 @@
+//! Local-only CPU diagnosis. Does not measure native FPS, canvas redraw, or GPU.
+//! Usage: architecture_perf_probe.exe PATH_TO_RELEASE1_MODEL_JSON [SAMPLES=40]
+use oa_core::{persistence, projection, routing, view_options::ViewIndex, *};
+use std::{collections::BTreeMap, hint::black_box, time::Instant};
+
+fn measure<T>(label: &str, samples: usize, mut f: impl FnMut(usize) -> T) {
+    for i in 0..3 {
+        black_box(f(i));
+    }
+    let mut ms = Vec::with_capacity(samples);
+    for i in 0..samples {
+        let start = Instant::now();
+        let output = black_box(f(i));
+        ms.push(start.elapsed().as_secs_f64() * 1000.0);
+        drop(output); // Exclude destruction consistently from each timed phase.
+    }
+    ms.sort_by(f64::total_cmp);
+    let percentile = |p: f64| ms[((samples - 1) as f64 * p).ceil() as usize];
+    println!(
+        "{label}: n={samples} p50_ms={:.4} p95_ms={:.4} max_ms={:.4}",
+        percentile(0.5),
+        percentile(0.95),
+        ms[samples - 1]
+    );
+}
+
+fn probe(p: &Project, d: &Diagram, samples: usize) {
+    let index = ViewIndex::new(p);
+    let view = projection::project_diagram_with_index(p, d, &index);
+    println!(
+        "\nview={} projection={:?} nodes={} ports={} edges={}",
+        d.name,
+        d.projection,
+        view.nodes.len(),
+        view.ports.len(),
+        view.edges.len()
+    );
+    measure("index_new", samples, |_| ViewIndex::new(black_box(p)));
+    measure("projection_reused_index", samples, |_| {
+        projection::project_diagram_with_index(black_box(p), black_box(d), black_box(&index))
+    });
+    measure("projection_fresh_index", samples, |_| {
+        projection::project_diagram(black_box(p), black_box(d))
+    });
+    measure("routing_settled", samples, |_| {
+        routing::route_diagram(black_box(p), black_box(d), black_box(&view))
+    });
+    // Deterministic slight motion of the first root card. Includes the same
+    // descendant/route translation as legacy single-card canvas drag. This is
+    // presentation-only, not the allocation transaction pipeline.
+    let Some(root) = view.nodes.iter().find(|n| n.visual_parent.is_none()) else {
+        return;
+    };
+    println!("moving_root={} element={}", root.id, p.named(root.element));
+    let mut moved = projection::descendant_nodes(p, d.id, root.id);
+    moved.push(root.id);
+    let make_moved = |i: usize| {
+        let delta = Position {
+            x: (i % 21) as f32 * 3.0,
+            y: (i % 11) as f32 * 2.0,
+        };
+        let mut preview = d.clone();
+        let deltas = moved
+            .iter()
+            .map(|id| (*id, delta))
+            .collect::<BTreeMap<_, _>>();
+        for route in projection::translated_routes(p, d, &deltas) {
+            if let Some(stored) = preview.routes.iter_mut().find(|r| r.edge == route.edge) {
+                *stored = route;
+            } else {
+                preview.routes.push(route);
+            }
+        }
+        for id in &moved {
+            if let Some(n) = preview.nodes.get_mut(id) {
+                n.position.x += delta.x;
+                n.position.y += delta.y;
+            }
+        }
+        preview
+    };
+    let previews = (0..samples.max(3)).map(make_moved).collect::<Vec<_>>();
+    let projected = previews
+        .iter()
+        .map(|d| projection::project_diagram_with_index(p, d, &index))
+        .collect::<Vec<_>>();
+    measure("moved_projection", samples, |i| {
+        projection::project_diagram_with_index(p, black_box(&previews[i]), &index)
+    });
+    measure("moved_routing", samples, |i| {
+        routing::route_diagram(p, black_box(&previews[i]), black_box(&projected[i]))
+    });
+    measure("moved_prepare_projection_routing", samples, |i| {
+        let preview = make_moved(i);
+        let view = projection::project_diagram_with_index(p, &preview, &index);
+        routing::route_diagram(p, &preview, &view)
+    });
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let args = std::env::args().collect::<Vec<_>>();
+    let path = args
+        .get(1)
+        .ok_or("usage: architecture_perf_probe PATH [SAMPLES]")?;
+    let samples = args
+        .get(2)
+        .map(|s| s.parse::<usize>())
+        .transpose()?
+        .unwrap_or(40)
+        .max(1);
+    let p = persistence::decode(&std::fs::read(path)?)?;
+    println!(
+        "CPU-only probe; samples={samples}; fixture={path}; elements={} relations={}",
+        p.elements.len(),
+        p.relations.len()
+    );
+    for d in p.diagrams.values() {
+        probe(&p, d, samples);
+    }
+    // Approximation of the reported eight-card screenshot, not an exact repro:
+    // fixture semantics, Overview projection, synthetic positions/card sizes.
+    let mut approx = p.clone();
+    let id: Id = "f0440000-0000-4000-8000-000000000001".parse()?;
+    approx.diagrams.insert(
+        id,
+        Diagram {
+            id,
+            alias: "fps44_approx_overview".into(),
+            name: "APPROXIMATION eight-card SA Overview".into(),
+            description: "Synthetic positions, not user geometry".into(),
+            layer: Layer::Sa,
+            projection: ProjectionKind::Overview,
+            view_options: Default::default(),
+            nodes: BTreeMap::new(),
+            routes: vec![],
+            layout: None,
+        },
+    );
+    for (ordinal, (alias, x, y)) in [
+        ("sa_assessment_procedure", 30., 240.),
+        ("sa_triage", 510., 240.),
+        ("sa_control", 990., 240.),
+        ("sa_technician", 530., 440.),
+        ("sa_assess", 1490., 240.),
+        ("sa_repair", 1030., 440.),
+        ("sa_confirm", 1530., 440.),
+        ("sa_reset", 30., 440.),
+    ]
+    .into_iter()
+    .enumerate()
+    {
+        let element = approx
+            .elements
+            .values()
+            .find(|e| e.alias == alias)
+            .ok_or_else(|| format!("missing alias {alias}"))?
+            .id;
+        let generated = approx.place(id, element, Position { x, y });
+        let diagram = approx.diagrams.get_mut(&id).unwrap();
+        let mut node = diagram.nodes.remove(&generated).unwrap();
+        node.id = format!("f0440000-0000-4000-8000-{:012}", ordinal + 2).parse()?;
+        diagram.nodes.insert(node.id, node);
+    }
+    probe(&approx, &approx.diagrams[&id], samples);
+    Ok(())
+}

harness/experiments/architecture-perf-20260925/context.json

@@ -0,0 +1,11 @@
+{
+  "source": "24b1eab07d306d8cb091bb46f7daf9f027a8f1c0",
+  "core_profile": "dev unoptimized",
+  "driver_optimization": "rustc -O",
+  "samples_per_phase": 40,
+  "warmups_per_phase": 3,
+  "rlib_sha256": "E10C81BF28A33CD0FB6C4C26884CFFA480EF05328E78BCDB138DD4B635B2531C",
+  "fixture_sha256": "EF0EF4006C3E09D5DB6E1B621256B3F7D6642F3A7B09CC34607CFBCCA830C727",
+  "driver_exe_sha256": "4C66E9CDE4F08D6DFD2A0DC3DBF1A80B97E340F3F22CA001A76301F06F47C2E2",
+  "native_fps_measured": false
+}

harness/experiments/architecture-perf-20260925/performance-01.log

@@ -0,0 +1,61 @@
+CPU-only probe; samples=40; fixture=.local/drag-out-01a0d6fd/examples/release1/model.json; elements=94 relations=62
+
+view=1 · OA responsibility and repair traffic projection=Allocation nodes=6 ports=0 edges=3
+index_new: n=40 p50_ms=1.0106 p95_ms=2.0583 max_ms=2.0910
+projection_reused_index: n=40 p50_ms=0.5702 p95_ms=1.2320 max_ms=1.3490
+projection_fresh_index: n=40 p50_ms=1.5505 p95_ms=3.6681 max_ms=5.1533
+routing_settled: n=40 p50_ms=0.1944 p95_ms=0.3391 max_ms=0.4246
+moving_root=3191e05c-1c7f-5f0e-beb0-5f3bded54c48 element=Control room
+moved_projection: n=40 p50_ms=0.4848 p95_ms=1.2745 max_ms=1.5797
+moved_routing: n=40 p50_ms=0.1994 p95_ms=0.7971 max_ms=1.1414
+moved_prepare_projection_routing: n=40 p50_ms=0.9250 p95_ms=2.6847 max_ms=10.4908
+
+view=5 · SA pressure supervision projection=StateMachine { machine: 132b3f28-3f88-5327-9868-8c8b645ed412 } nodes=5 ports=0 edges=3
+index_new: n=40 p50_ms=0.9602 p95_ms=2.1394 max_ms=2.4512
+projection_reused_index: n=40 p50_ms=0.1697 p95_ms=0.7629 max_ms=1.1780
+projection_fresh_index: n=40 p50_ms=1.1189 p95_ms=2.6324 max_ms=3.3912
+routing_settled: n=40 p50_ms=0.7063 p95_ms=1.0812 max_ms=1.1149
+moving_root=a676fbb9-0833-59a8-98cf-a10d8f4b7434 element=Pressure supervision
+moved_projection: n=40 p50_ms=0.1565 p95_ms=0.3445 max_ms=0.3790
+moved_routing: n=40 p50_ms=0.6113 p95_ms=1.3199 max_ms=1.3733
+moved_prepare_projection_routing: n=40 p50_ms=0.8259 p95_ms=1.7640 max_ms=2.1752
+
+view=2 · SA service boundary and functions projection=Allocation nodes=6 ports=6 edges=3
+index_new: n=40 p50_ms=0.7820 p95_ms=3.4180 max_ms=6.8439
+projection_reused_index: n=40 p50_ms=0.7938 p95_ms=1.9946 max_ms=2.1411
+projection_fresh_index: n=40 p50_ms=2.0597 p95_ms=3.4554 max_ms=3.6616
+routing_settled: n=40 p50_ms=0.1478 p95_ms=0.7886 max_ms=1.0081
+moving_root=8345c76a-8d85-5c31-902e-ec1cd33ed4a3 element=Pressure coordination service
+moved_projection: n=40 p50_ms=0.6914 p95_ms=1.5286 max_ms=1.8658
+moved_routing: n=40 p50_ms=0.1862 p95_ms=0.5658 max_ms=2.8924
+moved_prepare_projection_routing: n=40 p50_ms=1.1724 p95_ms=3.1806 max_ms=4.2620
+
+view=4 · SA mission and included capability projection=Capabilities nodes=4 ports=1 edges=3
+index_new: n=40 p50_ms=0.6879 p95_ms=1.3582 max_ms=1.5266
+projection_reused_index: n=40 p50_ms=0.1562 p95_ms=0.6767 max_ms=1.0102
+projection_fresh_index: n=40 p50_ms=1.2929 p95_ms=2.3543 max_ms=4.0762
+routing_settled: n=40 p50_ms=0.2553 p95_ms=1.4389 max_ms=1.6677
+moving_root=069a3fb3-077c-59d8-91da-27b0665143c7 element=Assess an alarm
+moved_projection: n=40 p50_ms=0.1243 p95_ms=0.1928 max_ms=0.2212
+moved_routing: n=40 p50_ms=0.2271 p95_ms=0.6733 max_ms=1.2408
+moved_prepare_projection_routing: n=40 p50_ms=0.5542 p95_ms=1.3344 max_ms=1.8957
+
+view=3 · SA service conversation only projection=Allocation nodes=6 ports=6 edges=1
+index_new: n=40 p50_ms=0.9618 p95_ms=1.6890 max_ms=2.0995
+projection_reused_index: n=40 p50_ms=0.6661 p95_ms=2.3388 max_ms=2.6429
+projection_fresh_index: n=40 p50_ms=2.3913 p95_ms=4.1941 max_ms=4.8120
+routing_settled: n=40 p50_ms=0.0660 p95_ms=0.2156 max_ms=0.6289
+moving_root=40210589-69f7-5209-b329-10bb83cf615c element=Field technician
+moved_projection: n=40 p50_ms=0.5527 p95_ms=1.1239 max_ms=1.1362
+moved_routing: n=40 p50_ms=0.0495 p95_ms=0.1771 max_ms=0.2209
+moved_prepare_projection_routing: n=40 p50_ms=0.7963 p95_ms=4.1835 max_ms=6.7551
+
+view=APPROXIMATION eight-card SA Overview projection=Overview nodes=8 ports=6 edges=13
+index_new: n=40 p50_ms=0.7487 p95_ms=1.9597 max_ms=2.2005
+projection_reused_index: n=40 p50_ms=0.3885 p95_ms=0.7550 max_ms=1.2965
+projection_fresh_index: n=40 p50_ms=1.7135 p95_ms=2.7022 max_ms=4.2204
+routing_settled: n=40 p50_ms=2.4525 p95_ms=4.4617 max_ms=4.7735
+moving_root=f0440000-0000-4000-8000-000000000002 element=Assess an alarm procedure
+moved_projection: n=40 p50_ms=0.4691 p95_ms=0.8354 max_ms=1.0408
+moved_routing: n=40 p50_ms=3.1907 p95_ms=4.4781 max_ms=4.5672
+moved_prepare_projection_routing: n=40 p50_ms=4.2640 p95_ms=6.8259 max_ms=8.8052