feat: preview and commit Saved Scenario spacing gestures

crates/oa-desktop/src/app.rs

@@ -11,6 +11,7 @@ mod reference_authoring;
 #[cfg(test)]
 mod review_navigation_tests;
 mod scenario_diagram;
+mod scenario_spacing;
 pub(crate) mod source_rename;
 mod source_symbols;
 #[cfg(test)]
@@ -1271,6 +1272,9 @@ impl App {
         ])
     }
     pub fn update(&mut self, message: Message) -> Task<Message> {
+        if let Message::ScenarioCanvas(behavior::scenario::CanvasEvent::Spacing(event)) = &message {
+            return self.scenario_spacing(*event);
+        }
         // Reject stale rename intents before camera/reveal reconciliation or
         // source interaction can disturb a newer navigation destination.
         if let Message::SourceRename(event) = &message
@@ -1330,6 +1334,7 @@ impl App {
                 | Message::TopologyCanvas(crate::behavior::topology::CanvasEvent::Camera(..))
         );
         let before = self.camera_boundary();
+        let spacing_selected = self.selected;
         let task = self.update_inner(message);
         if window_resized && let Some((_, _, epoch)) = &mut self.pending_diagram_reveal {
             *epoch = self.canvas_epoch;
@@ -1344,6 +1349,13 @@ impl App {
         {
             self.diagram_navigation_focus = None;
         }
+        if (self.camera_boundary() != before
+            || self.selected != spacing_selected
+            || !self.spacing_enabled())
+            && self.behavior.scenario.cancel_spacing()
+        {
+            self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
+        }
         if !camera && self.camera_boundary() != before {
             self.camera_epoch = self.camera_epoch.wrapping_add(1);
             self.camera_boundary_epoch = self.canvas_epoch;
@@ -1378,6 +1390,9 @@ impl App {
             Message::ScenarioCanvas(Scenario::Camera(c, lifetime, Camera::Focus))
                 if valid_scenario(*c) && *lifetime == scope.epoch =>
             {
+                if self.behavior.scenario.cancel_spacing() {
+                    self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
+                }
                 return canvas_workspace::focus_task(scope, Camera::Focus);
             }
             Message::TopologyCanvas(Process::Camera(c, lifetime, Camera::Focus))
@@ -1403,6 +1418,9 @@ impl App {
             _ => return Task::none(),
         }
         let task = self.update(message);
+        if self.behavior.scenario.cancel_spacing() {
+            self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
+        }
         // Reapplying Fit or a tool also ends a held gesture. Focus is stamped
         // after the action, for Iced's final-view ordering.
         if self.camera_epoch == scope.epoch {
@@ -1972,6 +1990,9 @@ impl App {
                     {
                         return Task::none();
                     }
+                    if self.behavior.scenario.cancel_spacing() {
+                        self.canvas_epoch = self.canvas_epoch.wrapping_add(1);
+                    }
                     match input {
                         Event::Focus
                         | Event::Traverse(_)