Box the optional exact State menu target to bound message size

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

@@ -165,7 +165,7 @@ impl App {
                 let mut request = crate::model_menu::Request::object(object, anchor);
                 request.canvas = Some(context);
                 request.placement = placement;
-                request.selection_target = selection_target;
+                request.selection_target = selection_target.map(Box::new);
                 request.bend = bend;
                 request.route_segment = route_segment;
                 return self.handle(Message::Menu(crate::model_menu::Event::Open(request)));

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

@@ -1016,7 +1016,7 @@ async fn state_actions_trigger_captures_exact_row_without_owner_placement_and_st
         };
         assert_eq!(request.object, relation);
         assert_eq!(request.placement, None);
-        assert_eq!(request.selection_target, Some(row.clone()));
+        assert_eq!(request.selection_target.as_deref(), Some(&row));
         assert_eq!(request.canvas, f.app.state_context());
         let mut wrong = request.clone();
         wrong.placement = Some(f.a);
@@ -1028,7 +1028,7 @@ async fn state_actions_trigger_captures_exact_row_without_owner_placement_and_st
             .app
             .update(Message::Menu(MenuEvent::Open(request.clone())));
         let opened = f.app.model_menu.as_ref().unwrap();
-        assert_eq!(opened.request.selection_target, Some(row.clone()));
+        assert_eq!(opened.request.selection_target.as_deref(), Some(&row));
         assert_eq!(opened.request.placement, None);
         assert_eq!(
             f.app.multiselect_snapshot().unwrap().targets(),
@@ -1080,10 +1080,10 @@ async fn state_actions_trigger_captures_exact_row_without_owner_placement_and_st
             model_menu::Opened::new(&f.app, stale_row.clone(), 2).is_none(),
             "a fresh envelope cannot rebind the old row occurrence"
         );
-        stale_row.selection_target = Some(Target::StateRow {
+        stale_row.selection_target = Some(Box::new(Target::StateRow {
             placement: f.b,
             relation,
-        });
+        }));
         assert!(
             model_menu::Opened::new(&f.app, stale_row, 2).is_some(),
             "the replacement occurrence is independently visible"

crates/oa-desktop/src/model_menu.rs

@@ -12,7 +12,7 @@ pub struct Request {
     pub anchor: Point,
     pub object: Id,
     pub placement: Option<Id>,
-    pub selection_target: Option<crate::diagram_usage::Target>,
+    pub selection_target: Option<Box<crate::diagram_usage::Target>>,
     pub bend: Option<usize>,
     pub route_point: Option<Position>,
     pub route_segment: Option<(usize, Position)>,
@@ -98,7 +98,7 @@ impl Opened {
 
 fn target_matches(app: &App, request: &Request) -> bool {
     use crate::diagram_usage::Target;
-    let Some(target) = &request.selection_target else {
+    let Some(target) = request.selection_target.as_deref() else {
         return true;
     };
     if request.canvas.is_none() || !app.multiselect_target_visible(target) {
@@ -157,7 +157,7 @@ pub fn trigger(app: &App) -> iced::Element<'_, Message> {
             } else if app.page == Page::Behavior {
                 request.canvas = app.state_context();
                 if let Some(target) = app.diagram_selection.as_ref().and_then(|s| s.primary()) {
-                    request.selection_target = Some(target.clone());
+                    request.selection_target = Some(Box::new(target.clone()));
                     request.placement = match target {
                         crate::diagram_usage::Target::Placement(id) => {
                             if let Some(node) = request
@@ -244,7 +244,8 @@ pub fn popup(app: &App) -> Option<Menu<Message>> {
             .map(|d| projection::project_view_with_index(p, d, app.document.view_index()));
         let target = request
             .selection_target
-            .clone()
+            .as_deref()
+            .cloned()
             .or_else(|| request.placement.map(Target::Placement))
             .or_else(|| {
                 view.as_ref()?