Box the optional exact State menu target to bound message size

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()?