Experiment: reset visible route pins and labels during Layout

crates/oa-core/src/session.rs

@@ -952,6 +952,16 @@ fn layout(p: &mut Project, diagram: Id) -> Result<(), ModelError> {
             "Scenario layout requires the Scenario geometry operation.".into(),
         ));
     }
+    // Freeze reset eligibility before this operation changes geometry. In a
+    // Batch this is the staged input, not an independently validated prefix.
+    let view = crate::projection::project_view(p, diagram);
+    let visible_nodes: BTreeSet<_> = view.nodes.iter().map(|node| node.id).collect();
+    let reset_routes: BTreeSet<_> = view.edges.iter().filter_map(|edge| {
+        let owners = crate::projection::edge_endpoint_placements(p, d, edge.id)?;
+        (owners == (edge.source, edge.target)
+            && visible_nodes.contains(&edge.source)
+            && visible_nodes.contains(&edge.target)).then_some(edge.id)
+    }).collect();
     let parents = crate::projection::parents(p, d);
     let mut children: BTreeMap<Option<Id>, Vec<Id>> = BTreeMap::new();
     for (id, parent) in &parents {
@@ -1044,8 +1054,7 @@ fn layout(p: &mut Project, diagram: Id) -> Result<(), ModelError> {
         }
         node
     };
-    let edges: BTreeSet<_> = crate::projection::project_view(p, diagram)
-        .edges
+    let edges: BTreeSet<_> = view.edges
         .iter()
         .filter_map(|edge| {
             let source = root_of(edge.source);
@@ -1138,5 +1147,11 @@ fn layout(p: &mut Project, diagram: Id) -> Result<(), ModelError> {
             *existing = route;
         }
     }
+    for route in &mut d.routes {
+        if reset_routes.contains(&route.edge) {
+            route.waypoints.clear();
+            route.label = None;
+        }
+    }
     Ok(())
 }