Fix small rendering errors when editing model system

src/XTMF2.GUI/Controls/ModelSystemCanvas/ModelSystemCanvas.Input.cs

@@ -949,6 +949,17 @@ protected override void OnPointerReleased(PointerReleasedEventArgs e)
             return;
         }
 
+        // ── Left-button release: end element resize ──────────────────────
+        if (_resizing is not null)
+        {
+            _resizing.CommitResize();
+            _resizing = null;
+            e.Pointer.Capture(null);
+            InvalidateAndMeasure();
+            e.Handled = true;
+            return;
+        }
+
         // ── Left-button release: end element drag ─────────────────────────
         if (_dragging is null) return;
         if (_vm is null) return;

src/XTMF2.GUI/Controls/ModelSystemCanvas/ModelSystemCanvas.Rendering.cs

@@ -676,6 +676,22 @@ private void RenderLinks(DrawingContext ctx)
             // or whose destination node is inlined (value shown in hook row instead).
             if (link.Destination is null) continue;
             if (link.Destination is NodeViewModel destNvm && destNvm.IsInlined) continue;
+
+            // Check if the destination's underlying model belongs to the current boundary.
+            // Using ContainedWithin (rather than collection membership) keeps undo working:
+            // after an undo the boundary manager creates a fresh ViewModel for the returned
+            // node, so the stale VM in link.Destination is no longer in the Nodes collection
+            // but its UnderlyingNode.ContainedWithin is updated back to the current boundary.
+            bool destinationInCurrentView = link.Destination switch
+            {
+                NodeViewModel nvm            => nvm.UnderlyingNode.ContainedWithin            == _vm.CurrentBoundary,
+                StartViewModel svm           => svm.UnderlyingStart.ContainedWithin           == _vm.CurrentBoundary,
+                GhostNodeViewModel gvm       => gvm.UnderlyingGhostNode.ContainedWithin       == _vm.CurrentBoundary,
+                FunctionInstanceViewModel fivm => fivm.UnderlyingInstance.ContainedWithin     == _vm.CurrentBoundary,
+                FunctionParameterViewModel fpvm => fpvm.UnderlyingParameter.ContainedWithin   == _vm.CurrentBoundary,
+                _ => false
+            };
+            if (!destinationInCurrentView) continue;
 
             bool isDisabled = link.UnderlyingLink.IsDisabled;
             var brush = link.IsSelected

src/XTMF2.GUI/Views/TypePickerDialog.axaml.cs

@@ -276,6 +276,10 @@ public TypePickerDialog(
                 {
                     TypeListBox.SelectedIndex = idx;
                     TypeListBox.ScrollIntoView(TypeListBox.SelectedItem!);
+                    // Explicitly call OnListSelectionChanged to ensure CanOK is updated.
+                    // This is needed because if the item is already at the selected index,
+                    // SelectionChanged won't fire.
+                    OnListSelectionChanged();
                 }
             }
         };
@@ -357,6 +361,7 @@ private void UpdateFilter()
 
         FilteredTypes = new ObservableCollection<Type>(source);
         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(HasNoResults)));
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(CanOK)));
 
         // Keep the list box in sync — auto-select first match.
         if (FilteredTypes.Count > 0)