Update INotifyCollectionChanged events in MenuItems and FooterMenuItems of the NavigationView

src/Wpf.Ui/Controls/NavigationView/NavigationView.Properties.cs

@@ -450,6 +450,49 @@
         set => SetValue(FrameMarginProperty, value);
     }
 
+    private void OnMenuItemsSource_CollectionChanged(object? sender, IList collection, NotifyCollectionChangedEventArgs e)
+    {
+        if (ReferenceEquals(sender, collection))
+        {
+            return;
+        }
+
+        switch (e.Action)
+        {
+            case NotifyCollectionChangedAction.Add:
+                foreach (var item in e.NewItems)
+                {
+                    collection.Add(item);
+                }
+                break;
+
+            case NotifyCollectionChangedAction.Remove:
+                foreach (var item in e.OldItems)
+                {
+                    if (!e.NewItems.Contains(item))
+                    {
+                        collection.Remove(item);
+                    }
+                }
+                break;
+
+            case NotifyCollectionChangedAction.Move:
+                var moveItem = MenuItems[e.OldStartingIndex];
+                collection.RemoveAt(e.OldStartingIndex);
+                collection.Insert(e.NewStartingIndex, moveItem);
+                break;
+
+            case NotifyCollectionChangedAction.Replace:
+                collection.RemoveAt(e.OldStartingIndex);
+                collection.Insert(e.OldStartingIndex, e.NewItems[0]);
+                break;
+
+            case NotifyCollectionChangedAction.Reset:
+                collection.Clear();
+                break;
+        }
+    }
+
     private void OnMenuItems_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
     {
         if (e.NewItems is null)
@@ -481,6 +524,11 @@
         {
             navigationView.MenuItems.Add(e.NewValue);
         }
+
+        if (e.NewValue is INotifyCollectionChanged oc)
+        {
+            oc.CollectionChanged += (s, e) => navigationView.OnMenuItemsSource_CollectionChanged(oc, navigationView.MenuItems, e);
+        }
     }
 
     private void OnFooterMenuItems_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
@@ -517,6 +565,11 @@
         {
             navigationView.FooterMenuItems.Add(e.NewValue);
         }
+
+        if (e.NewValue is INotifyCollectionChanged oc)
+        {
+            oc.CollectionChanged += (s, e) => navigationView.OnMenuItemsSource_CollectionChanged(oc, navigationView.FooterMenuItems, e);
+        }
     }
 
     private static void OnPaneDisplayModeChanged(DependencyObject? d, DependencyPropertyChangedEventArgs e)