fix(dock): fix Element is already the child of another element exception

src/Editor/Ghost.Editor/View/Controls/DockLayout.Rendering.cs

@@ -11,6 +11,7 @@ public sealed partial class DockLayout
     {
         if (GetTemplateChild(PART_ROOT_GRID) is Grid rootGrid)
         {
+            DisconnectUI(rootGrid);
             rootGrid.Children.Clear();
             if (Root != null)
             {
@@ -20,6 +21,21 @@ public sealed partial class DockLayout
         }
     }
 
+    private void DisconnectUI(UIElement element)
+    {
+        if (element is Ghost.Editor.Controls.NavigationTabView tabView)
+        {
+            tabView.TabItemsSource = null;
+        }
+        else if (element is Panel panel)
+        {
+            foreach (var child in panel.Children)
+            {
+                DisconnectUI(child);
+            }
+        }
+    }
+
     private UIElement CreateUIForNode(DockNode node)
     {
         if (node is DockGroupNode groupNode)