Fix UI size changes when saving scenes or prefabs in Editor with different layout

Source/Editor/Windows/Assets/PrefabWindow.cs

@@ -355,6 +355,8 @@ namespace FlaxEditor.Windows.Assets
 
             try
             {
+                Editor.Scene.OnSaveStart(_viewport);
+
                 // Simply update changes
                 Editor.Prefabs.ApplyAll(_viewport.Instance);
 
@@ -371,6 +373,10 @@ namespace FlaxEditor.Windows.Assets
 
                 throw;
             }
+            finally
+            {
+                Editor.Scene.OnSaveEnd(_viewport);
+            }
         }
 
         /// <inheritdoc />