fix: Popup cannot display empty names and items with the same name properly, add HashCode to display them

Author: SolarianZ

Editor/Scripts/Window/PlayableGraphMonitorWindow_Toolbar.cs

@@ -173,7 +173,8 @@ private string GraphPopupFieldFormatter(PlayableGraph graph)
         {
             if (graph.IsValid())
             {
-                return graph.GetEditorName();
+                // Popup cannot display empty names and items with the same name properly, add HashCode to display them
+                return $"{graph.GetEditorName()} <{graph.GetHashCode()}>";
             }
 
             return "No PlayableGraph";
@@ -349,4 +350,4 @@ private void OnHoverSelectRootNodeMenu(PointerEnterEvent evt)
             }
         }
     }
-}
+}