Memory Leak in (Context)Menu

Our use case: when a ContextMenu is shown, we load asynchronously some items and then populate the ContextMenu.

During loading we show a fix MenuItem with a ProgressIndicator in it.
There is also another fix SeperatorMenuItem.

We figured out, that there are memory leaks, though. (Everytime we clear and add the menuitem).

See also here:
https://forums.oracle.com/forums/thread.jspa?threadID=2407497&tstart=0
Quote: "I believe that the problem is related to the javafx.beans.InvalidationListener not cleaning up it's link to the javafx.scene.control.skin.ContextMenuContent$MenuItemContainer."

Here is a simple test case.


import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;
 
public class MemoryLeakTest2 extends Application {
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage stage) throws Exception {
        VBox root = new VBox();
 
        final ContextMenu menu = new ContextMenu();
        Button button = new Button("Test");
        button.setContextMenu(menu);
        root.getChildren().add(button);
        final MenuItem menuItem1 = new MenuItem("Test");
 
        menu.getItems().add(menuItem1);
 
        menu.setOnShown(new EventHandler<WindowEvent>() {
            @Override
            public void handle(WindowEvent windowEvent) {
                for (int i = 0; i < 100; i++) {
                    menu.getItems().clear();
                    menu.getItems().add(menuItem1);
                }
                System.gc();
                System.out.println((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 + " KB");
            }
        });
 
 
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.show();
    }
}