Windows menu retains reference to removed stages

[brucejohnson]

I've had a problem recently where the video memory of canvases in my JavaFX stages is not released when I remove the stage and I run out of memory.
The problem goes away if I remove (along with a few other things in my code) the use of autoAddWindowMenuItems for the Window menu.

I think the problem is from the following methods in WindowMenuUpdateListener.

addWindowMenuItem adds a reference to the stage in createdMenuItems, but removeWindowMenuItem doesn't remove it.
So even though you remove the stage it isn't properly garbage collected as there is still a reference to it.

private void removeWindowMenuItem(Stage stage, Menu menu) {
	MenuItem menuItem = createdMenuItems.get(stage);
	if (menuItem != null) {
               menu.getItems().remove(menuItem);
           }
}

private void addWindowMenuItem(Stage stage, Menu menu) {
	CheckMenuItem item = new CheckMenuItem(stage.getTitle());
	item.setOnAction(event -> stage.toFront());
	createdMenuItems.put(stage, item);
	menu.getItems().add(item);
}