@Override
	public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
    }
This method is called before the popup menu becomes visible 
@see javax.swing.event.PopupMenuListener#popupMenuWillBecomeVisible(javax.swing.event.PopupMenuEvent)
Ghidra/Framework/Docking/src/main/java/docking/menu/MenuHandler.java