// menuMaker = voidfunc(JPopupMenu)
static void internalFrameTitlePopupMenu(final JInternalFrame f, fO... params) {
  swing {
    O menuMaker;
    if (l(params) == 1 && !(params[0] instanceof JMenu))
      menuMaker = params[0];
    else
      menuMaker = voidfunc(JPopupMenu menu) { addMenuItems(menu, params) };
    
    Component titleComponent = getInternalFrameTitlePaneComponent(f);
    if (!titleComponent instanceof JComponent)
      print("Can't add internal frame title popup menu!");
    else {
      componentPopupMenu((JComponent) titleComponent, menuMaker);
      setOpt(componentPopupMenu_initForComponent((JComponent) titleComponent), internalFrameLeftButtonMagic := isTrue(vm_generalMap_get('internalFramePopupOnLeftButton)));
    }
      
    // Also add to the frame so we can show the items e.g. in a JFrame menu
    componentPopupMenu(f, menuMaker);
  }
}

Began life as a copy of #1005777