svoid addAWTEventListener_inFront(AWTEventListener listener, long eventMask) {
  if (listener == null) ret;
  swing {
    var tk = awtToolkit();
    EventListener[] otherListeners = tk.getAWTEventListeners();
    
    new LPair<AWTEventListener, Long> listenersWithMask;
    
    fOr (var l : otherListeners)
      if (l cast AWTEventListenerProxy) {
        listenersWithMask.add(pair(l.getListener(), l.getEventMask()));
      } else {
        warn("Can't get event listener mask: " + l);
        ret;
      }

    fOr (var l : listenersWithMask)
      tk.removeAWTEventListener(l.a);
    tk.addAWTEventListener(listener, eventMask);
    fOr (var l : listenersWithMask)
      tk.addAWTEventListener(l.a, l.b);
  }
}

Began life as a copy of #1032112