static ActionListener actionListenerInNewThread(fO runnable) {
  ret actionListenerInNewThread(runnable, null);
}

static ActionListener actionListener(fO runnable, fO instanceToHold) {
  if (runnable instanceof ActionListener) ret (ActionListener) runnable;
  ret actionListener {
    temp holdInstance(instanceToHold);
    callFInNewThread(runnable);
  };
}