static <A extends Component> A onFrameIconified(A c, fO r) {
  if (c != null) swing {
    JFrame f = getFrame(c);
    if (f != null)
      f.addWindowListener(new WindowAdapter {
        public void windowIconified(WindowEvent e) {
          temp tempRememberListener(f, 'removeWindowListener, this);
          pcallF(r);
        }
      });
  }
  ret c;
}