static JFrame renewFrame(final JFrame frame) {
  if (frame == null) null;
  ret (JFrame) swing(func {
    Container content = frame.getContentPane();
    JFrame frame2 = makeFrame(frame.getTitle());
    frame2.setBounds(frame.getBounds());
    pcall { frame2.setIconImages(frame.getIconImages()); }
    frame2.setDefaultCloseOperation(frame.getDefaultCloseOperation());
    bool active = isActiveFrame(frame);
    frame2.setAutoRequestFocus(active);
    for (WindowListener wl : frame.getWindowListeners())
      frame2.addWindowListener(wl);
    frame.setContentPane(new JPanel);
    frame2.setContentPane(content);
    frame2.setVisible(true);
    frame.dispose();
    ret frame2;
  });
}