static JFrame renewFrame(final JFrame frame) {
  ret (JFrame) swing(func {
    Container root = frame.getRootPane();
    JFrame frame2 = new JFrame(frame.getTitle());
    frame2.setBounds(frame.getBounds());
    frame.setRootPane(new JPanel);
    frame2.setRootPane(root);
    ret frame2;
  });
}