static JFrame makeUndecoratedFrame(S title, O content) {
  ret swing(() -> {
    JFrame frame = new JFrame(title);
    frame.setUndecorated(true);
    Component wrapped = wrap(content);
    if (wrapped != null)
      frame.getContentPane().add(wrapped);
    frame.setBounds(defaultNewFrameBounds());
    ret frame;
  });
}

Began life as a copy of #1000921