static JInternalFrame addInternalFrame(final JDesktopPane desktop, fS title, final int x, final int y, final int w, final int h) {
  ret swing(func -> JInternalFrame {
    JInternalFrame frame;
    desktop.add(setBounds(x, y, w, h, frame = jInternalFrame(title)));
    frame.setSelected(true);
    ret fixInternalFrame(frame);
  });
}

static JInternalFrame addInternalFrame(final JDesktopPane desktop, fS title, final Component contents) {
  ret swing(func -> JInternalFrame {
    JInternalFrame frame = jInternalFrame(title);
    setInternalFrameContents(frame, contents);
    internalFrameDefaultPosition(frame, title);
    desktop.add(frame);
    frame.setSelected(true);
    ret fixInternalFrame(frame);
  });
}