static new ThreadLocal<Bool> addInternalFrame_dontSelect;

static JInternalFrame addInternalFrame(final JDesktopPane desktop, fS title, final int x, final int y, final int w, final int h) {
  ret addInternalFrame(desktop, title, x, y, w, h, null);
}

static JInternalFrame addInternalFrame(final JDesktopPane desktop, fS title, final int x, final int y, final int w, final int h, final Component contents) {
  ret swing(func -> JInternalFrame {
    JInternalFrame frame = jInternalFrame(title);
    if (contents != null) setInternalFrameContents(frame, contents);
    desktop.add(setBounds(x, y, w, h, frame));
    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);
    desktop.add(frame);
    internalFrameDefaultPosition(frame);
    if (!isTrue(addInternalFrame_dontSelect!))
      frame.setSelected(true);
    ret fixInternalFrame(frame);
  });
}

static JInternalFrame addInternalFrame(JDesktopPane desktop, S title) {
  ret addInternalFrame(desktop, title, jpanel());
}