static <A extends Component> A packInternalFrameVertically(A c) {
  ret packInternalFrameVertically(-1, c);
}

static <A extends Component> A packInternalFrameVertically(int width, A c) {
  final JInternalFrame win = getInternalFrame(c);
  if (win == null) ret c;
  final int w = width < 0 ? win.getWidth() : width;
  swing {
    win.pack();
    win.setSize(w, win.getHeight());
    fixInternalFrame(win);
  }
  ret c;
}