sbool jlist_doubleClickOnItem(final JList l, final int idx) {
  ret l != null && swing(func -> bool {
    Rect r = jlist_itemBounds(l, idx);
    if (r == null) false;
    
    long time = now();
    int x = rectCenterX(r), y = rectCenterY(r);
    MouseEvent press   = new(l, MouseEvent.MOUSE_PRESSED,  time, 0, x, y, 2, false, MouseEvent.BUTTON1);
    MouseEvent release = new(l, MouseEvent.MOUSE_RELEASED, time, 0, x, y, 2, false, MouseEvent.BUTTON1);
    MouseEvent click   = new(l, MouseEvent.MOUSE_CLICKED,  time, 0, x, y, 2, false, MouseEvent.BUTTON1);

   l.dispatchEvent(press);
   l.dispatchEvent(release);
   l.dispatchEvent(click);
   true;
  });
}