static int fixInternalFrame_border = 20;

static JInternalFrame fixInternalFrame(JInternalFrame f) {
  Container c = f.getParent();
  if (c == null) ret f;
  Rect r = toRect(f.getBounds());
  int b = fixInternalFrame_border;
  Rectangle outer = shrinkRect(new Rect(0, 0, c.getWidth(), c.getHeight(), b);
  if (!rectsIntersect(r, outer))
    f.setLocation(
      max(b, min(r.x, outer.x)),
      max(b, min(r.y, outer.y)));
  ret f;
}