static int fixInternalFrame_borderTopLeft = 0;
static int fixInternalFrame_borderBottomRight = 40;

static JInternalFrame fixInternalFrame(JInternalFrame f) {
  Container c = f.getParent();
  if (c == null) ret f;
  Rect r = toRect(f.getBounds());
  int a = fixInternalFrame_borderTopLeft, b = fixInternalFrame_borderBottomRight;
  Rect outer = new Rect(a, a, c.getWidth()-b, c.getHeight()-b);
  if (!rectsIntersect(r, outer))
    f.setLocation(
      max(b, min(r.x, outer.x2())),
      max(b, min(r.y, outer.y2())));
  ret f;
}