svoid stackWindowsUpwardsInBottomRightCorner(L<? extends JComponent> l) {
  L<Window> windows = map getWindow(l);
  if (empty(windows)) ret;
  moveToBottomRightCorner(first(windows));
  int yGap = 20;
  for (Pair<Window> p : listToOverlappingPairs(windows)) {
    Rect ra = toRect(getBounds(p.a));
    Rect rb = toRect(getBounds(p.b));
    setBounds(p.b, ra.x2()-rb.w, ra.y-yGap-rb.h, rb.w, rb.h);
  }
}