@Override
    public void keyPressed(KeyEvent event) {
      if (event.isConsumed()) return; // already processed
      if (0 != event.getModifiers()) return; // modifier pressed
      if (KeyEvent.VK_ESCAPE != event.getKeyCode()) return; // not ESC
      boolean[] copied = new boolean[1];
      PsiCopyPasteManager manager = getInstance();
      if (manager.getElements(copied) == null) return; // no copied element
      if (copied[0]) return; // nothing is copied
      manager.clear();
      event.consume();
    }
@Override
    public void keyPressed(KeyEvent event)