@Override
    public void documentChanged(@NotNull DocumentEvent e) {
      if (StringUtil.indexOf(e.getOldFragment(), '\n') != -1 ||
          StringUtil.indexOf(e.getNewFragment(), '\n') != -1) {
        for (int i = 0; i < myCount; i++) {
          if (myEditors[i].getDocument() == e.getDocument()) {
            myShouldUpdateLineNumbers[i] = true;
          }
        }
      }
    }
@Override
    public void documentChanged(@NotNull DocumentEvent e)