public void writeExternal(@NotNull final Element parentNode) {
    // restore old breakpoints
    for (Element group : myOriginalBreakpointsNodes.values()) {
      Element clone = group.clone();
      if (clone.getAttribute(CONVERTED_PARAM) == null) {
        clone.setAttribute(CONVERTED_PARAM, "true");
      }
      parentNode.addContent(clone);
    }
  }
public void writeExternal(@NotNull final Element parentNode)