private static void mergeCommentLists(List<CommentRange> target, List<CommentRange> source) {
    List<CommentRange> merged = target.isEmpty()
                                ? source
                                : ContainerUtil.mergeSortedLists(target, source, CommentRange.BY_START_OFFSET_THEN_BY_END_OFFSET, true);
    target.clear();
    target.addAll(merged);
  }
private static void mergeCommentLists(List<CommentRange> target, List<CommentRange> source)