@NotNull
  private RecursiveFilePathSet removeAncestorsRecursive(@Nullable RecursiveFilePathSet dirs) {
    RecursiveFilePathSet result = newRecursiveFilePathSet();
    if (dirs == null) return result;

    List<FilePath> paths = ContainerUtil.sorted(dirs.filePaths(), Comparator.comparingInt(it -> it.getPath().length()));
    for (FilePath path : paths) {
      if (result.hasAncestor(path)) continue;
      result.add(path);
    }
    return result;
  }
@NotNull
  private RecursiveFilePathSet removeAncestorsRecursive(@Nullable RecursiveFilePathSet dirs)