private Set<PsiFile> getSelectedScope(Object[] nodes) {
    if (nodes == null ) return EMPTY_FILE_SET;
    Set<PsiFile> result = new HashSet<>();
    for (Object n : nodes) {
      ((PackageDependenciesNode)n).fillFiles(result, !mySettings.UI_FLATTEN_PACKAGES);
    }
    return result;
  }
private Set<PsiFile> getSelectedScope(Object[] nodes)