private static List<UsageInfo> findRefs(final PsiElement aClass, GlobalSearchScope searchScope) {
    List<UsageInfo> results = new ArrayList<>();
    for (PsiReference usage : ReferencesSearch.search(aClass, searchScope, false)) {
      results.add(new UsageInfo(usage));
    }

    results.sort(Comparator.<UsageInfo, String>comparing(u -> {
      VirtualFile file = u.getVirtualFile();
      return file == null ? null : file.getName();
    }).thenComparingInt(u->{
      Segment range = u.getNavigationRange();
      return range == null ? 0 : range.getStartOffset();
    }));
    return results;
  }
private static List<UsageInfo> findRefs(final PsiElement aClass, GlobalSearchScope searchScope)