@Nullable
  private static Pair<FilePath, VcsRevisionNumber> getRevisionInfo(@NotNull VcsFileRevision revision) {
    if (revision instanceof VcsFileRevisionEx) {
      return Pair.create(((VcsFileRevisionEx)revision).getPath(), revision.getRevisionNumber());
    }
    return null;
  }
@Nullable
  private static Pair<FilePath, VcsRevisionNumber> getRevisionInfo(@NotNull VcsFileRevision revision)