private static @Nls @NotNull String toString(@Nullable VcsFileRevision revision) {
      if (!(revision instanceof SvnFileRevision)) return "";
      return join(((SvnFileRevision)revision).getMergeSources(), it -> getRevisionNumberWithMergeMark(it), ", ");
    }
private static @Nls @NotNull String toString(@Nullable VcsFileRevision revision)