@Nullable
  private static @NlsContexts.Label String createDiffContentTitle(int index, @NotNull BlockData data) {
    if (index >= data.getRevisions().size()) return null;
    return VcsBundle.message("diff.content.title.revision.number", data.getRevisions().get(index).getRevisionNumber());
  }
@Nullable
  private static @NlsContexts.Label String createDiffContentTitle(int index, @NotNull BlockData data)