public @Nullable CharSequence getBaseRevision(@NotNull String relativeFilePath) {
    final Map<String, Map<String, CharSequence>> map = myAdditionalInfoParser.getResultMap();
    if (!map.isEmpty()) {
      final Map<String, CharSequence> inner = map.get(relativeFilePath);
      if (inner != null) {
        BaseRevisionTextPatchEP baseRevisionTextPatchEP = PatchEP.EP_NAME.findExtensionOrFail(BaseRevisionTextPatchEP.class);
        return inner.get(baseRevisionTextPatchEP.getName());
      }
    }
    return null;
  }
public @Nullable CharSequence getBaseRevision(@NotNull String relativeFilePath)