@Nullable
  @Override
  public ChangeDiffRequestChain.Producer createDiffWithLocalRequestProducer(@Nullable Project project, boolean useBeforeVersion) {
    if (useBeforeVersion || project == null) return null;
    return DiffShelvedChangesActionProvider.createDiffProducer(project, this, true);
  }
@Nullable
  @Override
  public ChangeDiffRequestChain.Producer createDiffWithLocalRequestProducer(@Nullable Project project, boolean useBeforeVersion)