@NotNull
  DiffViewerWrapper process(@NotNull ChangeDiffRequestProducer presentable,
                            @NotNull UserDataHolder context,
                            @NotNull ProgressIndicator indicator) throws DiffRequestProducerException, ProcessCanceledException;
@NotNull
  DiffViewerWrapper process(@NotNull ChangeDiffRequestProducer presentable,
                            @NotNull UserDataHolder context,
                            @NotNull ProgressIndicator indicator)