@Override
  protected @NotNull String getRollbackProposal() {
    return new HtmlBuilder()
      .append(
        GitBundle.message("merge.operation.however.merge.has.succeeded.for.the.following.repositories", getSuccessfulRepositories().size()))
      .br()
      .appendRaw(successfulRepositoriesJoined())
      .br()
      .append(GitBundle.message("merge.operation.you.may.rollback.not.to.let.branches.diverge")).toString();
  }
@Override
  protected @NotNull String getRollbackProposal()