done (as well as reverting the pre-forked behavour for non-fork MR's)

```ruby
  def unmerged_commits
    if for_fork?
      commits = Gitlab::Satellite::MergeAction.new(self.author, self).commits_between
    else
      commits = self.project.repository.commits_between(self.target_branch, self.source_branch)
    end
    if commits.present?
      commits = Commit.decorate(commits).
      sort_by(&:created_at).
      reverse
    end
    commits
  end

```