Review "Suggest changes" - in GitLab 11.6
https://docs.gitlab.com/ce/user/discussions/#suggest-changes
As a reviewer, you’re able to suggest code changes with a simple Markdown syntax in Merge Request Diff threads.
Then, the Merge Request author (or other users with appropriate permission) is able to apply these suggestions with
a click, which will generate a commit in the Merge Request authored by the user that applied them.
Just to track this feature for heptapod (I know there's quite a road to 11.6).