Enable single file review mode from the MR Changes tab
Problem to solve
The recently shipped feature of reviewing File by file in MRs !35223 (merged) is buried in the User preferences (https://gitlab.com/profile/preferences).
Users should be able to toggle it on and off from the MR page itself.
Intended users
All users of MRs.
User experience goal
Easily toggle on and off the preference.
Proposal
Further details
While we have the feature flag, this needs to be tied to the same feature flag.
Another detail:
- What should we do with the User preference in the settings? Keep these two places always in sync? Or remove it from the user settings?
Documentation
An update to this section is in order: https://docs.gitlab.com/ee/user/project/merge_requests/reviewing_and_managing_merge_requests.html#file-by-file-diff-navigation
Availability & Testing
What does success look like, and how can we measure that?
Links / references
See Epic for related work: &516
Release Notes
Using single-file diff mode is useful to improve performance and navigation of large merge requests, however, enabling it previously meant leaving the merge request, going into user preferences, and enabling the option.
This releases introduces the capability to enable single-diff mode right within the merge request view. As you navigate to the "changes" tab of the merge request, simply click the gear icon and check the box labeled Display one file at a time. This will display a single file at a time and enable the prev and next buttons to navigate among files.