Feedback on moving merge request navigation tabs to the top
## Objective **The aim of this issue is to gather feedback on the recent change of moving the merge request navigation tabs to the top, as explained in this [blog post](https://about.gitlab.com/blog/2019/12/22/gitlab-12-6-released/#more-easily-navigate-between-tabs-within-merge-requests).** Any kind of feedback is welcome. ## Background Previously, merge request navigation tabs were located in the middle of the page, below the description and merge widget, which meant it could be in a different place from merge request to merge request. This has surfaced as sub-optimal in interviews with multiple customers, and in investigating https://gitlab.com/gitlab-org/gitlab/issues/27600, https://gitlab.com/gitlab-org/gitlab/issues/31300, and https://gitlab.com/gitlab-org/gitlab-foss/issues/62536. To provide more predictable and easy to find navigation within a merge request, and to provide greater focus in each area of the merge request, in https://gitlab.com/gitlab-org/gitlab/issues/33813 we: * Moved the merge request navigation tabs above the description and merge widget. * Are now showing the description and merge widget in a new **Overview** tab (replacing the “Discussions” tab). Since [recent user testing](https://gitlab.com/gitlab-org/ux-research/issues/341) of these changes was very positive, we decided to roll them out to all GitLab.com users. On self-managed instances, these changes are behind a feature flag that can be toggled on/off for all users — [How can I disable these changes?](https://docs.gitlab.com/ee/user/project/merge_requests/#merge-request-navigation-tabs-at-the-top)
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