Replaced duplicate z-index with index of 400
What does this MR do?
Adds z-index 400 to header to stop the user dropdown showing underneath the sidebar.
This issue isn't actually present on CE, but this is the backport from EE.
CE port of: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1938
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master
(if it does - rebase it please) -
Squashed related commits together
What are the relevant issue numbers?
Edited by Luke Bennett