Add headers to files in the tree list on merge requests
What does this MR do?
Adds headers to files in the tree list on merge requests. Headers are added to file groups & stick to the top when scrolling. Headers get truncated in the middle when the character count is past a set number.
What are the relevant issue numbers?
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54807
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Tested in all supported browsers -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process. -
Security reports checked/validated by reviewer
Edited by Phil Hughes