What does this MR do?
Debounces GfmAutoComplete.setup.
Why was this MR needed?
See https://gitlab.com/gitlab-org/gitlab-ce/issues/22704
Major lag on MR screens with many diff notes.
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
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 you do - rebase it please) -
Squashed related commits together