Add auto-scrolling to dropdown vue component during keyboard navigation
What does this MR do and why?
Updates the Vue.js SuggestionsDropdown component used in the wiki markdown editor to automatically update scroll position when using keyboard navigation. Mimics the behavior of the similar jquery-based suggestion dropdown that exists in e.g. the issues editor.
Screenshots or screen recordings
Screen_Recording_2022-10-19_at_4.49.11_PM
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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Related to #377673 (closed)