Hm I don't see a difference on Windows related to the panel flashing, also compared to 83, unfortunately it opens and closes due to composition starting and ending. That may require a separate bug.
Bug 1673669 Comment 22 Edit History
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Hm I don't see a difference on Windows related to the panel flashing, also compared to 83, unfortunately it opens and closes due to composition starting and ending. That may require a separate bug. I'll do some testing on Mac and see what I can find.