When Repository File Tree Browser is closed it should not be accessible to user navigation
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Context
We need to find a way to remove/re-insert the FTB in an efficient and performant way without harming the CSS animations.
This is a better alternative than keeping it in and then dealing with the side-effects (ie, focus, etc.).
Keyboard Navigation Issue
@psjakubowska identified an accessibility issue in this comment:
Apart from restoring the focus, we should also block the access to the FTB when it's collapsed. Similar that is done with modals. I was able to tab through the FTB and fill in the filter bar, while it was collapsed.
Screen_Recording_2025-09-19_at_16.39.08
File tree browser is still interactive-able when collapsed
@brendan777 noticed, shortcut and search are still working when file tree browser is collapsed
Screen Recording Oct 5 2025 from GitLab.mov
Tooltip does not disappear
@alyssatrinh noted, when users close the file tree browser, the Show file tree browser tooltip is still lingering. #537970 (comment 2851725820)