Focus visible looks funny on headings

[max-nextcloud]

Describe the bug
When focusing a heading it has a box around it with a little square at the lower left to make room for the # anchor:

To Reproduce
Steps to reproduce the behavior:

1. Go to a text file with headings
2. Focus one of the headings
3. See highlighting with funny shape

Expected behavior
I did not expect this to be highlighted at all - but i guess that's for accessibility reasons. If highlighted i would expect this to only have a clear rectangle around the heading itself.

[susnux]

Does this happens only in a specific browser? Because for me it looks correct using Firefox 104:

Edit: I can reproduce this using Chrome.
Looks like we do not set any focus-visible styling, so the browser default is used, this is why this only affects Chrome.

[max-nextcloud]

Yes... I was seeing this in chrome as well. Thanks a lot for looking into this @susnux!