allowing unfocusing the editor field by keyboard for accessibility

[KiaraGrouwstra]

Is your feature request related to a problem? Please describe.
It would be nice to use this editor by keyboard, but currently codemirror 5's rebinding of the tab key makes this harder, as reported at go-gitea/gitea#20752.

Describe the solution you'd like
Ensure the tab key functions as normal (at least outside of markdown lists).
This could perhaps be achieved by patching codemirror, so as to not require a broader upgrade.

Describe alternatives you've considered
Having this repo update to codemirror 6 (#324 / #505). This appears to require a larger rewrite (#447), making it less viable as a short-term fix.

Additional context
Would you perhaps take PRs for this?
(I'm seeing there's some open ones still as well. Is there a plan for maintainership for this repo?)

[Ionaru]

Would you perhaps take PRs for this?

I do accept pull requests, the ones that are currently open either have a stalled discussion or I haven't gotten around to testing the functionality.

[mrdavidlaing]

Any update on this issue?

Is specific; I'm wondering what prevented #518 from being merged.

Thanks!