1. Make fomantic build use [our
browserslist](e3524c63d6/package.json (L99)).
I found no other way than to sed-replace into it's js, the normal
browserlist config files do not work. The effect of this change is the
removal of some uneeded CSS vendor prefixes.
2. Regenerate `web_src/fomantic/package-lock.json`, this might shut up
some security scanners.
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Co-authored-by: Giteabot <teabot@gitea.io>
It causes not only one issue like #25221 (the footer width was also
affected by that change and was fixed some time ago)
The problem of "overflow: overlay" (#21850) is:
* It's not widely supported and is non-standard
https://caniuse.com/css-overflow-overlay
* It's not widely tested in Gitea (some standard layout like `ui
container + ui grid` may break it).
* The benefit seems smaller than the problems it brings.
So, I think it is good to revert it.
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Let's leave enough time for testing and reviewing.
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Co-authored-by: Giteabot <teabot@gitea.io>
Co-authored-by: silverwind <me@silverwind.io>
