Hi @Msz2001, thanks for taking the time to report this!

I can reproduce on https://pl.wikipedia.org/w/index.php?title=Pandemia_COVID-19&action=edit&useskin=vector-2022&safemode=1

This might be the same underlying reason as T314019: Wrong content width for Vector-2022 skin layout if extra-wide elements are used (about viewing but not editing wide tables or wide images).

Hi thanks for the report! I'm struggling to replicate this one in an incognito window on Edge emulator on either Andre's link or the original link.
{F35399123}

Do I need to be logged in and have certain preferences enabled?

It appears that the issue happens only for logged-in users. No changes to preferences are needed.

This looks like an issue with the grid being set to size 'min-content' and then the content not having a max-width. Much of the content assumes that their containers are the restriction, so setting the container to be unrestricted seems problematic.

https://pl.wikipedia.org/w/index.php?title=Wikipedysta:Ksi%C4%99%C5%BCycowy_Zaj%C4%85c/brudnopis&action=edit&oldid=67755432&safemode=true&useskin=vector-2022

Edit: If I disable this grid template, its fixed

@media screen and (min-width: 1200px)
.vector-layout-grid .mw-page-container-inner {
    grid-template-columns: 284px 20px 1fr;
}

It should probably be:

grid-template-columns: 284px 20px minmax(0,1fr);

And god... didn't know that grid was that unreadable... what a pain to debug.
We should add a Readme.md to the skin's resources directory with an explanation of the grid design I think.

This problem is described quite well in https://css-tricks.com/preventing-a-grid-blowout/

TLDR: Let's add min-width: 0; to .mw-content-container.
Thanks for reporting this one!

This is a more general issue. We'll use https://phabricator.wikimedia.org/T314756 to do the work and move this back into QA when needed.

Fixed by T314756.