Kind of a separate issue, but probably with the same root cause (layout problems).

1. Vector 2022.
2. Open JS editor.
3. Resize your browser (!) window to half of the screen (so that editor is thinner then normal). You can do that by opening devtools.
4. Resize the code editor with the editor resizer.
5. Change browser window again (make it wider).

What happens?:

So as seems width becomes fixed and so the editor is broken. No way to change except by manually removing width:... from the ui-resizable element.

A similar problem occurs when you start with wide window, use editor resizer, make the window smaller. Only then code is clipped, and you won't be able to see all of it.

Since (realtime)Preview for edits of *.js/*.css doesn't have any use anyway (the js/css isn't executed/applied [or is it?]), I think that feature could be disabled in case of such files.

Realtime Preview is already only loaded for wikitext pages, but on plwiki it's loading for all content types because it's a gadget. This will be resolved once it's no longer a gadget (T303961 is tracking when that'll happen).

T204201 is the task for adding contentmodel-specific gadget loading, but we don't need to worry about that I think.

Change 804273 had a related patch set uploaded (by Samwilson; author: Samwilson):

[mediawiki/extensions/WikiEditor@master] Realtime preview: allow loading as a gadget

https://gerrit.wikimedia.org/r/804273

Change 804273 merged by jenkins-bot:

[mediawiki/extensions/WikiEditor@master] Realtime preview: allow loading as a gadget

https://gerrit.wikimedia.org/r/804273

The CodeEditor resize now works on beta wikisource, where RTP is loaded as a gadget. See, for example, https://en.wikisource.beta.wmflabs.org/w/index.php?title=MediaWiki:Common.js/watchlist.js&action=edit.