QT window redraw errors continue

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My fully up-to-date Manjaro Plasma Wayland pc (kernel 6.1.67 lts) stills has these redraw problems. See image in the linked post:

Continuing the discussion from Calibre rendering issues in Wayland:

This is not only Calibre, also with Transmission. (Replies in the nature of “I don’t have problems with this” do not help).

I remember from some other issues that only a few people recognized, the solution was to delete some configuration files. Thereby forcing the system to re-create that configuration.

My question is: which files probably somewhere in the Home directory would be candidate for this?

Thanks!

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If an application has issues - this is a task for the developer(s) of said application.

Manjaro does not fix upstream issues - so better file a bug report with the relevant source.

Most configuration files reside in ~/.config/<application-name>

If there is a general problem it may be a GPU issue - e.g. shared memory.

Such memory issues may stem from a flaky memory module and that can be hard to pin down.

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They do, because if numerous other users don’t have an issue then it indicates that the problem is something specific to your system.

Create a new user and login on that. Can you replicate the issue there?

NO - The problem is with your user configuration. If you have a custom theme that is the #1 suspect. See also https://wiki.archlinux.org/title/KDE#Configuration_related

YES - Post output of inxi -Fazy so people trying to help can see details of your system

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Thanks for the link to the arch wiki. maybe HiDPI - ArchWiki.
Added these variables to the environment:
$ export QT_AUTO_SCREEN_SCALE_FACTOR=1
$ export QT_ENABLE_HIGHDPI_SCALING=1

again, so far so good.