[dolphin] [Bug 503075] Thumbnails for text/plain files become posterised ≤ 22 px

[Roke Julian Lockhart Beedell]

https://bugs.kde.org/show_bug.cgi?id=503075

--- Comment #5 from Roke Julian Lockhart Beedell <4wy78uwh at rokejulianlockhart.addy.io> ---
> Does it resolve itself after F5 ?

No.

> Does it happen in any folders ?

Yes. However, whilst evaluating this, I realised that there is another
component to the problem:

If I *duplicate* my `$HOME/.bash_history` to another directory (I've tested
`$HOME/Documents`), the problem remains. However, when I create a new file, the
problem does not reproduce. Even more strangely, if I modify the aforementioned
duplicate (at `$HOME/Documents/.bash_history`), the thumbnail recomputes, yet
remains posterised. Consequently, the size of the file may matter.

> Did you reboot or kill all your dolphin instances after updating ?

I performed an offline reboot (the PackageKit equivalent to `sudo dnf5 offline
reboot`) via Discover, so yes.

> What is your kio-extras version (certainly 25.04) ?

`rpm -qa kio-extras` returns `kio-extras-25.04.0-2.fc42.x86_64`.

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