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

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

--- Comment #8 from Roke Julian Lockhart Beedell <[email protected]> ---
Created attachment 182747
  --> https://bugs.kde.org/attachment.cgi?id=182747&action=edit
A Screenshot Of Details Mode At 16 px In 25.04.2-1.fc42

This also applies to new thumbnails. For future reference, I'm utilising
https://koji.fedoraproject.org/koji/rpminfo?rpmID=42997615. If, like me, you
can't see it, watch
https://discussion.fedoraproject.org/t/why-cant-i-access-koji-builds/156646.
Though, it's:

> ~~~
> Name            : dolphin
> Epoch           : 0
> Version         : 25.04.2
> Release         : 1.fc42
> Architecture    : x86_64
> Installed size  : 12.7 MiB
> Source          : dolphin-25.04.2-1.fc42.src.rpm
> From repository : <unknown>
> URL             : https://invent.kde.org/system/dolphin
> Vendor          : Fedora Project
> ~~~

Considering that this is graphical (ignore
https://bugs.kde.org/show_bug.cgi?id=505439), undermentioned is relevant
environment information:

> ~~~
> Operating System: Fedora Linux 42
> KDE Plasma Version: 6.4.0
> KDE Frameworks Version: 6.15.0
> Qt Version: 6.9.1
> Kernel Version: 6.14.11-300.fc42.x86_64 (64-bit)
> Graphics Platform: Wayland
> Graphics Processor 1: AMD Radeon RX 5700
> Graphics Processor 2: AMD Radeon Graphics
> ~~~

I neglected to originally include this.

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