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

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

            Bug ID: 503075
           Summary: Thumbnails for text/plain files become posterised ≤ 22
                    px
    Classification: Applications
           Product: dolphin
           Version: 25.04.0
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: view-engine: general
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
  Target Milestone: ---

Created attachment 180451
  --> https://bugs.kde.org/attachment.cgi?id=180451&action=edit
A Screenshot of Details Mode at 16 px

SUMMARY

With thumbnails enabled for text/plain, at the size of ≤ 22 px (confirmed at
16, 22, and 32), the thumbnails are posterised. This occurs in any view mode,
for solely the size matters.

STEPS TO REPRODUCE

1. Enable previews for text/plain files.
2. Create such a file.
3. Set the icon size to ≤ 22 px.

OBSERVED RESULT

The thumbnails are posterised.

EXPECTED RESULT

They shouldn't be.

SOFTWARE/OS VERSIONS

> Operating System: Fedora Linux 42
> KDE Plasma Version: 6.3.4
> KDE Frameworks Version: 6.13.0
> Qt Version: 6.9.0
> Kernel Version: 6.14.2-300.fc42.x86_64 (64-bit)
> Graphics Platform: Wayland

Dolphin is dolphin-25.04.0-3.fc42.x86_64.

ADDITIONAL INFORMATION

This occurs in any view mode.

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