[dolphin] [Bug 497576] New: Preview pixelation and scale problems in Dolphin after upgrade from Dolphin 24.08.3 -> 24.12.0

[OIRNOIR]

https://bugs.kde.org/show_bug.cgi?id=497576

            Bug ID: 497576
           Summary: Preview pixelation and scale problems in Dolphin after
                    upgrade from Dolphin 24.08.3 -> 24.12.0
    Classification: Applications
           Product: dolphin
           Version: 24.12.0
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: panels: information
          Assignee: dolphin-bugs-null at kde.org
          Reporter: hi at oirnoir.dev
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Upon updating to dolphin 24.12.0, the information panel (F11) in Dolphin now
displays previews wrongly for images. Instead of fitting the image, it fills
it, cutting off the longer side. In addition, it seems unusually pixelated,
even for high resolution images. I was able to reproduce this on a clean
install in a VM.

STEPS TO REPRODUCE
- Install Fedora 41 KDE spin
- Obtain any non-square (so, either horizontal or vertical) image in either png
or jpg format
- In Dolphin, navigate to the directory containing your image
- Enable the information portal via hamburger menu → Show Panels → Information
- Hover over the image

OBSERVED RESULT
Part of the image is now cut off, and it may look slightly pixelated.

EXPECTED RESULT
The entire image is shown within the borders of the preview, and it doesn’t
look pixelated

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Linux 6.12.4
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.8.0
Qt Version: 6.8.1

ADDITIONAL INFORMATION

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