[dolphin] [Bug 482312] New: Dolphin SVG thumbnail generation regressed

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https://bugs.kde.org/show_bug.cgi?id=482312

            Bug ID: 482312
           Summary: Dolphin SVG thumbnail generation regressed
    Classification: Applications
           Product: dolphin
           Version: 24.02.0
          Platform: openSUSE
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: andre.cbarros at yahoo.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Dolphin svg thumbnail generation regressed due to Qt 6.6.2 changes.

STEPS TO REPRODUCE
1. If you have a folder with svg files and see generated previews with previous
Dolphin version, copy the folder to some other place and watch the much worse
svg thumbnails generated.

OBSERVED RESULT
Much worse svg thumbnails generated.

EXPECTED RESULT
Previews compatible with what previous Dolphin used to generate.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 24.02.0
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 5.115.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
I'm not expecting a precise thumbnail generation for complex svg files, this is
outside of what Qt6 can provide, but some recent changes in Qt 6.6.2 broke the
Dolphin generation of thumbnails.

Possible relevant changes: https://bugreports.qt.io/browse/QTBUG-120205

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