[okular] [Bug 453131] New: Okular cannot open JPEG-XL (.jxl) files

[Magnus Anderson]

https://bugs.kde.org/show_bug.cgi?id=453131

            Bug ID: 453131
           Summary: Okular cannot open JPEG-XL (.jxl) files
           Product: okular
           Version: 22.04.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Image backend components
          Assignee: okular-devel at kde.org
          Reporter: todamath at gmail.com
  Target Milestone: ---

SUMMARY
See title

STEPS TO REPRODUCE
1. Create or find an image/jxl file.
2. Open it using Okular

OBSERVED RESULT
Popup opens with
> Could not open file:///home/mag/Pictures/Screenshots/Screenshot_1.jxl. 
> Can not find a plugin which is able to handle the document being passed.
Printed to stdout says
> org.kde.okular.core: No plugin for mimetype '"image/jxl"'.

EXPECTED RESULT
Open the .jxl file

SOFTWARE/OS VERSIONS
Operating System: Garuda Linux
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3
Kernel Version: 5.17.4-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-1065G7 CPU @ 1.30GHz
Memory: 11.3 GiB of RAM
Graphics Processor: Mesa Intel® Iris® Plus Graphics

ADDITIONAL INFORMATION
kimageformats has a library that should be able to handle this, I think. It
works in other KDE apps. So it should hopefully be a simple fix.

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