https://bugs.kde.org/show_bug.cgi?id=500664

            Bug ID: 500664
           Summary: Gwenview does not use mime type subclasses when
                    checking for supported image formats.
    Classification: Applications
           Product: gwenview
           Version: 24.12.2
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 178799
  --> https://bugs.kde.org/attachment.cgi?id=178799&action=edit
A mime type package file containing the definitions for
application/x-pico-8+png, which subclasses from image/png

SUMMARY

Gwenview does not use mime type subclasses when checking for supported image
formats.

STEPS TO REPRODUCE
1. Define a mime type that subclasses from image/png
2. Create a file with the defined mime type
3. Attempt to open the file using gwenview

OBSERVED RESULT

A message appears with "Gwenview cannot display documents of type <mime>"

EXPECTED RESULT

Gwenview opens and shows the file using the format of the mime type's parent
classes.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Fedora 41
KDE Plasma Version: 6.3.1
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION

I have attached a mime type package file used to test this issue, which can be
used with any file using the extension ".p8.png"

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