[dolphin] [Bug 443735] New: Thumbnails for .cbz files does not support .webp, .avif etc

[Magnus Boman]

https://bugs.kde.org/show_bug.cgi?id=443735

            Bug ID: 443735
           Summary: Thumbnails for .cbz files does not support .webp,
                    .avif etc
           Product: dolphin
           Version: 21.08.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: magunasu.b97 at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 142442
  --> https://bugs.kde.org/attachment.cgi?id=142442&action=edit
No thumbnail being generated for .cbz

SUMMARY
When you have a .cbz (and possibly other formats like .epub) with a .webp,
.avif and possibly other "exotic" file formats as the only picture, no
thumbnail is being made. If a "common" format is also in the archive, it will
be shown as thumbnail instead, but in many instances that might be several
pages later which renders it useless and misleading. I have qt5-imageformats
installed and pictures of those formats do get thumbnails in Dolphin.


STEPS TO REPRODUCE
1. Create a .cbz (a renamed .zip) containing a .webp or .avif image
2. Observe the file in Dolphin
3. Notice its lack of thumbnail

OBSERVED RESULT
No thumbnail or wrong thumbnail being shown, see attachment

EXPECTED RESULT
The first page of the comic being shown as thumbnail

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.23.0
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
Kernel Version: 5.14.12-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: Radeon RX Vega

ADDITIONAL INFORMATION

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