SUMMARY
Gwenview does not support the .HEIC image format.


STEPS TO REPRODUCE
1. Have a .heic image file.
2. Try to open in Gwenview
3. Get error message.


OBSERVED RESULT
- Unable to open/view image.
- Get error message:
"Loading 'image-name.heic' failed. Gwenview cannot display dicuments of this type image/heif."


EXPECTED RESULT
- Be able to open and view image.


SOFTWARE/OS VERSIONS
Operating System: Kubuntu 20.04
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
Kernel Version: 5.7.2-050702-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-6600K CPU @ 3.50GHz
Memory: 31,3 GiB of RAM


ADDITIONAL INFORMATION
They also don't display thumbnails in Dolhpin.

I've tried installing the HEIF packages for Ubuntu 20.04, but this did not affect Gwenview's ability to display the image files
§ sudo apt install heif-gdk-pixbuf

I see there are similar bugs/reports opened for digiKam, but thought I'd make one for Gwenview too.
If this is already in the works, just close this.