[mmstick]

Needed by pop-os/cosmic-settings#2047

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[jacobgkau]

Looks from git history like this feature was initially enabled, but was dropped during #31.

I'm not seeing any difference in behavior with this update (an AVIF image is not showing up in Settings or as a slideshow when placed in a custom slideshow folder), so I assume it'll need a cosmic-settings update to pull it in, too?

I did regression testing, all settings on the Wallpapers page are still working as expected compared to before.

[mmstick]

Yes, I'll have avif support for cosmic-settings soon