Comment 10 for bug 2001708

I believe the Gnome content snap now has the webp-pixbuf-libraries in it in the snable release. As such, new installations of the Pinta snap should be able to read/write webp files.

In a few weeks (to give the content snap time to rollout), I'll release an update to the snap to add webp as a supported MIME type for the right click > open with functionality. This should then regenerate the loaders.cache of existing users, enabling webp for them too.

To test/enable this sooner, you'd need to run `sudo snap refresh`, to ensure the content snap is up to date, and then `sudo snap remove --purge pinta && sudo snap install pinta`, to regenerate the caches.

As such, the rest of this bug can probably be tackled as just a Flatpak specific problem.