SUMMARY Currently they are sorted randomly / not sorted, and it would make sense to sort them. The only issue I can see, is they need to be translated first and only then sorted otherwise they would appear unsorted.
Should be easy to do using a sortFilterModel. Let me know if you'd like to learn how to do that!
Sure I would. Where should I begin? What repo does this belong to? Do I need a special environment? I am guessing it won't be easily to build on Arch.
In this case it's pretty darn simple. You just re-arrange these items to be alphabetically ordered: https://invent.kde.org/plasma/kdeplasma-addons/-/blob/master/wallpapers/potd/contents/ui/config.qml#L82 Perhaps "All" should remain on top, though. Since this is a QML file, you don't even need to set up a development environment; you can test the changes locally on your own system. The file should be located at /usr/share/plasma/wallpapers/org.kde.potd/contents/ui/config.qml. Let me know if you get stuck and need a helping hand!
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kdeplasma-addons/-/merge_requests/78
Git commit 44c85476fad0eb559d7319feedc4b5daff26aa8c by Nate Graham, on behalf of Arnaud Vergnet. Committed on 22/07/2021 at 18:17. Pushed by ngraham into branch 'master'. Sort Unsplash POTD image categories alphabetically M +40 -40 wallpapers/potd/contents/ui/config.qml https://invent.kde.org/plasma/kdeplasma-addons/commit/44c85476fad0eb559d7319feedc4b5daff26aa8c
Git commit ed7c2c218ee3cae72115f7e66ee57ee2878bdda8 by Nate Graham, on behalf of Arnaud Vergnet. Committed on 22/07/2021 at 18:19. Pushed by ngraham into branch 'Plasma/5.22'. Sort Unsplash POTD image categories alphabetically (cherry picked from commit 44c85476fad0eb559d7319feedc4b5daff26aa8c) M +40 -40 wallpapers/potd/contents/ui/config.qml https://invent.kde.org/plasma/kdeplasma-addons/commit/ed7c2c218ee3cae72115f7e66ee57ee2878bdda8