feat: allow adding apps to the favourites

[secretmango]

I love your launcher!

But this thing is missing and not accessible from other areas.

[enzious]

I believe it worked in 5.x? Maybe there's an issue with something new?

[ruvaldak]

Yup, can't add anything to favourites anymore D:

[Cherkah]

i confirm that thismust-have feature is missing/not working.

[Damglador]

Having to add and remove vanilla launcher every time I want to add or remove something from favorites is annoying

[Damglador]

Folks, I've fixed it.

In ~/.local/share/plasma/plasmoids/org.kde.plasma.simplekickoff/contents/ui/AbstractKickoffItemDelegate.qml
Replace model.actionList with Array.from(model.actionList) and restart plasma-shell or session or PC. I didn't test it for very long, but it works, the button is there, and it does the thing