I’m looking to develop a companion app for a game as a plasmoid.
I’d expect plasma to resolve icons and notifyrc files from inside the plasmoid folder which seemingly isn’t a thing.
Other plasmoids achieve this by executing a shell script on a first run and copy those files to ~/.local/share/knotifications6/ and somewhere into ~/.local/share/icons/.
This approach seems very dirty to me as it also does not clean up when the plasmoid gets uninstalled.
That does seem bad. Might be worth formally supporting this. I’d recommend submitting a feature request for it at https://bugs.kde.org.