I recently came across .config/plasma-org.kde.plasma.desktop-appletsrc and was surprised at the size of it (62MB). When I looked through the file I saw that the [ScreenMapping] section had an entry for files that are long gone. Is there anyway to have the system rebuild the file and remove files that are gone?
If I remember correctly macOS before X had an option to rebuild the desktop which did something similar. Even a 3rd party tool would be handy.