KCM: wallpaper: Add option to set the same wallpaper for all screens at once
Now that there is a centralized KCM for setting the wallpaper this seemed practical to do, so I gave it a go here. It just enumerates all screens using the same code as the screenIdFromName method and sets the wallpaper for each of them. I don't have additional displays, so I'm just using the virtual screen created by the screen sharing portal for testing.
KCM with the switch enabled:
KCM with the switch disabled:
Any suggestions/comments/nitpicks/etc appreciated, like where the checkbox should go, how the wallpaper setting code should be deduplicated between the per-screen and all-screens case and so on.
Edited by Prajna Sariputra