Similar to https://bugs.kde.org/show_bug.cgi?id=61514 there could be a new item in the Actions context menu for image files: "Set as wallpaper" or "Set as desktop background image" which sets the selected image as wallpaper.
Available from the KDE Store: https://store.kde.org/p/1169583/ Dolphin: Configure Dolphin > Services > Download New Services...
Thanks for the hint. A service menu like this should be integrated in Dolphin by default. This particular one has a restriction: "Widgets need to be unlocked, otherwise it won't work." (it fails silently).
+1 for making this available by default.
This seems like a no brainer. Ive been looking all over for 'set as desktop background' option. It should be included by default.
This is such a basic function, dolphin really need this by default.
The importance of this ticket is set to "wishlist". I therefore remove the prefix "[Request]" from the summary.
https://store.kde.org/p/1169583/
*** This bug has been marked as a duplicate of bug 358038 ***