I've been looking how to span a single wallpaper across all monitors / desktops but there's just no option. The only thing would be to split the image and set them separately. The problem is when you want to change or use the slideshow function to automatically change wallpapers.
Does anyone know if there's some hidden option to do this or have only 1 desktop panel for all monitors?
Based on what I read, this was possible back in KDE 3.5... I can't believe they just dropped this option... Let alone, boast of multi monitor support in newer versions when you can't do basic stuff like this...