Exclude slideshow screensaver from random option during locker
This is a potential self inflicted security risc imho. (First time) Users unaware of the slideshow screensaver might just select random to have any screensaver. On Screen blanking, potentially private or otherwise security sensitive screenshots or images might be shown in a supposed safe locker/lock-screen environment without users intention.
This just happened to humble me. Trying xfce4 for some time and selecting random screensaver option, leaving all other options in xfce4-screensaver unchanged. I went afk to come back to my wife being irritated by the laptop showing random screenshots, blown up icons, mixed with holiday pics. I think it could have hit other users harder, erhm.