Screen previews are not updated by "Set random wallpapers"
When selecting wallpapers, they're first shown on a list of preview icons, with one icon per display.
When using "Set random wallpapers", I'd expect these previews to be updated as well. This is especially relevant because I use a tiling window manager, so most of the time my windows are all in fullscreen, and I rely on the previews to know which wallpapers I'm setting. Having these fails to change is a minor confusion.