wallpaper command only sets wallpaper for current desktop

[goodevilgenius]

If you have an external monitor, multiple desktops, or both, the wallpaper command will not change the wallpaper for all of them, but just the primary monitor on the current desktop

[bensleveritt]

Ah, thanks for raising this. We'll likely have to iterate over all the desktops, setting each one, which painfully means knowing more about Applescript. I'll give it a go, but it might take a while

[K-Mazur]

I created a pull request with an update for changing all desktops wallpapers instead of just a primary monitor #181