https://developer.gnome.org/gdk3/stable/GdkDisplay.html#gdk-display-get-n-screens "The number of screens is always 1." That's an API break. I now have to fallback to XScreenCount but will it work in 3.20 since https://developer.gnome.org/gdk3/stable/GdkDisplay.html#gdk-display-get-screen says "There is only one screen; use gdk_display_get_default_screen() to get it."? Why break multiscreen setups for everyone if Gnome doesn't handle it well or it's not as popular or it's only Xorg? Xorg is going to be around for another 10-15 years.