Confirmed this is a libinput regression - I've built and installed libinput 1.8.4 from Artful and that returned the RMB click functionality (though of course many other things that rely on libinput >= 1.9 broke).
Confirmed this is a libinput regression - I've built and installed libinput 1.8.4 from Artful and that returned the RMB click functionality (though of course many other things that rely on libinput >= 1.9 broke).