Haven't tested yet, but bug 1575765 has reminded me this probably should not be expected to work.
Without a pointer grab, Compiz will be intercepting the Alt+drag. Indeed, the click and drag should never reach the Mir server.
Haven't tested yet, but bug 1575765 has reminded me this probably should not be expected to work.
Without a pointer grab, Compiz will be intercepting the Alt+drag. Indeed, the click and drag should never reach the Mir server.