only register dnd xwindow with compositor canvas in x11 compositor mode
only register dnd xwindow with compositor canvas in x11 compositor mode

registering it under wayland creates spurious mouse events

FlorentRevest/Enlightenment,rvandegrift/e,rvandegrift/e,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,rvandegrift/e,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,FlorentRevest/Enlightenment,tasn/enlightenment,tizenorg/platform.upstream.enlightenment