Looking at Mir's SurfaceInputDispatcher::deliver_pointer,
auto target = find_target_surface(event_x_y);
printf("input event target %p, pos: (%d,%d)\n", target.get(),
event_x_y.x.as_int(), event_x_y.y.as_int());
prints this when hitting the barrier:
input event target 0x562470, pos: (1177,323)
input event target (nil), pos: (1213,323)
that is with mouse only about 300 pixels across the screen.
But I guess the real problem is that the Mir cursor coordinate is
outside the physical display space, i.e. it should go beyond x=1200, and
thus always be over the unity8 surface. Unity8 reads the cursor movement
delta, not the position, to position its cursor
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https://bugs.launchpad.net/bugs/1580774
Title:
mouse is getting stuck on a phantom edge
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