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

Status in Canonical System Image:
  Triaged
Status in Mir:
  New
Status in mir package in Ubuntu:
  Confirmed
Status in qtmir package in Ubuntu:
  Triaged
Status in unity-system-compositor package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Invalid

Bug description:
  frieza build 101/rc-proposed

  Steps:
  1. connect mouse & keyboard to M10
  2. launch xchat
  3. go full screen
  4. mouse move around across the entirety of the screen (landscape)

  expected: mouse can range over entire screen
  actual: gets stuck moving right

  note: i noticed it happening on xchat, but when changing focus to dash
  it was also continuing to happen

  So, i kinda suspect this may be related to rotation maybe.
  I do admit i did the full OOBE in portrait mode

  Problem is also persisting across reboot.

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