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[Bug 1340078] Re: Partially onscreen surfaces are not properly occluded when the on screen part is covered by another surface

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From: Launchpad Bug Tracker <1340078@xxxxxxxxxxxxxxxxxx>
Date: Thu, 17 Jul 2014 14:25:47 -0000
Reply-to: Bug 1340078 <1340078@xxxxxxxxxxxxxxxxxx>
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** Branch linked: lp:ubuntu/utopic-proposed/mir

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https://bugs.launchpad.net/bugs/1340078

Title:
  Partially onscreen surfaces are not properly occluded when the on
  screen part is covered by another surface

Status in Mir:
  Fix Committed
Status in “mir” package in Ubuntu:
  Triaged

Bug description:
  To reproduce run mir_demo_serve_shell with two mir clients. Move one
  client surface partially off screen, place the other client surface on
  top, covering the whole on screen part of the bottom client's surface.

  Expected: the bottom client receives an occlusion event
  Actual: Nothing happens. The bottom client receives an occlusion event only when the top surface covers its surface completely, including the off screen part.

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