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[Launchpad Bug Tracker <1378326@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/vivid-proposed/mir

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https://bugs.launchpad.net/bugs/1378326

Title:
  [krillin] overlays are not displayed onscreen in some positions

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

Bug description:
  Some positioning of overlays causes the driver to accept the layer as
  an overlay, and then not display it onscreen. This only affects the
  "'stable device'", and seems to be a driver problem.

  How to reproduce:
  1) Position a 500x500 window at 0,0
  2) Position a 400x400 window at 0,0

  The appearance of the smaller window will cause the first to
  disappear, when on other devices, both are displayed with the smaller
  window on top of the larger window. The driver accepts one of the
  layers as an overlay, and then fails to display it.

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