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[Launchpad Bug Tracker <1378188@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xserver-xorg-video-intel -
2:2.99.914-1~exp1ubuntu4.4

---------------
xserver-xorg-video-intel (2:2.99.914-1~exp1ubuntu4.4) utopic; urgency=medium

  * fix-sna-trapezoids.patch: Fix client-side shadows for GTK+ 3.14
    (LP: #1378188).

 -- Marius Gedminas <marius@xxxxxxxxx>  Tue, 05 May 2015 11:25:15 +0100

** Changed in: xserver-xorg-video-intel (Ubuntu Utopic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1378188

Title:
  [GNOME3 Staging PPA] strange shadow rendered where client-side
  decorations are used

Status in xserver-xorg-video-intel package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-intel-lts-utopic package in Ubuntu:
  Invalid
Status in xserver-xorg-video-intel-lts-utopic source package in Trusty:
  New
Status in xserver-xorg-video-intel source package in Utopic:
  Fix Released

Bug description:
  [Impact]
  The Intel video driver has a bug that can cause to incorrectly draw certain trapezoids. This is visible when using client side decorations in GNOME 3 (see attached screenshots).

  [Test Case]
  Run GNOME 3 with client side decorations on Intel hardware.
  Observed result:
  Shadow under window is missing corners.
  Expected result:
  Shadow looks correct.

  [Regression potential]
  Low. The fix is from upstream and just changes the logic error in the CompositeTrapezoids routine.

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