[Bug 1378188] Re: [GNOME3 Staging PPA] strange shadow rendered where client-side decorations are used

[Marius Gedminas]

I built a patched 2:2.99.914-1~exp1ubuntu4.2mg1 (debdiff applied fine,
except for the debian/changelog bits) and uploaded it to my ppa
(ppa:mgedmin/ppa).  I'm currently running it: shadows are fine.

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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:
  Triaged

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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