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

[Iain Lane]

Thanks, I uploaded it to utopic-proposed.

There's another SRU (4.3) still awaiting verification, but tjaalton
tells me that it is fine. If you're an SRU team member reviewing this
upload and he hasn't fixed the tags yet, please poke him hard and then
you should be able to release that one and upload this.

** Also affects: xserver-xorg-video-intel (Ubuntu Utopic)
   Importance: Undecided
       Status: New

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

** Changed in: xserver-xorg-video-intel (Ubuntu Utopic)
       Status: New => In Progress

** Changed in: xserver-xorg-video-intel (Ubuntu Utopic)
     Assignee: (unassigned) => Marius Gedminas (mgedmin)

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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 source package in Utopic:
  In Progress

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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