[Bug 51124] [sna/uxa] Artifacts while dragging icons on desktop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=51124

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTOURBUG

--- Comment #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ok, I understand what is going on here now.

There has been no call to SetRootWindowBackground (which would be via a
XChangeWindowAttributes by one of the clients to set the root pixmap) and so
the root->backgroundState has been left as None due to the canDoBgNoneRoot hack
to preserve the fbcon during X startup.

As the root->backgroundState == None, when a window moves the expose event on
the root window is ignored (though miClearWindow calling miPaintWindow).

Ultimately this bug can only be prevented if gdm sets its final presentation
pixmap as the background on the root window.

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