Patch: fix regression introduced in intel driver version 2.16.0

[Chris Clayton]

Hi,

I recently upgraded from version 2.15.0 of the intel driver to 2.17.0 but found that with the latter 
a trail of 'droppings' was left in the otherwise blank areas of a konqueror window when an icon was 
dragged around in the window, under kde-3.5.10. The 'droppings' can be cleaned up by refreshing the 
window. Investigation showed that the fault is also present in 2.16.0. I cloned the git archive and 
through bisection identified the change that introduced the problem as:

commit ace324e4aa27effdd621156eec03f3f87b610732
Author: Eric Anholt <eric at anholt.net>
Date:   Tue May 31 23:13:18 2011 -0700

    uxa: Simplify BLT solid acceleration for spans filling by only clipping once.

Due to subsequent changes that patch cannot be reverted but the attached patch reverts the 2.17.0 
driver to its old (2.15.0) behaviour  and eliminates the 'droppings'.

Happy to test a better patch that anyone cooks up.

Chris

-- 
The more I see, the more I know. The more I know, the less I understand. Changing Man - Paul Weller
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