[PATCH xserver] glamor: Disable logic ops when doing compositing

[Eric Anholt]

Keith Packard <keithp at keithp.com> writes:

> If the logic op gets left enabled, it overrides the blending
> operation, causing incorrect contents on the display.
>
> Signed-off-by: Keith Packard <keithp at keithp.com>

Reviewed-by: Eric Anholt <eric at anholt.net>
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