[PATCH weston] compositor: Fix xwayland surface alpha.

[Tiago Vignatti]

On 09/02/2012 06:58 AM, Scott Moreau wrote:
> Re-add the opaque_rect hack back to shaders so xwayland surfaces are not broken. xwm
> is the only one that uses weston_surface::opaque_rect, specifically for this reason.
> It was removed by 0e5a2d02191 - "compositor: simplify shaders", which simplified them
> a bit too much.

Reviewed-by: Tiago Vignatti <tiago.vignatti at intel.com>