Neil Roberts f1baa4d60f Clear the scissor before calling glBlitFramebuffer in swap_region
glBlitFramebuffer is affected by the scissor so we need to ensure
there is an empty clip flushed before using it. This is similar to
what is done in _cogl_blit_framebuffer().

https://bugzilla.gnome.org/show_bug.cgi?id=690451

Reviewed-by: Robert Bragg <robert@linux.intel.com>
Tested-by: Aaron Plattner <aplattner@nvidia.com>

(cherry picked from commit 65da3f88af9c7b8d72758d116c2652aff68195c1)
2013-01-07 16:37:29 +00:00
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