[cogl] pipeline: Initialize unknown_color_alpha on copy

[Robert Bragg <rbragg src gnome org>]

commit e6a6a2752fb1cc14860cbc559f41f25f7e7f195e
Author: Damien Lespiau <damien lespiau intel com>
Date:   Fri Jul 12 08:48:53 2013 +0100

    pipeline: Initialize unknown_color_alpha on copy
    
    Just like:
    
    commit f3adec1faeb651dd97095a02256932cc82761f40
    Author: Neil Roberts <neil linux intel com>
    Date:   Thu Jul 11 13:51:28 2013 +0100
    
        Initialise dirty_real_blend_enable in _cogl_pipeline_copy
    
    But this time for unknown_color_alpha.
    
    Reviewed-by: Robert Bragg <robert linux intel com>

 cogl/cogl-pipeline.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/cogl/cogl-pipeline.c b/cogl/cogl-pipeline.c
index 7fc41e4..d576e53 100644
--- a/cogl/cogl-pipeline.c
+++ b/cogl/cogl-pipeline.c
@@ -341,6 +341,7 @@ _cogl_pipeline_copy (CoglPipeline *src, CoglBool is_weak)
    * every pipeline node so we have fast access to it. */
   pipeline->real_blend_enable = src->real_blend_enable;
   pipeline->dirty_real_blend_enable = src->dirty_real_blend_enable;
+  pipeline->unknown_color_alpha = src->unknown_color_alpha;
 
   /* XXX:
    * consider generalizing the idea of "cached" properties. These