[clutter/clutter-1.18] stage-cogl: Fix buffer_age code path

[Adel Gadllah <agadllah src gnome org>]

commit 263939553385102bf53fe3dfeaa64ee7364d7b89
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Sun Feb 16 22:07:43 2014 +0100

    stage-cogl: Fix buffer_age code path
    
    Currently we where checking whether the damage_history list contains
    more or equal then buffer_age entries. This is wrong because we prepend
    our current clip to the list just before the check.
    
    Fix that to check whether we have more entries instead of more or equal.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=724788

 clutter/cogl/clutter-stage-cogl.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/clutter/cogl/clutter-stage-cogl.c b/clutter/cogl/clutter-stage-cogl.c
index c84dafb..ab34200 100644
--- a/clutter/cogl/clutter-stage-cogl.c
+++ b/clutter/cogl/clutter-stage-cogl.c
@@ -483,11 +483,12 @@ clutter_stage_cogl_redraw (ClutterStageWindow *stage_window)
 
         stage_cogl->damage_history = g_slist_prepend (stage_cogl->damage_history, current_damage);
 
-        if (age != 0 && !stage_cogl->dirty_backbuffer && g_slist_length (stage_cogl->damage_history) >= age)
+        if (age != 0 && !stage_cogl->dirty_backbuffer && g_slist_length (stage_cogl->damage_history) > age)
           {
             int i = 0;
             GSList *tmp = NULL;
-            for (tmp = stage_cogl->damage_history; tmp; tmp = tmp->next)
+            /* We skip the first entry because it is the clip_region itself */
+            for (tmp = stage_cogl->damage_history->next; tmp; tmp = tmp->next)
               {
                 _clutter_util_rectangle_union (clip_region, tmp->data, clip_region);
                 i++;