[mutter] meta-surface-actor: Fix is_argb32 for unredirected windows

[Adel Gadllah <agadllah src gnome org>]

commit 3a8bad1e6f0622127e2377ac6d849f9b554b6f88
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Tue Aug 26 18:22:33 2014 +0200

    meta-surface-actor: Fix is_argb32 for unredirected windows
    
    meta_surface_actor_is_argb32 assumes that lack of stex means that a window is
    ARGB32. When we unredirect a window we detach the texture so we end up without
    a texture. Given that should_unredirect returns FALSE when a window is argb32,
    we know that this window is indeed not ARGB32.
    
    Returing TRUE in that case causes us to flip between redirected and
    unredirected on every paint.
    
    So fix that by returning FALSE in that case.

 src/compositor/meta-surface-actor.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/src/compositor/meta-surface-actor.c b/src/compositor/meta-surface-actor.c
index e7e3a02..bb85478 100644
--- a/src/compositor/meta-surface-actor.c
+++ b/src/compositor/meta-surface-actor.c
@@ -280,9 +280,15 @@ meta_surface_actor_is_argb32 (MetaSurfaceActor *self)
   CoglTexture *texture = meta_shaped_texture_get_texture (stex);
 
   /* If we don't have a texture, like during initialization, assume
-   * that we're ARGB32. */
+   * that we're ARGB32.
+   *
+   * If we are unredirected and we have no texture assume that we are
+   * not ARGB32 otherwise we wouldn't be unredirected in the first
+   * place. This prevents us from continually redirecting and
+   * unredirecting on every paint.
+   */
   if (!texture)
-    return TRUE;
+    return !meta_surface_actor_is_unredirected (self);
 
   switch (cogl_texture_get_components (texture))
     {