[mutter] wayland: Only set newly_attached if the buffer changes

[Jasper St. Pierre <jstpierre src gnome org>]

commit d0f0be8b033e02d1d3ac1eec77a1aeca09a32eec
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Apr 11 23:24:05 2014 -0700

    wayland: Only set newly_attached if the buffer changes
    
    This cleans up the check to determine if the buffer changed,
    meaning we shouldn't have to pass it around like we needed
    to do before.

 src/wayland/meta-wayland-surface.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/wayland/meta-wayland-surface.c b/src/wayland/meta-wayland-surface.c
index 25c4f32..328a18f 100644
--- a/src/wayland/meta-wayland-surface.c
+++ b/src/wayland/meta-wayland-surface.c
@@ -150,7 +150,7 @@ commit_attached_buffer (MetaWaylandSurface             *surface,
                         MetaWaylandDoubleBufferedState *pending)
 {
   /* wl_surface.attach */
-  if (pending->newly_attached && surface->buffer != pending->buffer)
+  if (pending->newly_attached)
     {
       surface_set_buffer (surface, pending->buffer);
       return TRUE;
@@ -416,6 +416,9 @@ wl_surface_attach (struct wl_client *client,
   else
     buffer = NULL;
 
+  if (surface->buffer == buffer)
+    return;
+
   if (surface->pending.buffer)
     wl_list_remove (&surface->pending.buffer_destroy_listener.link);