[mutter/gnome-3-32] window-actor: Use vfunc to set the surface actor

[Marco Trevisan <marcotrevi src gnome org>]

commit 0d570f2dd39d9c388415fd2d83dc465efdd068ba
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Fri Jun 28 09:14:13 2019 +0000

    window-actor: Use vfunc to set the surface actor
    
    As per commit 80e3c1d set_surface_actor has been added, meant to do different
    things depending on the backend, like connecting to signals under X11.
    
    However, the vfunc isn't ever used, making the X11 surfaces not to react to
    repaint-scheduled signal.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/660
    
    
    (cherry picked from commit 4061c8384b72401aa47dd22c34d0fd392abe8a80)

 src/compositor/meta-window-actor.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index f850cb222..c263e3140 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -417,7 +417,7 @@ meta_window_actor_update_surface (MetaWindowActor *self)
   else
     surface_actor = NULL;
 
-  set_surface (self, surface_actor);
+  META_WINDOW_ACTOR_GET_CLASS (self)->set_surface_actor (self, surface_actor);
 }
 
 static void
@@ -476,7 +476,7 @@ meta_window_actor_dispose (GObject *object)
 
   g_clear_object (&priv->window);
 
-  set_surface (self, NULL);
+  META_WINDOW_ACTOR_GET_CLASS (self)->set_surface_actor (self, NULL);
 
   G_OBJECT_CLASS (meta_window_actor_parent_class)->dispose (object);
 }