wayland-surface: Set actor size on buffer attach

When a new buffer is attached and we update the width and height
properties for the surface we now also call clutter_actor_set_size()

Reviewed-by: Neil Roberts <neil@linux.intel.com>
Reviewed-by: Emmanuele Bassi <ebassi@linux.intel.com>

clutter/wayland/clutter-wayland-surface.c

@@ -211,6 +211,8 @@ set_size (ClutterWaylandSurface *self,
       priv->height = height;
       g_object_notify (G_OBJECT (self), "height");
     }
+
+  clutter_actor_set_size (CLUTTER_ACTOR (self), priv->width, priv->height);
 }
 
 struct wl_surface *