clutter/actor: Queue redraw on no-layout parents when unmapping

As explained in https://gitlab.gnome.org/GNOME/mutter/-/issues/1494,
with commit 29caa5bea576ed056aa6c82de192426abe6019ae we stopped queueing
a relayout for the parent of the removed actor in
clutter_actor_remove_child_internal(). This relayout was, as opposed to
the relayout in clutter_actor_real_hide()/clutter_actor_real_unmap(),
queued unconditionally without looking at the parents NO_LAYOUT flag.

Now while that relayout in clutter_actor_remove_child_internal() would
do unnecessary work if the parent had the NO_LAYOUT flag set, it did
also queue a redraw of the parent, which is necessary in any case.

So by removing that relayout in clutter_actor_remove_child_internal(),
we stopped queueing redraws for NO_LAYOUT parents when a child gets
removed from the scenegraph. This caused bugs where the texture of the
child would be left visible on the screen even though the child got
destroyed.

To fix this, make sure again that we always queue a redraw on the parent
when unmapping a child.

Fixes https://gitlab.gnome.org/GNOME/mutter/-/issues/1494

1 files changed, 7 insertions, 3 deletions

diff --git a/clutter/clutter/clutter-actor.c b/clutter/clutter/clutter-actor.c
index e1ff406b0..66a096851 100644
--- a/clutter/clutter/clutter-actor.c
+++ b/clutter/clutter/clutter-actor.c
@@ -1648,9 +1648,13 @@ clutter_actor_real_unmap (ClutterActor *self)
      _clutter_paint_volume_init_static (&priv->last_paint_volume, NULL);
       priv->last_paint_volume_valid = TRUE;
 
-      if (priv->parent && !CLUTTER_ACTOR_IN_DESTRUCTION (priv->parent) &&
-          (!(priv->parent->flags & CLUTTER_ACTOR_NO_LAYOUT)))
-        clutter_actor_queue_relayout (priv->parent);
+      if (priv->parent && !CLUTTER_ACTOR_IN_DESTRUCTION (priv->parent))
+        {
+          if (G_UNLIKELY (priv->parent->flags & CLUTTER_ACTOR_NO_LAYOUT))
+            clutter_actor_queue_redraw (priv->parent);
+          else
+            clutter_actor_queue_relayout (priv->parent);
+        }
     }
 
   /* notify on parent mapped after potentially unmapping