[mutter] clutter/actor: Fix pick when actor is not allocated

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 902302a174483eabe796227a3fc82a36770f40b2
Author: Andre Moreira Magalhaes <andre endlessm com>
Date:   Tue Mar 31 18:11:19 2020 -0300

    clutter/actor: Fix pick when actor is not allocated
    
    When selecting the pick regions for an actor we were not considering
    whether the actor was allocated and that was causing issues where the
    preferred width/height of the actor was used when deciding whether
    the actor should be considered as a pick target.
    
    Check if the actor has a valid allocation, in addition to being mapped
    and being in pick mode, in clutter_actor_should_pick_paint().
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1169

 clutter/clutter/clutter-actor.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/clutter/clutter/clutter-actor.c b/clutter/clutter/clutter-actor.c
index 56eaad611..b82d847a4 100644
--- a/clutter/clutter/clutter-actor.c
+++ b/clutter/clutter/clutter-actor.c
@@ -2410,6 +2410,7 @@ clutter_actor_should_pick_paint (ClutterActor *self)
   g_return_val_if_fail (CLUTTER_IS_ACTOR (self), FALSE);
 
   if (CLUTTER_ACTOR_IS_MAPPED (self) &&
+      clutter_actor_has_allocation (self) &&
       (_clutter_context_get_pick_mode () == CLUTTER_PICK_ALL ||
        CLUTTER_ACTOR_IS_REACTIVE (self)))
     return TRUE;