[mutter/wip/carlosg/input-thread: 21/96] clutter: Work out stage from actor on which to emit crossing

[Robert Mader <rmader src gnome org>]

commit 6de3661692c42eb7c4ad3c83de662849d23f418c
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Jun 5 15:48:57 2020 +0200

    clutter: Work out stage from actor on which to emit crossing
    
    Don't rely on the device stage.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1403

 clutter/clutter/clutter-input-device.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)
---
diff --git a/clutter/clutter/clutter-input-device.c b/clutter/clutter/clutter-input-device.c
index 5f6ad11888..98b4246998 100644
--- a/clutter/clutter/clutter-input-device.c
+++ b/clutter/clutter/clutter-input-device.c
@@ -785,10 +785,22 @@ _clutter_input_device_set_actor (ClutterInputDevice   *device,
                                  gboolean              emit_crossing)
 {
   ClutterActor *old_actor = clutter_input_device_get_actor (device, sequence);
+  ClutterStage *stage = NULL;
 
   if (old_actor == actor)
     return;
 
+  if (emit_crossing)
+    {
+      if (actor)
+        stage = CLUTTER_STAGE (clutter_actor_get_stage (actor));
+      else if (old_actor)
+        stage = CLUTTER_STAGE (clutter_actor_get_stage (old_actor));
+
+      if (!stage)
+        return;
+    }
+
   if (old_actor != NULL)
     {
       ClutterActor *tmp_old_actor;
@@ -800,7 +812,7 @@ _clutter_input_device_set_actor (ClutterInputDevice   *device,
           event = clutter_event_new (CLUTTER_LEAVE);
           event->crossing.time = device->current_time;
           event->crossing.flags = 0;
-          event->crossing.stage = device->stage;
+          event->crossing.stage = stage;
           event->crossing.source = old_actor;
           event->crossing.x = device->current_x;
           event->crossing.y = device->current_y;
@@ -837,7 +849,7 @@ _clutter_input_device_set_actor (ClutterInputDevice   *device,
           event = clutter_event_new (CLUTTER_ENTER);
           event->crossing.time = device->current_time;
           event->crossing.flags = 0;
-          event->crossing.stage = device->stage;
+          event->crossing.stage = stage;
           event->crossing.x = device->current_x;
           event->crossing.y = device->current_y;
           event->crossing.source = actor;