[gtk/wip/chergert/muxer-robustness-fix] muxer: force muxer dispoal as part of widget dispose

[Christian Hergert <chergert src gnome org>]

commit b5b836668a03b8ba56c46ed17585b5beb51749f1
Author: Christian Hergert <chergert redhat com>
Date:   Wed Mar 25 14:02:59 2020 -0700

    muxer: force muxer dispoal as part of widget dispose
    
    We need to cleanup state here immediately so that we do not potentially
    access the g_class private data after it been finalized. This ensures that
    the borrowed reference is dropped by the muxer.

 gtk/gtkactionmuxer.c | 2 ++
 gtk/gtkwidget.c      | 5 +++++
 2 files changed, 7 insertions(+)
---
diff --git a/gtk/gtkactionmuxer.c b/gtk/gtkactionmuxer.c
index 303d26e738..26ca311efc 100644
--- a/gtk/gtkactionmuxer.c
+++ b/gtk/gtkactionmuxer.c
@@ -858,6 +858,8 @@ gtk_action_muxer_dispose (GObject *object)
 
   g_hash_table_remove_all (muxer->observed_actions);
 
+  muxer->widget = NULL;
+
   G_OBJECT_CLASS (gtk_action_muxer_parent_class)
     ->dispose (object);
 }
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 6d25c73357..48ead879f0 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -7357,6 +7357,11 @@ gtk_widget_dispose (GObject *object)
   GtkWidget *widget = GTK_WIDGET (object);
   GtkWidgetPrivate *priv = gtk_widget_get_instance_private (widget);
   GSList *sizegroups;
+  GtkActionMuxer *muxer;
+
+  muxer = g_object_get_qdata (G_OBJECT (widget), quark_action_muxer);
+  if (muxer != NULL)
+    g_object_run_dispose (G_OBJECT (muxer));
 
   if (priv->children_observer)
     gtk_list_list_model_clear (priv->children_observer);