[gtk+] GtkStack: Don't emit notify::visible-child during destruction

[Debarshi Ray <debarshir src gnome org>]

commit 39e7afecb1ee882232e887e1b3e4c30ae0afe3a3
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed May 6 15:19:55 2015 +0200

    GtkStack: Don't emit notify::visible-child during destruction
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749012

 gtk/gtkstack.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkstack.c b/gtk/gtkstack.c
index 652b856..302c65e 100644
--- a/gtk/gtkstack.c
+++ b/gtk/gtkstack.c
@@ -206,6 +206,17 @@ gtk_stack_init (GtkStack *stack)
 }
 
 static void
+gtk_stack_dispose (GObject *obj)
+{
+  GtkStack *stack = GTK_STACK (obj);
+  GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
+
+  priv->visible_child = NULL;
+
+  G_OBJECT_CLASS (gtk_stack_parent_class)->dispose (obj);
+}
+
+static void
 gtk_stack_finalize (GObject *obj)
 {
   GtkStack *stack = GTK_STACK (obj);
@@ -375,6 +386,7 @@ gtk_stack_class_init (GtkStackClass *klass)
 
   object_class->get_property = gtk_stack_get_property;
   object_class->set_property = gtk_stack_set_property;
+  object_class->dispose = gtk_stack_dispose;
   object_class->finalize = gtk_stack_finalize;
 
   widget_class->size_allocate = gtk_stack_size_allocate;