[gtk+] Clear list of attached windows when disposing a widget

[Matthias Clasen <matthiasc src gnome org>]

commit 117c86d08a6ba73c389bd68efe4c25ef5dea6cde
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 2 08:02:40 2013 -0400

    Clear list of attached windows when disposing a widget
    
    We were silently relying on everybody to detach their windows,
    and would leak memory otherwise.

 gtk/gtkwidget.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index b3f54c6..2136928 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -11052,6 +11052,9 @@ gtk_widget_dispose (GObject *object)
 
   g_clear_object (&priv->muxer);
 
+  g_list_free (priv->attached_windows);
+  priv->attached_windows = NULL;
+
   G_OBJECT_CLASS (gtk_widget_parent_class)->dispose (object);
 }