[gtk+/native-layout] Remove existing signal connections in gtk_drag_dest_unset().

[Tristan Van Berkom <tvb src gnome org>]

commit 1ae55844f786c05e649ff193c4f0f415874149eb
Author: Cody Russell <bratsche gnome org>
Date:   Fri Jan 29 11:09:13 2010 -0600

    Remove existing signal connections in gtk_drag_dest_unset().
    
    Fixes https://bugzilla.gnome.org/show_bug.cgi?id=608370

 gtk/gtkdnd.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkdnd.c b/gtk/gtkdnd.c
index bdd3ab9..1ebc284 100644
--- a/gtk/gtkdnd.c
+++ b/gtk/gtkdnd.c
@@ -1341,8 +1341,22 @@ gtk_drag_dest_set_proxy (GtkWidget      *widget,
 void 
 gtk_drag_dest_unset (GtkWidget *widget)
 {
+  GtkDragDestSite *old_site;
+
   g_return_if_fail (GTK_IS_WIDGET (widget));
 
+  old_site = g_object_get_data (G_OBJECT (widget),
+                                "gtk-drag-dest");
+  if (old_site)
+    {
+      g_signal_handlers_disconnect_by_func (widget,
+                                            gtk_drag_dest_realized,
+                                            old_site);
+      g_signal_handlers_disconnect_by_func (widget,
+                                            gtk_drag_dest_hierarchy_changed,
+                                            old_site);
+    }
+
   g_object_set_data (G_OBJECT (widget), I_("gtk-drag-dest"), NULL);
 }