[gtksourceview] Make sure to chain up dispose handler in UndoManagerDefault

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 57c3757e446b57e2b3a3c981771d3b1d825e510b
Author: Jesse van den Kieboom <jesse vandenkieboom epfl ch>
Date:   Mon Mar 22 10:35:29 2010 +0100

    Make sure to chain up dispose handler in UndoManagerDefault

 gtksourceview/gtksourceundomanagerdefault.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/gtksourceundomanagerdefault.c b/gtksourceview/gtksourceundomanagerdefault.c
index 4961d22..7564d66 100644
--- a/gtksourceview/gtksourceundomanagerdefault.c
+++ b/gtksourceview/gtksourceundomanagerdefault.c
@@ -338,6 +338,8 @@ gtk_source_undo_manager_default_dispose (GObject *object)
 		/* Clear the buffer */
 		set_buffer (manager, NULL);
 	}
+
+	G_OBJECT_CLASS (gtk_source_undo_manager_default_parent_class)->dispose (object);
 }
 
 static void