[gtksourceview] Add a weak pointer to text buffer in gutter renderer.

[Krzesimir Nowak <krnowak src gnome org>]

commit 862cfffff9de001aa854c0915007909a453ae7d7
Author: Krzesimir Nowak <qdlacz gmail com>
Date:   Mon Dec 20 07:03:43 2010 +0100

    Add a weak pointer to text buffer in gutter renderer.

 gtksourceview/gtksourcegutterrenderer.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/gtksourceview/gtksourcegutterrenderer.c b/gtksourceview/gtksourcegutterrenderer.c
index 1dee8ab..31bc591 100644
--- a/gtksourceview/gtksourcegutterrenderer.c
+++ b/gtksourceview/gtksourcegutterrenderer.c
@@ -93,13 +93,18 @@ on_buffer_changed (GtkTextView             *view,
                    GParamSpec              *spec,
                    GtkSourceGutterRenderer *renderer)
 {
+	GtkTextBuffer* buffer;
+
 	if (GTK_SOURCE_GUTTER_RENDERER_GET_CLASS (renderer)->change_buffer)
 	{
 		GTK_SOURCE_GUTTER_RENDERER_GET_CLASS (renderer)->change_buffer (renderer,
 		                                                                renderer->priv->buffer);
 	}
 
-	renderer->priv->buffer = gtk_text_view_get_buffer (view);
+	buffer = gtk_text_view_get_buffer (view);
+
+	renderer->priv->buffer = buffer;
+	g_object_add_weak_pointer (G_OBJECT (buffer), (gpointer)&renderer->priv->buffer);
 }
 
 static void