[gtk+] gtk_widget_on_frame_clock_update: ref the widget

[Owen Taylor <otaylor src gnome org>]

commit 3e81854351920076ede73a76c71431825c35d6c0
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Mon Feb 18 14:55:03 2013 -0500

    gtk_widget_on_frame_clock_update: ref the widget
    
    Handle a widget being destroyed while in a tick callback by
    referencing the widget while dispatching tick callbacks.

 gtk/gtkwidget.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 8a7fb18..bafee84 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -4577,6 +4577,8 @@ gtk_widget_on_frame_clock_update (GdkFrameClock *frame_clock,
   GtkWidgetPrivate *priv = widget->priv;
   GList *l;
 
+  g_object_ref (widget);
+
   for (l = priv->tick_callbacks; l;)
     {
       GtkTickCallbackInfo *info = l->data;
@@ -4597,6 +4599,8 @@ gtk_widget_on_frame_clock_update (GdkFrameClock *frame_clock,
       unref_tick_callback_info (widget, info, l);
       l = next;
     }
+
+  g_object_unref (widget);
 }
 
 static guint tick_callback_id;