[gtk+] Reserve space for a pointer in GtkDrawingArea

[Matthias Clasen <matthiasc src gnome org>]

commit 96d1c2c46e47b9ecb2704e07786912115691263d
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Dec 23 13:01:21 2010 -0500

    Reserve space for a pointer in GtkDrawingArea
    
    It was pointed out that this will let us add a private pointer
    without abi break in the future, should we ever need one.

 gtk/gtkdrawingarea.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkdrawingarea.h b/gtk/gtkdrawingarea.h
index 553b9be..c40bc93 100644
--- a/gtk/gtkdrawingarea.h
+++ b/gtk/gtkdrawingarea.h
@@ -51,6 +51,9 @@ typedef struct _GtkDrawingAreaClass  GtkDrawingAreaClass;
 struct _GtkDrawingArea
 {
   GtkWidget widget;
+
+  /*< private >*/
+  gpointer dummy;
 };
 
 struct _GtkDrawingAreaClass