[grits] Update OpenGL widget positioning under OSX

[Andy Spencer <andys src gnome org>]

commit 1deeccd3a6203f50c3fa67c87b46d98a019b9e80
Author: Andy Spencer <andy753421 gmail com>
Date:   Wed Jan 2 06:03:32 2013 +0000

    Update OpenGL widget positioning under OSX

 src/gtkgl.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/gtkgl.c b/src/gtkgl.c
index 8808ed5..32957f5 100644
--- a/src/gtkgl.c
+++ b/src/gtkgl.c
@@ -288,6 +288,8 @@ void gtk_gl_begin(GtkWidget *widget)
 	GtkAllocation alloc;
 	gdk_window_ensure_native(gtk_widget_get_window(widget));
 	gtk_widget_get_allocation(widget, &alloc);
+	gtk_widget_translate_coordinates(widget, gtk_widget_get_toplevel(widget),
+		0, 0, &alloc.x, &alloc.y);
 
 	NSOpenGLContext *ctx  = g_object_get_data(G_OBJECT(widget), "glcontext");
 	GdkWindow       *win  = gtk_widget_get_window(widget);