[gtk+] gdkcairo: Add a missing flush

[Jasper St. Pierre <jstpierre src gnome org>]

commit 0acad8436693faed46d2357d707ff01f103cb57a
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Sep 2 08:29:47 2014 -0700

    gdkcairo: Add a missing flush
    
    Noticed by ickle on IRC. We need to flush here to make sure that the
    image data we fetch is up to date.

 gdk/gdkcairo.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkcairo.c b/gdk/gdkcairo.c
index 066f5c4..c541215 100644
--- a/gdk/gdkcairo.c
+++ b/gdk/gdkcairo.c
@@ -477,6 +477,9 @@ gdk_cairo_region_create_from_surface (cairo_surface_t *surface)
   else
     image = cairo_surface_reference (surface);
 
+  /* Flush the surface to make sure that the rendering is up to date. */
+  cairo_surface_flush (image);
+
   data = cairo_image_surface_get_data (image);
   stride = cairo_image_surface_get_stride (image);