[gtk+/gtk-3-14] gdk_window_end_paint: Flush destination surface after paint

[Alexander Larsson <alexl src gnome org>]

commit a32967731122f50636eb88d62c4948a76a586bdb
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Nov 10 15:24:14 2014 +0100

    gdk_window_end_paint: Flush destination surface after paint
    
    It seems in cairo 1.14 we need this after having painted an image surface
    to a X11 window surface (i.e. with GDK_RENDERING=image).
    
    (cherry picked from commit 90555e06beb929c4491a58b6136aa9f0f8ae1fae)

 gdk/gdkwindow.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index ae29609..b6ac2d9 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -2864,6 +2864,8 @@ gdk_window_end_paint (GdkWindow *window)
 
       cairo_destroy (cr);
       cairo_region_destroy (full_clip);
+
+      cairo_surface_flush (surface);
     }
 
   gdk_window_free_current_paint (window);