[gtk+] broadway: Use SOURCE operator when scrolling

[Alexander Larsson <alexl src gnome org>]

commit dfbabfbd6dc80d7e9f14339d8938de90b3ede82c
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Dec 19 22:27:08 2012 +0100

    broadway: Use SOURCE operator when scrolling

 gdk/broadway/gdkbroadway-server.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gdk/broadway/gdkbroadway-server.c b/gdk/broadway/gdkbroadway-server.c
index 139ac8e..597a34e 100644
--- a/gdk/broadway/gdkbroadway-server.c
+++ b/gdk/broadway/gdkbroadway-server.c
@@ -1338,6 +1338,7 @@ copy_region (cairo_surface_t *surface,
   cairo_t *cr;
 
   cr = cairo_create (surface);
+  cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
 
   _cairo_region (cr, area);
   cairo_clip (cr);