[gtk+] wayland: Implement the get_next_serial vfunc on GdkDisplay

[Rob Bradford <rbradford src gnome org>]

commit e13cca00ccd84a6810832f2dca0c20c2eed9c3df
Author: Rob Bradford <rob linux intel com>
Date:   Fri Jan 6 16:47:53 2012 +0000

    wayland: Implement the get_next_serial vfunc on GdkDisplay

 gdk/wayland/gdkdisplay-wayland.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gdk/wayland/gdkdisplay-wayland.c b/gdk/wayland/gdkdisplay-wayland.c
index a6442d7..2e9e98a 100644
--- a/gdk/wayland/gdkdisplay-wayland.c
+++ b/gdk/wayland/gdkdisplay-wayland.c
@@ -425,7 +425,8 @@ gdk_wayland_display_after_process_all_updates (GdkDisplay *display)
 static gulong
 gdk_wayland_display_get_next_serial (GdkDisplay *display)
 {
-  return 0;
+  static gulong serial = 0;
+  return ++serial;
 }
 
 void