[mutter] MetaWindow: fix detecting the response to an extended _NET_WM_SYNC_REQUEST

[Owen Taylor <otaylor src gnome org>]

commit aeb589c17618a5d0d673adf6ee58701b9ebc5885
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Thu Feb 14 13:02:01 2013 -0500

    MetaWindow: fix detecting the response to an extended _NET_WM_SYNC_REQUEST
    
    During resizing, An odd counter value (indicating the beginning of a frame)
    shouldn't cause us to redraw and start a new frame, only an even counter
    value. This was causing the frozen state for the window frame counter to
    overlap the frozen state for the resize, causing the window not to be
    updated.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=693833

 src/core/window.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/core/window.c b/src/core/window.c
index eb135ac..ea50d69 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -9523,7 +9523,8 @@ meta_window_update_sync_request_counter (MetaWindow *window,
 
   if (window == window->display->grab_window &&
       meta_grab_op_is_resizing (window->display->grab_op) &&
-      new_counter_value >= window->display->grab_sync_counter_wait_serial)
+      new_counter_value >= window->display->grab_sync_counter_wait_serial &&
+      (!window->extended_sync_request_counter || new_counter_value % 2 == 0))
     {
       meta_topic (META_DEBUG_RESIZING,
                   "Alarm event received last motion x = %d y = %d\n",