Steps to reproduce:
1. Create a application which keeps on trigger expose event at a high rate(eg, 1000 expose event/second)
2. Run the application in any version of gtk+ environment for more than an hour
3. The application will crash with segv.


Stack trace:

+ Trace 151486

1046                }
1047              else
1048                {
1049                  queue_delete_link (display_x11->translate_queue,
1050                                     display_x11->translate_queue->head);
1051                  queue_item_free (item);
1052                }
1053            }
1054        }
1055
(gdb) p *(GdkWindowQueueItem *)tmp_list->data
$31 = {window = 0x9bbcc28, serial = 341, type = GDK_WINDOW_QUEUE_ANTIEXPOSE, u = {translate = {
      dx = 163135504, dy = 46399540}, antiexpose = {area = 0x9b94010}}}
(gdb) p *(GdkWindowQueueItem *)tmp_list->prev->data <= overflow
$32 = {window = 0x9a35d88, serial = 57, type = GDK_WINDOW_QUEUE_ANTIEXPOSE, u = {translate = {
      dx = 161749920, dy = 16}, antiexpose = {area = 0x9a41ba0}}}
(gdb) p *(GdkWindowQueueItem *)tmp_list->prev->prev->data      <=here, serial value is near the max ulong
$33 = {window = 0x9a36010, serial = 4294967176, type = GDK_WINDOW_QUEUE_ANTIEXPOSE, u = {translate = {
      dx = 161771960, dy = 52}, antiexpose = {area = 0x9a471b8}}}
(gdb) p *(GdkWindowQueueItem *)tmp_list->prev->prev->prev->data
$34 = {window = 0x9a36010, serial = 4294966893, type = GDK_WINDOW_QUEUE_ANTIEXPOSE, u = {translate = {
      dx = 161807208, dy = 16}, antiexpose = {area = 0x9a4fb68}}}

Other information:
The application will always crash after the internal gdk variable GdkWindowQueueItem::serial exceeds its max value, which will cause the application to remove some very old already-handled window in _gdk_window_process_expose function(gdk/x11/gdkgeometry-x11.c), and then segv happened, application crashed.