Please describe the problem:
libwnck fullscreen state is sometimes wrong. It reports e.g. totem as fullscreen
when totem returned from fullscreen already. This seems to be cause by the fact
that un-fullscreen events are not deteced. 

Steps to reproduce:
1. change test-wnck.c so that it reports fullscreen state changes as well to the
terminal (see attached patch)
2. run test-wnck
3. start totem
4. switch with totem to fullscreen mode
5. switch back to normal mode



Actual results:
test-wnck reports:
---------------------8<------------------
Active window changed
Stacking changed
Stacking changed
Geometry changed on window 'Totem Movie Player': 0,0  1280 x 1024
State changed on window 'Totem Movie Player'
 fullscreen = 1
Geometry changed on window 'Totem Movie Player': 674,537  598 x 441
Geometry changed on window 'Bottom Edge Panel': 928,999  185 x 25
Geometry changed on window 'Top Expanded Edge Panel': 0,0  1280 x 26
---------------------8<------------------

Expected results:
It should report a state change for the fullscreen state two times, once when it
enters fullscreen and once when it leaves fullscreen.

Does this happen every time?
yes

Other information:
Patch to show fullscreen states in libwnck:

--- test-wnck.c.orig    2005-09-19 15:18:01.000000000 +0200
+++ test-wnck.c 2005-09-19 15:18:51.000000000 +0200
@@ -274,6 +274,9 @@
   if (changed & WNCK_WINDOW_STATE_STICKY)
     g_print (" sticky = %d\n", wnck_window_is_sticky (window));

+  if (changed & WNCK_WINDOW_STATE_FULLSCREEN)
+    g_print (" fullscreen = %d\n", wnck_window_is_fullscreen (window));
+
   g_assert ( ((new & WNCK_WINDOW_STATE_MINIMIZED) != 0) ==
              wnck_window_is_minimized (window) );
   g_assert ( ((new & WNCK_WINDOW_STATE_MAXIMIZED_HORIZONTALLY) != 0) ==