Comment 2 for bug 727041

StacktraceTop:
 window_closed (screen=<value optimized out>, win=0x194a500) at /build/buildd/compiz-0.9.4/unity/unity_window_decorator/src/wnck.c:725
 g_closure_invoke (closure=0x188e330, return_value=0x0, n_param_values=2, param_values=0x195e590, invocation_hint=0x7fffc7fa7e20) at /build/buildd/glib2.0-2.28.1/./gobject/gclosure.c:767
 signal_emit_unlocked_R (node=<value optimized out>, detail=0, instance=0x188f030, emission_return=0x0, instance_and_params=0x195e590) at /build/buildd/glib2.0-2.28.1/./gobject/gsignal.c:3252
 g_signal_emit_valist (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>, var_args=<value optimized out>) at /build/buildd/glib2.0-2.28.1/./gobject/gsignal.c:2983
 g_signal_emit (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>) at /build/buildd/glib2.0-2.28.1/./gobject/gsignal.c:3040