in gail_key_snooper in gailutil.c, the listeners which are notified may
return an int to indicate whether the listener wishes to consume the key of
not; gail_key_snooper does not check this value, but simple returns "0". 
This means that all of the key events pass through regardless, so key
listeners cannot consume keys.

The fix is to change gail_key_snooper so that it checks 
the returns from the AtkKeySnoopFuncs it calls.