add zul test file for ZK-2285
Bug ZK-2379: selectbox with model error when calling parent invalidate()
Merge branch '6.5' of github.com:zkoss/zk into 6.5
Merge remote-tracking branch 'upstream/6.5'
refix B65-ZK-2379 for ZK Bind issue
Merge remote-tracking branch 'upstream/6.5'
Fine tune for B65-ZK-2379
Merge remote-tracking branch 'upstream/6.5'