only allow task grid expand downward
only allow task grid expand downward

webstream-io/jobsworth,digitalnatives/jobsworth,xuewenfei/jobsworth,digitalnatives/jobsworth,webstream-io/jobsworth,digitalnatives/jobsworth,xuewenfei/jobsworth,xuewenfei/jobsworth,webstream-io/jobsworth,webstream-io/jobsworth,ari/jobsworth,digitalnatives/jobsworth,xuewenfei/jobsworth,ari/jobsworth,digitalnatives/jobsworth,ari/jobsworth,ari/jobsworth