Bug fixed B65-ZK-1793: Grid with hidden header flickering back and forth
when you scroll horizontally
http://tracker.zkoss.org/browse/ZK-1793

Bug refixed B65-ZK-1284: Grid/Listbox header and content horizontal
synchronization in IE browser.
http://tracker.zkoss.org/browse/ZK-1284
correct test file B65-ZK-1793.zul
Merge branch 'B65-ZK-1793' of git://github.com/RaymondChao/zk