re-fix for ZK-2280
Bug ZK-2296: After selecting an item, combobox's dropdown will scroll to right automatically
Merge remote-tracking branch 'upstream/6.5'
Bug ZK-2294: Combobox popup scroll back to top when navigating by keyboard
Merge remote-tracking branch 'upstream/6.5'
Bug ZK-2295: Move tree item causes selection status lost
Merge remote-tracking branch 'upstream/6.5'