When you have a SimpleListModel with a lot of data and scroll to rod, it teleport back to the selected item and keep scrolling down.

You can see the bug here : http://zkfiddle.org/sample/3kvld74/156-Listbox-bug-Zk-8-0-1-1

• Run it and scroll to around the middle by moving the scrollbar "button".
• Select 1 item in the middle.
• Scroll slowly with mousewheel up and stop when you are near end of data/start of rod
• You will notice that the scroll scrollback to where you selected the item and start to move the item at the bottom of the list.

Here is a little gif showing the bug :
https://i.gyazo.com/64dcc40a80f355535e40d896801e3418.gif