When releasing the scrollbar handle while the mouse pointer is over the scrollbar track, the mouseUp event propagates to both the track and the handle and the event handler for the track takes over. Track clicking event handler should only fire when state.dragging is set to false.
When releasing the scrollbar handle while the mouse pointer is over the scrollbar track, the mouseUp event propagates to both the track and the handle and the event handler for the track takes over. Track clicking event handler should only fire when state.dragging is set to false.