QListView: Scrolling with scrollbar causes items to hover even with the mouse not over the items

This is a minor bug. Steps to reproduce:

• Have an itemview with many and wide items, so that both scrollbars appear
• Scroll to the left, so that the items selections boxes extent beyond the vertical scrollbar
• Move the vertical scrollbar up and down using the slider
  Effect:
• While moving the slider, items "under" the slider are rendered in hovered state, which looks odd.

This is probably a regression from a recent commit for QTBUG-6024, cannot remember I have seen this before.

Tested with 4.6 branch at commit 4c3539dfbc65d5decdd842d4181f9aa3d38d213c