QComboBox auto scrolling

Steps to reproduce:

• qtbug45998.zip , Windows, populate a combo box with a list whose first item is QString::null or QString() (not reproduceable with QString("") and around 30 other items
• Open popup
• Scroll down to approx item #15
• Note small white bottom area in the list view appearing(sth wrong with item height calculation)
• Hover over that area
• Note view may occasionally scroll down

Full description availbale here (reported by me)
http://stackoverflow.com/questions/30112478/undesired-auto-scrolling-of-qcomboboxes?noredirect=1#comment48336657_30112478