QTreeWidget child widgets are not moving when scrolled and stylesheets are applied on OSX

Widgets set by QTreeWidget::setItemWidget are not moving when the widget is scrolled and if stylesheets are applied.
Git bisecting the problem is in this commit: http://qt.gitorious.org/qt/qt/commit/5e5e16f/diffs?diffmode=sidebyside&fragment=1
The stylesheet sets isOpaque to 0 and then it returns in if (!accelerateScroll)

without drawing the child widgets.
THe problem can be that case when the widget is overlapped by child widgets is not handled.
Please check the attachment for example to reproduce.