QScrollArea tab focus problem

Platform
Windows XP
Platform details
XP SP3
Compilers
MSVC
Compiler details
2008 SP 1

Steps to reproduce / test case
QScrollArea does not scroll to child widget that is outside viewport, when tab focus moves from a sibling of QScrollArea to a child of QScrollArea. (tab focus between child widgets scrolls ok).

A widget with many focusable child widgets is set as content for a QScrollArea, vertical layout. Large enough, that many of the child widgets are outside viewport. When moving focus with tab, initially everything goes ok. When the focus loops back to the topmost child widget (which has scrolled outside viewport), the QScrollArea does not scroll the widget visible. Only after moving focus to the next child widget, the scroll area scrolls to the focused widget. Same happens also when going backwards with Shift + tab.
More information