Wrong focus handling in QDateEdit when setSpecialValueText is u sed

Platform: WindowsXP

Modified a QDateEdit to use setSpecialValueText as an "empty" Date, e.g. *..***

and arranged the QDateEdit in a layout where a QLineEdit is before and after the QDateEdit in the focus chain (see attached UI file)

Expected to see:

when date is "empty", means specialValueText is displayed, i can tab through the widgets as usual. however, this only works if a "correct" date is displayed in QDateEdit.

Got instead:

in case of displaying a special value text, the tab remains in the QDateEdit and the next widget can not be focussed.

More details:

Problem can be reproduced very easily. Just open the attached file in designer, preview the form and tab through the widgets. as long as there is a valid date, tabbing through the widgets with "TAB-Key" works as expected. As soon as there is a specialValueText in QLineEdit ("Empty"), tabbing stops in QLineEdit.