QTableWidget update problem

Steps to reproduce / test case
Compile and run enclosed program in debug mode; this bug was not present with Qt 4.5.2.

This program periodically fills a QTableWidget with data using a QTimer. The example form will alternate between a large and standard small font size. In the large font size the first row of data will not update. Clicking on the row will cause a partial update.

I also have used QTableWidget in a different way where I empty the table on each refresh and fill it with new QTableWidgetItems. It works correctly in this manner but this causes problems with mouse click events on the table because a click during an update will sometimes be missed. The reason I need this example code to work is so that click events work correctly.