Selection highlight overlaps with next character when aligning center horizontally

If text is aligned center horizontally, the selection highlight can overlap with the next character. It seems to be a rounding issue as increasing the layout width by 1 pixel fixes the overlap. Increase width by another pixel again and there is overlap. It cycles every 2 pixels. This doesn't occur when aligning left or right.

This can be seen in several places:
-QTextEdit - run the Rich Text example, higlight "Text" in "QTextEdit" title and resize the window width
-QTextLayout - see attached example
-QML Text item with a span having different background for the selected text (Qt Quick 1.1) - see https://bugreports.qt-project.org/browse/QTBUG-34218
-QML TextEdit - see https://bugreports.qt-project.org/browse/QTBUG-34220