Qt reports wrong Qt::Launch* key

Press a key which generates XF86Launch1.
Qt will think Qt::Key_Launch3 is pressed.

Press a key which generates XF86Launch2.
Qt will think Qt::Key_Launch4 is pressed.

Press a key which generates XF86Launch3.
Qt will think Qt::Key_Launch5 is pressed.

Press a key which generates XF86Launch4.
Qt will think Qt::Key_Launch6 is pressed.

This was tested on a Sony VAIO VGN-SR51/S laptop which has a few programmable hotkeys (you can see them in http://www.youtube.com/watch?v=2Udh_rfhfIo). The keysyms which X11 thinks they are were checked using xev.