Ensure the itemTransform in QInputPanel is always up to date

Ensure the itemTransform in QInputPanel is always up to date

Hook into the render loop and update the itemTransform in
the QInputPanel before we repaint.

Change-Id: If9122ba0fbe31cff3bfcc3edc48f684cc9b16984
Reviewed-on: http://codereview.qt-project.org/4405
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Vesa Rantanen <vesa.rantanen@nokia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>