Opening a virtual keyboard on top of QML editors has a slight drawing flicker compared to the native apps

Run attached qml example with qmlviewer on Symbian^3 device. Click on the shown text input field. Virtual keyboard opens up with a slight flicker. Now open the virtual keyboard on native Symbian Messaging or Notes applications, the animation is smooth. Tested on top of QtQuick 1.1 branch sha e46c44f9538dbe5b44ce61d3a42403cfa471ae8b.