Virtual keyboard should position itself automatically so that it doesn't hide focused input fields

Steps to reproduce:

git clone git://code.qt.io/qt/qtvirtualkeyboard.git
cd qtvirtualkeyboard
git checkout 5.6 && git pull
qmake
make && sudo make install
export QT_IM_MODULE=qtvirtualkeyboard

Then run any application with QLineEdits and click on any of them. Virtual keyboard will appear. However, the virtual keyboard will always be on bottom of the screen, sometimes hiding the input field so the user cannot see what he/she types.