title: QLineEdit: how to handle up and down arrows?
body: <p>I have a console input in my <code>Qt</code> based application, it's a <code>QLineEdit</code>, all Ui is designed via <code>QtDesigner</code>. Is it any easy way way to handle up and down arrows in order to implement input history? The 'go to slot' only show <code>returnProcessed</code> signal, no way i can see to handle up and down arrows :(</p>