ActiveFocus property appears to change unnecessarily

import QtQuick 1.0

Column {
    id: root
    focus: true

    onActiveFocusChanged: console.log("root activeFocus changed " + root.activeFocus)

    ListView {
        model: 10
        width: 200
        height: 200
        focus: true
        id: lv

        onActiveFocusChanged: console.log("listview activeFocus changed " + lv.activeFocus)

        delegate : Text { 
                width: parent.width; 
                text: model.modelData + " is the " + (activeFocus ? " activeFocus" : "") + (focus ? " focus" : "") + " item" ;
                font.bold: true
                color: activeFocus ? "red" : (focus ? "green" : "black")
                    }
    }

}