onActiveFocusChanged handler gets called on a destroyed Item when quitting the application

.pragma library

function createChildObject( aContainer )
{
    var component = Qt.createComponent( "MyItem.qml" )
    return component.createObject( aContainer, {} )
}

import QtQuick 2.0
import "test.js" as Test

Rectangle
{
    id: container
    width: 360
    height: 360

    // Quit the application on mouse-click.
    MouseArea{ anchors.fill: parent; onClicked: Qt.quit(); }

    // Flag to choose whether to use JS library function,
    // or the local JS function. Both functions look identical.
    property bool useJSLib: true

    // Instantiate the child according to the chosen option.
    Component.onCompleted:
    {
        if( useJSLib )
        {
            Test.createChildObject( container )
        }
        else
        {
            createChildObject( container )
        }
    }

    function createChildObject( aContainer )
    {
        var component = Qt.createComponent( "MyItem.qml" )
        return component.createObject( aContainer, {} )
    }
}

import QtQuick 2.0

Item
{
    focus: true

    onActiveFocusChanged:
    {
        console.log( "MyItem: onActiveFocusChanged" )
        console.log( "MyItem: Active focus:" + activeFocus )
    }

    Component.onDestruction:
    {
         console.log( "MyItem: Component.onDestruction" )
    }
}