ListView result is incorrect after inserting before visible and moving a following index

import QtQuick 2.0

Item {
    width: 600; height: 600

    ListView {

        id: view2
        width: 240; height: 320
        x: 100
        y: 100

        model: ListModel {
            id: model2
            Component.onCompleted: {
                for (var i=0; i<30; i++) {
                    append({'name': 'item ' + i})
                }
            }
        }
        delegate: Rectangle {
            border.width: 1

            width: 200; height: 20;
            Row {
                Text { text: name + " : " + index + " : " }
                Text { text: " " + parent.parent.x + ", " + parent.parent.y }
            }
            objectName: name
        }

        focus: true

        Keys.onEnterPressed: {
            contentY = 80
        }

        Keys.onReturnPressed: {
            model.insert(0, {"name": "new item" })
        }

        Keys.onSpacePressed: {
            model.move(1, 6, 3)
        }

    }

    Rectangle {
        anchors.fill: view2
        color: "lightsteelblue"
        opacity: 0.3

    }
    Text { anchors.right: parent.right; text: "content y:" + view2.contentY + ", count: " + model2.count }// + " " + view2.count }

}