Visible jittering when two list view delegates are animating at the same time

import Qt 4.7

Item {
    width: 360
    height: 600

    ListView {
        id: listView
        anchors.fill: parent
        model: testModel
        delegate: listItemDelegate
        focus: true
    }

    ListModel {
        id: testModel
        ListElement { }
        ListElement { }
        ListElement { }
    }

    Component {
        id: listItemDelegate

        Rectangle {
            id: listItem
            width: listView.width
            height: 100

            states: State {
                name: "expanded"
                PropertyChanges { target: listItem; height: 150 }
            }

            transitions: [ Transition { NumberAnimation { target: listItem; properties: "height"; duration: 1000 } } ]

            gradient: Gradient {
                GradientStop { position: 0.0; color: "#cccccc";  }
                GradientStop { position: 1.0; color: "#000000";  }
            }

            state: listItem.ListView.isCurrentItem ? "expanded" : "";
        }
    }


}