After a flick ListViews are not coming to rest on an exact pixel

import QtQuick 2.0

Rectangle {
    width: 800
    height: 400

    Rectangle {
        id: rect
        x: 500
        y: 80
        width: 20
        height: 20
        color: "pink"
    }

    ListView {
        width: 400
        height: 400
        model: 100
        delegate: Rectangle {
            id: innerRect
            width: 400
            height: 50
            color: index % 2 ? "grey" : "darkgrey"
            Rectangle {
                width: 400
                height: 1
                color: "black"
                y: 25
            }

            MouseArea {
                id: mouse
                anchors.fill: parent
                onClicked: print(innerRect.mapToItem(rect).y)
            }
        }
    }

}