SwipeDelegate: animations gone missing

import QtQuick 2.5
import QtQuick.Window 2.2
import QtQuick.Controls 2.0

Window {
    id: window
    width: 360
    height: 480
    visible: true

    ListView {
        model: 10
        anchors.fill: parent
        delegate: SwipeDelegate {
            text: index
            width: parent.width

            swipe.behind: Rectangle {
                color: "tomato"
                width: parent.width
                height: parent.height
            }
        }
    }
}