Delegate of ListView/PathView is displayed in states preview of Designer

Steps to reproduce:

• have a kit configured using Qt5
• create Qt Quick 2 UI from template
• open the qml file and switch to 'Designer'
• set background for the Rectangle item to something else than white
• pull a ListView and/or PathView item into the preview

Current result:

• delegate of the view(s) is displayed in the top left corner of the states preview

Expected result:

• delegate is not visible inside the states preview

import QtQuick 2.2

ListView {
    id: listView
    objectName: "listViewObjectName"
    delegate: Item {
        id: delegateItem
        objectName: "delegateItemObjectName"
        Rectangle {
            color: "red"
            height: 100
            width: 100
        }
    }
}