Setting Loader to inactive doesn't reset its width/height

import QtQuick 2.0
import QtQuick.Controls 1.1

Rectangle {
    id: rect
    width: 800
    height: 600

    property Component testRect: Rectangle {
        width: 200
        height: 200
        color: "#f90"
    }

    Column {
        Loader {
            id: testLoader
            sourceComponent: rect.testRect
            active: false
        }

        Button {
            text: testLoader.active ? "Disable" : "Enable"
            onClicked: testLoader.active = !testLoader.active
        }
    }
}

height: item ? item.height : 0