WebView doesn't handle non-persistent SG and GL

#include <QtQuick>
#include <QtGui>
#include <QtCore>

int main(int argc, char **argv)
{
    QGuiApplication app(argc, argv);

    QQuickView view;
    view.setGeometry(100, 100, 400, 400);
    view.setSource(QUrl::fromLocalFile("main.qml"));
    view.setResizeMode(QQuickView::SizeRootObjectToView);
    view.setPersistentOpenGLContext(false);
    view.setPersistentSceneGraph(false);
    view.rootContext()->setContextProperty("window", &view);
    view.show();

    app.exec();
}

import QtQuick 2.0
import QtWebKit 3.0
import QtQuick.Window 2.0

Item {

    width: 640
    height: 480

    WebView {
        id: webview
        url: "http://reddit.com"
        anchors.fill: parent
        onNavigationRequested: {
            // detect URL scheme prefix, most likely an external link
            var schemaRE = /^\w+:/;
            if (schemaRE.test(request.url)) {
                request.action = WebView.AcceptRequest;
            } else {
                request.action = WebView.IgnoreRequest;
                // delegate request.url here
            }
        }
    }

    visible: true

    Rectangle {
        width: parent.width
        height: 100
        anchors.bottom: parent.bottom;
        color: Qt.rgba(1, 0, 1, 0.5);
        MouseArea {
            anchors.fill: parent
            onClicked: {
                window.visible = false;
                timer.running = true;
            }
        }
    }

    Timer {
        id: timer;
        running: false
        repeat: false
        interval: 2000
        onTriggered: {
            window.visible = true;
        }
    }
}