[REG 5.5 -> 5.6] QQuickWidget suppresses QtQuick Controls tooltips

import QtQuick 2.3
import QtQuick.Controls 1.2

Rectangle {
    visible: true
    width: 640
    height: 480

    Action {
        id: action
        tooltip: "lalala"
    }

    Button {
        text: qsTr("Hello World")
        anchors.centerIn: parent
        action: action
    }
}

#include <QApplication>
#include <QQuickWidget>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QQuickWidget widget;
    widget.setSource(QUrl::fromEncoded("qrc:/main.qml"));
    widget.show();
    return app.exec();
}