containsMouse property not updated correctly for overlapping mouse areas during dragging

import QtQuick 2.2
import QtTest 1.0

Item {
    id: scene
    width: 300
    height: 300

    MouseArea {
        id: mouseAreaBack
        width:200; height:200; x: 50; y: 50
        hoverEnabled: true
    }

    MouseArea {
        id: mouseAreaFront
        width:100; height:100; x: 100; y: 100
    }

    TestCase {
        name: "OverlappingMouseAreas"
        when: windowShown

        function test_overlappingMouseArea(data) {
            mouseMove(scene, 25, 150);
            // move mouse over mouseAreaBack and mouseAreaFront
            mouseMove(scene, 150, 150);
            compare(mouseAreaBack.containsMouse, true); // <- PASS
            // press within mouseAreaFront and drag the mouse out of mouseAreaBack and mouseAreaFront
            mousePress(scene, 150, 150);
            mouseMove(scene, 275, 150);
            // not ok, we are outside of mouseAreaBack now
            compare(mouseAreaBack.containsMouse, false); // <- FAIL
            mouseRelease(scene, 275, 150);
            // not ok after releasing the mouse
            compare(mouseAreaBack.containsMouse, false); // <- FAIL
            // moving the mouse a bit updates containsMouse
            mouseMove(scene, 275 + 1, 150);
            compare(mouseAreaBack.containsMouse, false); // <- PASS
        }
    }
}