QtQuickTest: a test case with "when: windowShown" issues a warning on Windows in subsequent test cases

When running a test case after a test case that has the when-property set to windowShown, you get the following warning on Windows unless the width of the component under test is greater than 115px:

QWARN : qmltestrunner::UnknownTestFunc() QWindowsWindow::setGeometry: Unable to set geometry <width < 116>x<some height>+66+110 on QQuickView/<some_test_file>. Resulting geometry: 116x<some height>+66+110 (frame: 8, 30, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).

See the following example:

// tst_data.qml
import QtTest 1.0

TestCase {
    name: "data"

    function test_data_only() {
        compare(1, 1);
    }
}

// tst_rectangle.qml
import QtQuick 2.2
import QtTest 1.0

Item {
    Rectangle {
        id: rect
        color: "#ff0000"
    }

    TestCase {
        name: "rectangle"

        function test_rect_color() {
            compare(rect.color, "#ff0000");
        }
    }
}

// tst_window_shown.qml
import QtQuick 2.2
import QtTest 1.0

Item {
    width: 5
    height: 5

    MouseArea {
        id: mouseArea
        property string message: "not clicked"
        anchors.fill: parent
        onClicked: {
            mouseArea.message = "clicked"
        }
    }

    TestCase {
        name: "window_shown"
        when: windowShown

        function test_mouse_interaction() {
            compare(mouseArea.message, "not clicked");
            mouseClick(mouseArea, mouseArea.width / 2, mouseArea.height / 2);
            compare(mouseArea.message, "clicked");
        }
    }

}

Now, run them in different combinations and different order:

1) data -> rectangle -> window_shown: no warning
2) rectangle -> data: no warning
3) window_shown -> data: warning!
4) window_shown -> rectangle: warning!
5) window_shown -> window_shown: warning!

So, any test case that is not within an Item wider than 115px and run after tst_window_shown.qml leads to the warning. This seems to be because the window is reused and tried to be resized.

Especially the combination 3) from above is confusing because the second test is pure data, i.e. without relation to any visual component.

Please see attached zip to reproduce this conveniently.