QTest::ignoreMessage() fails to match regex against warning string

#include <QtTest>

// add necessary includes here

class Test : public QObject
{
    Q_OBJECT

public:
    Test();
    ~Test();

private slots:
    void test_case1();

};

Test::Test()
{

}

Test::~Test()
{

}

void Test::test_case1()
{
    QWindow window;
    window.resize(400, 400);

    // Start inside and drag outside (e.g. moving a selection to the edge of a
    // canvas should scroll the canvas).
    QTest::mousePress(&window, Qt::LeftButton, Qt::NoModifier, QPoint(200, 200));

    const QRegularExpression regex(".*Mouse event at .* occurs outside of target window.*");
    QVERIFY(regex.isValid());

    const QRegularExpressionMatch match(regex.match("Mouse event at 600, 600 occurs outside of target window (400x400)."));
    QVERIFY(match.hasMatch());

    QTest::ignoreMessage(QtWarningMsg, regex);
    QTest::mouseMove(&window, QPoint(600, 600));

    QTest::ignoreMessage(QtWarningMsg, regex);
    QTest::mouseRelease(&window, Qt::LeftButton, Qt::NoModifier, QPoint(600, 600));
}

QTEST_MAIN(Test)

#include "tst_test.moc"