Regression: QFileDialog::getOpenFileNames() freezes for longer time

#include <QApplication>
#include <QDebug>
#include <QElapsedTimer>
#include <QFileDialog>
#include <QTemporaryDir>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QMetaObject::invokeMethod(qApp, [] {
        QElapsedTimer timer;
        timer.start();
        QTemporaryDir dir;
        QDir tempPath(dir.path());
        const QString dirPath = tempPath.absolutePath();
        const int count = 1000;
        int generatedCount = 0;
        for (int i = 0; i < count; ++i) {
            QFile file(tempPath.filePath(QString("file_%1").arg(i)));
            if (file.open(QIODevice::WriteOnly)) {
                file.write("bla");
                file.close();
                ++generatedCount;
            }
        }
        const int elapsedTime = timer.elapsed();
        qDebug() << "Generated" << generatedCount << "out of desired" << count
                 << "files inside temporary dir" << dirPath << "took" << elapsedTime << "ms.";
        QFileDialog::getOpenFileNames(nullptr, "Get Files", dirPath);
        QMetaObject::invokeMethod(qApp, &QCoreApplication::quit, Qt::QueuedConnection);
    }, Qt::QueuedConnection);
    return a.exec();
}