#include <QtWidgets>
class ScopedCursor {
public:
    explicit ScopedCursor(QWidget* widget,
                          Qt::CursorShape cursorShape = Qt::WaitCursor,
                          bool processEvents = false)
        : m_widget(widget), m_processEvents(processEvents)
    {
        if (m_widget) {
            m_savedShape = m_widget->cursor().shape();
            if (m_savedShape != cursorShape) {
                m_widget->setCursor(cursorShape);
                if (m_processEvents) QApplication::processEvents();
            }
        }
    }
    ~ScopedCursor() { restore(); }

    void restore() {
        if (m_widget && m_widget->cursor().shape() != m_savedShape) {
            m_widget->setCursor(m_savedShape);
            if (m_processEvents) QApplication::processEvents();
        }
    }

private:
    QWidget* m_widget = nullptr;
    Qt::CursorShape m_savedShape = Qt::ArrowCursor;
    bool m_processEvents = false;
};

static void reproduce(QWidget* w) {
    const ScopedCursor cursor(w, Qt::WaitCursor, true);
    QThread::msleep(5000);
    QMessageBox::critical(w, "1",
                          "wait cursor is correctly not shown while dialog is shown");
    QThread::msleep(5000);
}

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    QWidget w;
    w.setWindowTitle("Support Ticket 00753818");
    w.resize(360, 120);
    w.show();
    QTimer::singleShot(100, [&w]{ reproduce(&w); });

    return app.exec();
}