qt 6.5.1 original

tests/manual/wasm/eventloop/dialog_exec/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+qt_internal_add_manual_test(dialog_exec
+    GUI
+    SOURCES
+        main.cpp
+    LIBRARIES
+        Qt::Core
+        Qt::Gui
+        Qt::Widgets
+)

tests/manual/wasm/eventloop/dialog_exec/main.cpp

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+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+#include <QtGui>
+#include <QtWidgets>
+
+// This example show how calling QDialog::exec() shows the dialog,
+// but does not return.
+
+class ClickWindow: public QRasterWindow
+{
+public:
+    ClickWindow() {
+        qDebug() << "ClickWindow constructor";
+    }
+
+    ~ClickWindow() {
+        qDebug() << "ClickWindow destructor";
+    }
+
+    void paintEvent(QPaintEvent *ev) override {
+        QPainter p(this);
+        p.fillRect(ev->rect(), QColorConstants::Svg::deepskyblue);
+        p.drawText(50, 100, "Application has started. See the developer tools console for debug output");
+    }
+
+    void mousePressEvent(QMouseEvent *) override {
+        qDebug() << "mousePressEvent(): calling QMessageBox::exec()";
+
+        QMessageBox messageBox;
+        messageBox.setText("Hello! This is a message box.");
+        connect(&messageBox, &QMessageBox::buttonClicked, [](QAbstractButton *button) {
+           qDebug() << "Button Clicked" << button;
+        });
+        messageBox.exec(); // <-- does not return
+
+        qDebug() << "mousePressEvent(): done"; // <---  will not be printed
+    }
+};
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    ClickWindow window;
+    window.show();
+
+    return app.exec();
+}