Appearing of QMessageBox brings the minimized application to foreground

Starting with Qt5, when the message box dialog appears while the application is minimized, the application window is made the front-most one (i.e. the application is brought to foreground). With Qt4, the application window did not show up.

Steps to reproduce:

1. Run the below program
2. Minimize the application window
3. The message box will appear after a few seconds

Result: The application window will show up along with the message box

Expected result: The application window does not show up

#include <QApplication>
#include <QMessageBox>
#include <QTimer>

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

    auto window = new QWidget;

    QMessageBox msgBox(window);
    msgBox.setText("Message Box");
    QTimer::singleShot(5000, &msgBox, &QMessageBox::exec);

    window->show();

    return QApplication::exec();
}