[macOS] [Regression] QMenu not drawn properly when shown on regular display after shown on Retina display

#include <QApplication>
#include <QDialog>
#include <QMenu>
#include <QAction>
#include <QToolButton>

class TestDialog : public QDialog {
	Q_OBJECT

public:
	TestDialog(QWidget* parent=nullptr) :
	QDialog(parent),
	  theButton(new QToolButton(this)),
	  theMenu(new QMenu(this))
	{
		theButton->setText("Values");
		theMenu->addAction("a");
		theMenu->addAction("b");
		theMenu->addAction("c");

		// Make connection.
		connect(theButton, &QAbstractButton::clicked, this, [=]() {
			// Make sure that the button is drawn as being pressed (down).
			theButton->setDown(true);

			theMenu->exec(theButton->mapToGlobal(theButton->rect().bottomRight()));

			// Make sure that the button is drawn as being released (up).
			theButton->setDown(false);
		});
	}

private:
	QToolButton* theButton;
	QMenu* theMenu;
};


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

	TestDialog td;
	td.show();

	return a.exec();
}


#include "main.moc"