Mac OS: QDockWidgets containing OpenGL Widget can not be moved/detached

#include <QtWidgets>
#include <QtOpenGL>
#include <QMainWindow>
#include <QApplication>
 
class MainWindow : public QMainWindow
{
public:
    MainWindow();
};
 
MainWindow::MainWindow()
{
        setAnimated(false);
        QTextEdit * textEdit = new QTextEdit;
        textEdit->setText(QString("The OpenGL containing Dock Widget is broken on OS X with Qt 5"));
        setCentralWidget(textEdit);
        setWindowTitle(tr("Dock Widgets"));
        // Create Dock Widget
        QDockWidget *dock = new QDockWidget(tr("GL Dock"), this);
        QGLWidget * w = new QGLWidget(dock);
        dock->setWidget(w);
    addDockWidget(Qt::RightDockWidgetArea, dock);
}
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow mainWin;
    mainWin.show();
    return app.exec();
}