Context menu events not working in QOpenGLWindow

Question

I am subclassing QOpenGLWindow (not QGLWidget or QOpenGLWidget) and calling

auto container = QWidget::createWindowContainer(my_opengl_window);

to place it in the layout of a parent QWidget.

The window displays correctly and I can interact with it, but container (and its parent widget) do not receive context menu events when I right-click within my_opengl_window. I do get a context menu if I right-click on the slim margin between the window and its container.

void MyGLWindow::mousePressEvent (QMouseEvent * e)
{
    qDebug (__PRETTY_FUNCTION__);

    QOpenGLWindow::mousePressEvent (e);
}

The above shows me that my_opengl_window is receiving mouse clicks. I have also tried e->ignore () but still the parent does not receive a context menu event.

Also, setCursor and setToolTip on the container widget have no effect. I suspect this may be related.

How can I get these mouse events to work on a QOpenGLWindow container?