QQuickWidget: Minimizing the Application Window bumps GPU usage

The issue is observed when QQuickWidget is running a Qt3D Qml and using openGL. After minimizing the application window, the render function in Qt3D and glFlush function is being called at very short interval (~7ms), which bumps the GPU usage higher than when the window is exposed. It looks like we do not need the QQuickWidgetPrivate::renderSceneGraph ( which is triggered by the timer set in QuickWidget::triggerUpdate )  to be called when the window is NOT exposed.