[Qt-interest] custom OpenGL widget update blocks other Qt GUIrendering

[Tony Rietwyk]

Artem indirectly said: 

> > I simply added to the end of the function that is called by 
> the timer and
> > invokes "updateGL" method the following line: qApp->processEvents();
> >
> > void PreviewWindow::OnTimerEvent()
> > {
> >   ... some other stuff
> >
> >   updateGL();
> >
> >   // Prevents GUI thread from stalling when frame rate is low.
> >   qApp->processEvents();
> > }

This doesn't make sense!  When the timer event exits, isn't it going to
process events anyway?  There must be something else preventing events from
being processed.  

Tony