[vtkusers] GtkGLExtVTKRenderWindowInteractor update

[Jed Haile]

Everybody,

As an update to the render problems I have been having with 
GtkGLExtVTKRenderWindowInteractor, where objects appear the be rendered 
inside out, I have a small update.

I changed the line in OnRealize from:
self._RenderWindow.SetWindowInfo(win_id)
to
self._RenderWindow.SetParentInfo(win_id)

Things now render correctly on OS X now! The render window misses 
resize events for one reason or another, but at least this is some 
progress. Reading through the mail list archives, it looks like the 
wxwindows people used this fix for a while also.

I'm sort of clueless here. Can anybody tell me why this change fixes 
the render problem?

Thanks,
Jed