[Interest] renderPixmap and textures

[wargand at gmx.de]

Hi, me again. Still no solution for my problem. But fortunately now it is
only of academic nature. I would like to know if and what mistake I made
or if this is a Windows/OpenGL problem. However, I don't really need the
answer anymore. Discovered that I can also solve my problem with the 
QGLPixelBuffer. Probably even better than with renderPixmap.

Guido