[gl2ps] Intra-quad lines when blending

[Fabian Wenzel]

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| It's most probably because we split quads into triangles for sorting
| purposes.

Yes, sorting may be a reason, but sometimes the lines do not look like
borders of triangles...

I have attached an example of a corrupted pdf-file and some OpenGL-code.
Those are the same files that I sent to Micha Bieber. He already
contacted me off-list and he offered to look into the stuff these days.

Thanks!

	Fabian
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