Testing only one pixel of one triangle against one clip plane meant that many types of incorrect clipping would be missed. Add more clip clip plane and more probed pixels to check clipping that is incorrectly set up.
Created attachment 40435 [details] [review] Improve user-clip test
tests/spec/gl-1.0/user-clip-all-planes.c introduced by d42857290c3b2916490dca29c807b4ac01d8025d checks all available user clip planes.
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