Get BSpline and a test for it working. #7515
Merged
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This closes #7513 . It uses the code in that issue as a loose basis.
Non-continuous splines were pretty severely broken, but so was the sloppy AI-generated code testing the whole class. The test code assumed that splines were essentially straight lines, and "curve == line" is obviously false to a human being. The code was useful as a basis, but the test data was not, and caused test failures to appear incorrectly in some places.
I'm not sure this works in all cases, but it passes more than it did before. I had to guess at what some of the intended behavior was without any meaningful docs, also.