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This commit changes the behaviour of expose internal geometry for bsplines and makes it converge with the implementation for other complex forms.
This functionality now does not introduce constraints (the DoF is not affected by its execution).
BSplines, when created, are still created as polynomic. However, exposing previously deleted or otherwise hidden (increase of degree) poles does not
constraint them.
why?
While a priori the old behaviour is advantageous for the user in many situations, it severely breaks NURBS-ized shapes and gets in the way of bsplines after
increasing the degree of the bspline.
dcfd6d0b14