Bugfix: correct ArcArcTangentArc
tangency with reversed start_arc in algebra mode
#1000
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When
start_arc
has a reversed direction resulting in a negative plane normal in algebra mode, the resulting arc was drawn with the center facing the wrong way.ArcArcTangentArc
now checks the tangency of the resulting arc and flips the arc if necessary.Resolves #983
black did some unrelated formatting I left in.