forked from viewit/OrcaSlicer-KX
* Improve toolpath simplification to avoid blemishes when using Arachne on thin walls. * Avoid reducing closed perimeters below 3 points. Downstream code contains assumptions that closed ExtrusionLines are not degenerate. Open ExtrusionLines already are not reduced below 2 points by ExtrusionLine::simplify(). --------- Co-authored-by: SoftFever <softfeverever@gmail.com>