d5ce1321ca
* Added AreaNthSelector Added AreaNthSelector that is useful for nested features selection. Especially to select one of coplanar nested wires for subsequent extrusion, cutting or filleting. * LengthNthSelector * Explicitly marked _NthSelector class and _NthSelector.key(..) method as abstract using standard abc package * AreaNthSelector ignores "bad" Wires AreaNthSelector.key raises ValueError if temporary face creation fails for a wire for any reason (non-planar, non-closed). That causes _NthSelector that it inherits to ignore such wires. Done so for consistency with RadiusNthSelector that ignores anything it can not get radius from. Co-authored-by: Marcus Boyd <mwb@geosol.com.au>
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