WIP still with arrange return value.

src/libnest2d/include/libnest2d/geometry_traits.hpp

@@ -192,7 +192,7 @@ public:
         return Unit(width())*height();
     }
     
-    static inline _Box infinite(const P &center);
+    static inline _Box infinite(const P &center = {TCoord<P>(0), TCoord<P>(0)});
 };
 
 template<class S> struct PointType<_Box<S>> { 

src/libnest2d/include/libnest2d/libnest2d.hpp

@@ -908,7 +908,8 @@ private:
             item.removeOffset();
         });
         
-        if(stopfn_ && !stopfn_()) { // Ignore results if nesting was stopped.
+        if(!stopfn_ || (stopfn_ && !stopfn_())) {
+            // Ignore results if nesting was stopped.
             const PackGroup& bins = lastResult();
             unsigned binidx = 0;
             for(auto& bin : bins) {