Fixed regression causing random failures in bridge direction detection. #2636

xs/src/libslic3r/ExPolygonCollection.cpp

@@ -112,6 +112,16 @@ ExPolygonCollection::lines() const
     return lines;
 }
 
+Polygons
+ExPolygonCollection::contours() const
+{
+    Polygons contours;
+    for (ExPolygons::const_iterator it = this->expolygons.begin(); it != this->expolygons.end(); ++it) {
+        contours.push_back(it->contour);
+    }
+    return contours;
+}
+
 #ifdef SLIC3RXS
 REGISTER_CLASS(ExPolygonCollection, "ExPolygon::Collection");
 #endif