remove adjeacencies along internal lines on both polygon edge

Author: BenPinet

src/geode/model/helpers/detail/split_along_surface_mesh_borders.cpp

@@ -219,7 +219,19 @@ namespace geode
                         }
                         for( auto& edge : it->second )
                         {
-                            edges.emplace_back( std::move( edge ) );
+                            const auto& surface_mesh = surface.mesh();
+                            const auto& edge_vertices =
+                                surface_mesh.polygon_edge_vertices( edge );
+                            edges.emplace_back(
+                                surface_mesh
+                                    .polygon_edge_from_vertices(
+                                        edge_vertices[0], edge_vertices[1] )
+                                    .value() );
+                            edges.emplace_back(
+                                surface_mesh
+                                    .polygon_edge_from_vertices(
+                                        edge_vertices[1], edge_vertices[0] )
+                                    .value() );
                         }
                     }
                 }