message: fix connect_polygons
diff: @@ -709,8 +709,8 @@ namespace RINGMesh {
  index_t adj_local_vertex =
  polygon_vertices[local_vertex].local_vertex_;
  index_t adj_next_vertex =
  - this->surface_mesh_->polygon_vertex( polygon,
  - this->surface_mesh_->next_polygon_vertex( polygon,
  + this->surface_mesh_->polygon_vertex( adj_polygon,
  + this->surface_mesh_->next_polygon_vertex( adj_polygon,
  adj_local_vertex ) );
  if( adj_next_vertex == vertex ) {
  this->set_polygon_adjacent( polygon, v, adj_polygon );
  