Fix bug in CovariateBlockState with filtered graphs

src/graph/community/graph_blockmodel_covariates.cc

@@ -139,7 +139,8 @@ struct cov_move_sweep_dispatch
                     vector<std::reference_wrapper<Vprop>>& mrm,
                     vector<std::reference_wrapper<Vprop>>& wr,
                     Vprop& b, vector<std::reference_wrapper<Vprop>>& bs,
-                    vector<std::reference_wrapper<GraphInterface>>& bgis, Graph& g,
+                    vector<std::reference_wrapper<GraphInterface>>& bgis,
+                    Graph& g,
                     vector<std::reference_wrapper<GraphInterface>>& ags,
                     vector<std::reference_wrapper<boost::any>>& emat,
                     vector<std::reference_wrapper<boost::any>>& sampler,
@@ -686,7 +687,8 @@ void do_split_graph(GraphInterface& gi, boost::any& aec, boost::any& ab,
     auto uvmap = from_any_list<vmap_t>(ouvmap);
 
     run_action<>()(gi, std::bind<void>(split_graph(), placeholders::_1,
-                                       std::ref(ec), std::ref(b), std::ref(eweight),
+                                       std::ref(ec), std::ref(b),
+                                       std::ref(eweight),
                                        std::ref(vweight), std::ref(vc),
                                        std::ref(vmap), std::ref(us),
                                        std::ref(ub),

src/graph_tool/community/covariate_blockmodel.py

@@ -171,7 +171,9 @@ class CovariateBlockState(BlockState):
                                  self.bmap,
                                  [_prop("v", u, u.vp["brmap"]) for u in self.gs],
                                  [_prop("v", u, u.vp["vmap"]) for u in self.gs])
-
+        if self.g.get_vertex_filter()[0] is not None:
+            for u in self.gs:
+                u.set_vertex_filter(u.new_vertex_property("bool", True))
         if not self.layers:
             total_state.master = True
             total_state.slave = False