config: add client window criteria

src/config/handler.rs

@@ -1991,6 +1991,10 @@ impl ConfigProxyHandler {
                 match *field {}
             }
             WindowCriterionIpc::Types(t) => mgr.kind(*t),
+            WindowCriterionIpc::Client(c) => {
+                self.state.cl_matcher_manager.rematch_all(&self.state);
+                mgr.client(&self.state, &self.get_client_matcher(*c)?.node)
+            }
         };
         let cached = Rc::new(CachedCriterion {
             crit: criterion.clone(),