fix Duel.SSet (#250)

* fix Duel.SSet

* fix EFFECT_SSET_COST

libduel.cpp

@@ -448,7 +448,11 @@ int32 scriptlib::duel_sets(lua_State *L) {
 	} else
 		luaL_error(L, "Parameter %d should be \"Card\" or \"Group\".", 2);
 	pduel->game_field->add_process(PROCESSOR_SSET_G, 0, pduel->game_field->core.reason_effect, pgroup, playerid, toplayer, confirm);
-	return lua_yield(L, 0);
+	return lua_yieldk(L, 0, (lua_KContext)pduel, [](lua_State *L, int32 status, lua_KContext ctx) {
+		duel* pduel = (duel*)ctx;
+		lua_pushinteger(L, pduel->game_field->returns.ivalue[0]);
+		return 1;
+	});
 }
 int32 scriptlib::duel_create_token(lua_State *L) {
 	check_action_permission(L);

operations.cpp

@@ -2386,6 +2386,17 @@ int32 field::sset_g(uint16 step, uint8 setplayer, uint8 toplayer, group* ptarget
 			returns.ivalue[0] = 0;
 			return TRUE;
 		}
+		effect_set eset;
+ 		for(auto& pcard : *set_cards) {
+			eset.clear();
+			pcard->filter_effect(EFFECT_SSET_COST, &eset);
+			for(int32 i = 0; i < eset.size(); ++i) {
+				if(eset[i]->operation) {
+					core.sub_solving_event.push_back(nil_event);
+					add_process(PROCESSOR_EXECUTE_OPERATION, 0, eset[i], 0, setplayer, 0);
+				}
+			}
+		}
 		core.set_group_pre_set.clear();
 		core.set_group_set.clear();
 		core.set_group_used_zones = 0;