anchor.diff:              {Callback, UserAcc} = get_callback_acc(CallbackAcc),
               Self = self(),
               {ok, Notify} = couch_db_update_notifier:start_link(
  -                fun({_, DbName}) when DbName == Db#db.name ->
  +                fun({_, DbName}) when  Db0#db.name == DbName ->
                       Self ! db_updated;
                   (_) ->
                       ok
                   end
               ),
  +            {Db, StartSeq} = Start(),
               UserAcc2 = start_sending_changes(Callback, UserAcc, Feed),
               {Timeout, TimeoutFun} = get_changes_timeout(Args, Callback),
               Acc0 = build_acc(Args, Callback, UserAcc2, Db, StartSeq,
  
positive.code:         dir = Dir,
          since = Since
      } = Args1,
      {FilterFun, FilterArgs} = make_filter_fun(FilterName, Style, Req, Db),
      Args = Args1#changes_args{filter_fun = FilterFun, filter_args = FilterArgs},
      StartSeq = case Dir of
      rev ->
          couch_db:get_update_seq(Db);
      fwd ->
          Since
      end,
      % begin timer to deal with heartbeat when filter function fails
      case Args#changes_args.heartbeat of
  
negative.code:             {Callback, UserAcc} = get_callback_acc(CallbackAcc),
              UserAcc2 = start_sending_changes(Callback, UserAcc, Feed),
              {Timeout, TimeoutFun} = get_changes_timeout(Args, Callback),
              {Db, StartSeq} = Start(),
              Acc0 = build_acc(Args#changes_args{feed="normal"}, Callback,
                               UserAcc2, Db, StartSeq, <<>>, Timeout, TimeoutFun),
              {ok, #changes_acc{seq = LastSeq, user_acc = UserAcc3}} =
  