XREADGROUP sticks if reading from history

[kostasrim]

From stream_family.cc:

   if (opts.serve_history)
      range_res = OpRangeFromConsumerPEL(op_args, key, range_opts);
    else
      range_res = OpRange(op_args, key, range_opts);

The issue here is that serve_history is set if at least one of the streams consumes from PEL (not >). If any other stream uses >, it is ignored:

XREADGROUP GROUP mygroup worker1 STREAMS mystream > myother 123-0

We will incorrectly treat mystream as it's reading from history (instead of new messages >) which is a bug