bug#29918: 26.0.90; serial-term error in process filter

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Date: Wed, 17 Jul 2019 07:36:34 -0400
> Cc: 29918@debbugs.gnu.org, Gemini Lasswell <gazally@runbox.com>
> 
> If I understand the backtrace correctly, then the problem is that I
> didn't think of the case where the whole string fails to decode.  I
> think the patch below should fix it

Yes, I think you are right.

> there is a possibility it prevents correct decoding in case the
> terminal receives a utf-8 character in single byte chunks (though
> I'm not sure if it's even valid for a program to emit single bytes
> like that).

I agree.

Thanks.