mailing subject gets doubled

[Werner LEMBERG]

[mew 7ab02416029d0f15580efa3c4c3ff39f32d7c0ad (2022-11-29)]
[GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu,
GTK+ Version 3.24.34, cairo version 1.16.0) of 2023-02-01]

Please consider the attached e-mail, generated by Thunderbird 102.6.0.
If I reply to that by pressing 'R', the subject fields gets doubled
and looks like this:

```
Subject: Re: Tie not working as expected,Re: Tie not working as expected
```

It's very easy to miss that, not manually correcting it – I already
got complaints.

It seems to me that Mew has difficulties with OpenPGP/MIME signed
messages. Maybe the simplest solution is to accept a single 'Subject'
field only (namely the first)?


Werner

[Werner LEMBERG]

> If I reply to that by pressing 'R', the subject fields gets doubled

> and looks like this: [...]

This is now

https://github.com/kazu-yamamoto/Mew/issues/161


Werner