On Wed, Oct 24, 2012 at 11:28:29PM +0200, Krzysztof Mazur wrote:

> For raw subjects rfc2047 quoting is needed not only for non-ASCII characters,
> but also for any possible rfc2047 in it.
> [...]
> -     return ($s =~ /[^[:ascii:]]/);
> +     return ($s =~ /[^[:ascii:]]/) || ($s =~ /=\?/);

Very nice and obvious bug-fix made easy by the previous refactoring. :)

> ---
> Oops, this ugly Subject was generated by git format-patch (both 1.8.0
> and km/send-email-compose-encoding).

Yeah, format-patch has the same behavior (to encode when we see "=?").
So we know it is working. It is perhaps overkill in this case, since
there is not technically a valid encoded-word, and a smart parser would
be able to see that it should leave it alone. But it is probably better
to be slightly conservative in what we generate (and the "=?" token is
unlikely to come up in day-to-day usage).

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