bug#37555: mml-attach-file ascii, big5

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: 積丹尼 Dan Jacobson
>>  <jidanni@jidanni.org>
>> Date: Mon, 30 Sep 2019 00:23:32 +0800
>> 
>> I used C-c C-a mml-attach-file and filled in the description with "提案"
>> and instead of 100% UTF we see ascii and big5 mentioned below.
>
> Why is that a problem?  The attachment should arrive intact to the
> other side, that's the only important thing, no?

The description shouldn't be mangled like that, though.  It looks like
it's been encoded twice:

Content-Description: =?us-ascii?Q?=3D=3Fbig5=3FB=3F0Eg=3D=3F=3D?=

There's a big5 base64 text in there that's then been qp-encoded and
marked as ASCII.

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