notmuch-emacs replying produces excessive indenting on multipart/signed or multipart/mixed amil?

[David Edmondson]

On Mon, Apr 11 2016, Daniel Kahn Gillmor wrote:
> On Mon 2016-04-11 20:20:11 -0400, David Bremner wrote:
>> I have the feeling I don't understand the problem. I replied to your
>> message, and didn't see any extra indentation there. I thought my reply
>> to the list was test enough. So what am I missing?
>
> Aha, it is due to a setting, thanks.  it's due to
> notmuch-show-indent-multipart -- try setting it to "t" ?
>
> i find that setting useful during notmuch-show buffers, but i don't
> think it should apply when generating a reply message.

We can try binding it to nil during reply generation. Will generate
patch...