mutt: GPGME shows begin pgp signed message for inline message

((note that this bug only happens with inline signature, not with mime signed))

I also checked against the latest version (1.14.4) and it is still happening

https://bugs.debian.org/861572

The last mail to debian-devel-announce looked like this for me:

| [-- Begin signature information --]
| Good signature from: Chris Lamb <chris@chris-lamb.co.uk>
|                 aka: Chris Lamb <lamby@gnu.org>
|                 aka: Chris Lamb <lamby@debian.org>
|             created: Sun 30 Apr 2017 10:40:26 PM CEST
| [-- End signature information --]
| 
| [-- BEGIN PGP SIGNED MESSAGE --]
| 
| -----BEGIN PGP SIGNED MESSAGE-----
| Hash: SHA256
| 
| Hi,

It's an inline signature, and I have pgp_auto_decode=yes set.

In older version I didn't see those lines:
| -----BEGIN PGP SIGNED MESSAGE-----
| Hash: SHA256

They're not part of the signed message. It really shouldn't be showing that to me.

If I set crypt_use_gpgme=no those lines go away.

I'm really using 1.7.2-1, but I assume it has that behaviour since 1.7.0-2 based on the NEWS file.