[Pkg-gnupg-maint] Bug#773705: gnupg: gpg(1) documents "--list-options show-usage", but gpg says "unknown option `show-usage'"

[Axel Beckert]

Package: gnupg
Version: 1.4.18-6

Dear GnuPG Maintainers,

gpg(1) contains:

       --list-options parameters
              This is a space or comma delimited string that gives
              options used when listing keys and signatures (that is,
              --list-keys, --list-sigs, --list-public-keys,
              --list-secret-keys, and the --edit-key functions).
              Options can be prepended with a no- (after the two dashes)
              to give the opposite meaning.  The options are:

       […]

       show-usage
                     Show usage information for keys and subkeys in the
                     standard key listing.  This is a list of letters
                     indicating the allowed usage for a key
                     (E=encryption, S=signing, C=certification,
                     A=authentication).  Defaults to no.

But if I try to use it, gpg bails out:

→ gpg --list-options show-usage --list-keys
gpg: unknown option `show-usage'
gpg: invalid list options
→

gpg2 actually understands that option, so I suspect this is a mixup of
gpg/gpg2 in gpg's man page. But it doesn't seem to have happened
upstream -- it came in via debian/patches/sync-docs-with-upstream.patch.

-- System Information:
Debian Release: 8.0
  APT prefers unstable
  APT policy: (990, 'unstable'), (600, 'testing'), (110, 'experimental'), (109, 'buildd-unstable'), (109, 'buildd-experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.18.0-trunk-amd64 (SMP w/4 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnupg depends on:
ii  gpgv          1.4.18-6
ii  libbz2-1.0    1.0.6-7+b2
ii  libc6         2.19-13
ii  libreadline6  6.3-8+b2
ii  libusb-0.1-4  2:0.1.12-25
ii  zlib1g        1:1.2.8.dfsg-2+b1

Versions of packages gnupg recommends:
ii  gnupg-curl     1.4.18-6
ii  libldap-2.4-2  2.4.40-3

Versions of packages gnupg suggests:
pn  gnupg-doc     <none>
ii  imagemagick   8:6.8.9.9-3
ii  libpcsclite1  1.8.13-1
ii  parcimonie    0.8.4-1

-- no debconf information