Bug#1024997: install-info: dir entry for emacs is bolloxed

["Barak A. Pearlmutter" <bap@debian.org>]

Package: install-info
Version: 6.8-6+b1
Severity: normal
X-Debbugs-Cc: none, Barak A. Pearlmutter <bap@debian.org>
The directory file /usr/share/info/dir entry for emacs itself is messed
up, even after a clean regeneration.

Note the strange characters here that mess up the entry:

$ cat -v /usr/share/info/dir | egrep -2 '[(]emacs[)]'
* Magit: (magit).               Using Git from Emacs with Magit.
* With-Editor: (with-editor).   Using the Emacsclient as $EDITOR.
^ZM-^L}[^EM-^KM-6M-bd^E* Emacs: (emacs).               The extensible self-documenting text editor.
* Emacs FAQ: (efaq).            Frequently Asked Questions about Emacs.
* Haskell Mode: (haskell-mode). Haskell Development Environment for Emacs(en)

I'd also note that /usr/sbin/update-info-dir does not ignore *~ files,
but it *does* ignore symbolic links.

$ egrep find /usr/sbin/update-info-dir
find "$INFODIR" -type f | while read file ; do

$ ls -l /usr/share/info/emacs.info.gz
lrwxrwxrwx 1 root root 31 Sep 26  2019 /usr/share/info/emacs.info.gz -> /etc/alternatives/emacs.info.gz

In fact, one might wonder why the above "find" looks for anything other
than *.info.gz files.  One might also wonder whether install-info.c
needs to be rewritten from scratch in something sane, but I digress.

In any case, tracing through the construction of /usr/share/info/dir by
hot-wiring update-info-dir to pause after each invocation of
install-info, I found that the "bad" material is installed by processing
of /usr/share/info/mutt-alias.info.gz, which is installed because
emacs-goodies-el depends on elpa-mutt-alias, even though I do not have
mutt installed.

-- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (530, 'testing'), (520, 'proposed-updates'), (510, 'stable-updates'), (500, 'stable'), (450, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 6.0.0-4-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8), LANGUAGE=en_IE:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages install-info depends on:
ii  libc6  2.36-5

install-info recommends no packages.

install-info suggests no packages.

-- no debconf information