bug#5524: 23.1.92; `initials' completion style doesn't work as documented

[Tassilo Horn]

The docstring of the `initials' completion style (documented in
`completion-styles-alist') says:

  Completion of acronyms and initialisms.
  E.g. can complete M-x lch to list-command-history
  and C-x C-f ~/sew to ~/src/emacs/work.

While the M-x example works, the find-file example doesn't (with emacs
-Q).  For example, I have ~/repos/org/uni.org, but

  C-x C-f ~/rou TAB

says [no match].  Same for

  C-x C-f /hh TAB

although there's /home/horn/.


In GNU Emacs 23.1.92.1 (x86_64-pc-linux-gnu, GTK+ Version 2.18.6)
 of 2010-02-02 on thinkpad
Windowing system distributor `The X.Org Foundation', version 11.0.10704901
configured using `configure  '--prefix=/usr' '--build=x86_64-pc-linux-gnu' 
'--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man' 
'--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' 
'--localstatedir=/var/lib' '--libdir=/usr/lib64' 
'--program-suffix=-emacs-23-vcs' '--infodir=/usr/share/info/emacs-23-vcs' 
'--with-sound' '--with-x' '--with-gconf' '--without-toolkit-scroll-bars' 
'--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' 
'--with-xpm' '--with-xft' '--with-libotf' '--with-m17n-flt' 
'--with-x-toolkit=gtk' '--without-hesiod' '--without-kerberos' 
'--without-kerberos5' '--with-gpm' '--with-dbus' 
'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu' 
'CFLAGS=-march=core2 -O2 -pipe' 'LDFLAGS=-Wl,-z,now''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  rcirc-track-minor-mode: t
  paredit-mode: t
  eldoc-mode: t
  highlight-symbol-mode: t
  hi-lock-mode: t
  outline-minor-mode: t
  highlight-parentheses-mode: t
  recentf-mode: t
  icomplete-mode: t
  window-number-meta-mode: t
  window-number-mode: t
  exec-abbrev-cmd-mode: t
  global-subword-mode: t
  subword-mode: t
  savehist-mode: t
  show-paren-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<right> <right> <right> <left> <left> <left> <left> 
<left> <left> <left> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <up> 
<up> <left> <left> <left> <left> <left> <return> M-1 
M-2 <down> <down> C-k M-1 SPC C-y <left> <M-backspace> 
i n i t i a l s <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> ' C-e C-x C-e <return> 
<left> C-x C-e C-x C-f <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> r p <backspace> o p <tab> <tab> <tab> <tab> 
<tab> <tab> <backspace> <backspace> <backspace> <backspace> 
<backspace> r o p <tab> <backspace> <tab> <tab> <backspace> 
<backspace> / h h r o <tab> <tab> <tab> <tab> C-g M-2 
M-1 <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> C-h v <return> M-2 <tab> <tab> <return> M-1 
C-x C-f <M-backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> / o / C-g M-x l c h <tab> <tab> 
C-g C-x x l c h <tab> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
o r <tab> <tab> <backspace> r <tab> <tab> C-g C-x C-f 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> o <tab> <tab> <tab> 
p . o <tab> <tab> C-g <down-mouse-1> <mouse-movement> 
<mouse-movement> <drag-mouse-1> <help-echo> <help-echo> 
C-g <up> C-SPC <down> M-w C-x C-s C-x C-f <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
/ h h <tab> <backspace> C-g M-x r e b <return>

Recent messages:
Auto-saving...done
mouse-2, RET: find variable's definition
mouse-2, RET: describe this variable
Quit [2 times]
Making completion list... [2 times]
Quit [3 times]
Mark activated
Saving file /home/horn/repos/configs/dot-emacs.el...
Wrote /home/horn/repos/configs/dot-emacs.el
Quit

Load-path shadows:
~/repos/el/org-mode/lisp/org-bbdb hides 
/usr/share/emacs/23.1.92/lisp/org/org-bbdb
~/repos/el/org-mode/lisp/org-habit hides 
/usr/share/emacs/23.1.92/lisp/org/org-habit
~/repos/el/org-mode/lisp/org-colview hides 
/usr/share/emacs/23.1.92/lisp/org/org-colview
~/repos/el/org-mode/lisp/org-footnote hides 
/usr/share/emacs/23.1.92/lisp/org/org-footnote
~/repos/el/org-mode/lisp/org-freemind hides 
/usr/share/emacs/23.1.92/lisp/org/org-freemind
~/repos/el/org-mode/lisp/org-compat hides 
/usr/share/emacs/23.1.92/lisp/org/org-compat
~/repos/el/org-mode/lisp/org-icalendar hides 
/usr/share/emacs/23.1.92/lisp/org/org-icalendar
~/repos/el/org-mode/lisp/org-clock hides 
/usr/share/emacs/23.1.92/lisp/org/org-clock
~/repos/el/org-mode/lisp/org-bibtex hides 
/usr/share/emacs/23.1.92/lisp/org/org-bibtex
~/repos/el/org-mode/lisp/org-indent hides 
/usr/share/emacs/23.1.92/lisp/org/org-indent
~/repos/el/org-mode/lisp/org-faces hides 
/usr/share/emacs/23.1.92/lisp/org/org-faces
~/repos/el/org-mode/lisp/org-timer hides 
/usr/share/emacs/23.1.92/lisp/org/org-timer
~/repos/el/org-mode/lisp/org-vm hides /usr/share/emacs/23.1.92/lisp/org/org-vm
~/repos/el/org-mode/lisp/org-list hides 
/usr/share/emacs/23.1.92/lisp/org/org-list
~/repos/el/org-mode/lisp/org-gnus hides 
/usr/share/emacs/23.1.92/lisp/org/org-gnus
~/repos/el/org-mode/lisp/org-crypt hides 
/usr/share/emacs/23.1.92/lisp/org/org-crypt
~/repos/el/org-mode/lisp/org-exp hides /usr/share/emacs/23.1.92/lisp/org/org-exp
~/repos/el/org-mode/lisp/org-protocol hides 
/usr/share/emacs/23.1.92/lisp/org/org-protocol
~/repos/el/org-mode/lisp/org-inlinetask hides 
/usr/share/emacs/23.1.92/lisp/org/org-inlinetask
~/repos/el/org-mode/lisp/org-wl hides /usr/share/emacs/23.1.92/lisp/org/org-wl
~/repos/el/org-mode/lisp/org-plot hides 
/usr/share/emacs/23.1.92/lisp/org/org-plot
~/repos/el/org-mode/lisp/org-w3m hides /usr/share/emacs/23.1.92/lisp/org/org-w3m
~/repos/el/org-mode/lisp/org-agenda hides 
/usr/share/emacs/23.1.92/lisp/org/org-agenda
~/repos/el/org-mode/lisp/org-archive hides 
/usr/share/emacs/23.1.92/lisp/org/org-archive
~/repos/el/org-mode/lisp/org-attach hides 
/usr/share/emacs/23.1.92/lisp/org/org-attach
~/repos/el/org-mode/lisp/org-latex hides 
/usr/share/emacs/23.1.92/lisp/org/org-latex
~/repos/el/org-mode/lisp/org-mhe hides /usr/share/emacs/23.1.92/lisp/org/org-mhe
~/repos/el/org-mode/lisp/org-irc hides /usr/share/emacs/23.1.92/lisp/org/org-irc
~/repos/el/org-mode/lisp/org-table hides 
/usr/share/emacs/23.1.92/lisp/org/org-table
~/repos/el/org-mode/lisp/org-info hides 
/usr/share/emacs/23.1.92/lisp/org/org-info
~/repos/el/org-mode/lisp/org-docbook hides 
/usr/share/emacs/23.1.92/lisp/org/org-docbook
~/repos/el/org-mode/lisp/org-ascii hides 
/usr/share/emacs/23.1.92/lisp/org/org-ascii
~/repos/el/org-mode/lisp/org-jsinfo hides 
/usr/share/emacs/23.1.92/lisp/org/org-jsinfo
~/repos/el/org-mode/lisp/org-id hides /usr/share/emacs/23.1.92/lisp/org/org-id
~/repos/el/org-mode/lisp/org-feed hides 
/usr/share/emacs/23.1.92/lisp/org/org-feed
~/repos/el/org-mode/lisp/org-xoxo hides 
/usr/share/emacs/23.1.92/lisp/org/org-xoxo
~/repos/el/org-mode/lisp/org-publish hides 
/usr/share/emacs/23.1.92/lisp/org/org-publish
~/repos/el/org-mode/lisp/org-exp-blocks hides 
/usr/share/emacs/23.1.92/lisp/org/org-exp-blocks
~/repos/el/org-mode/lisp/org-mew hides /usr/share/emacs/23.1.92/lisp/org/org-mew
~/repos/el/org-mode/lisp/org-mobile hides 
/usr/share/emacs/23.1.92/lisp/org/org-mobile
~/repos/el/org-mode/lisp/org-datetree hides 
/usr/share/emacs/23.1.92/lisp/org/org-datetree
~/repos/el/org-mode/lisp/org-remember hides 
/usr/share/emacs/23.1.92/lisp/org/org-remember
~/repos/el/org-mode/lisp/org-macs hides 
/usr/share/emacs/23.1.92/lisp/org/org-macs
~/repos/el/org-mode/lisp/org-mouse hides 
/usr/share/emacs/23.1.92/lisp/org/org-mouse
~/repos/el/org-mode/lisp/org-html hides 
/usr/share/emacs/23.1.92/lisp/org/org-html
~/repos/el/org-mode/lisp/org-install hides 
/usr/share/emacs/23.1.92/lisp/org/org-install
~/repos/el/org-mode/lisp/org-src hides /usr/share/emacs/23.1.92/lisp/org/org-src
~/repos/el/org-mode/lisp/org hides /usr/share/emacs/23.1.92/lisp/org/org
~/repos/el/org-mode/lisp/org-rmail hides 
/usr/share/emacs/23.1.92/lisp/org/org-rmail
~/repos/el/org-mode/lisp/org-mac-message hides 
/usr/share/emacs/23.1.92/lisp/org/org-mac-message

Features:
(shadow emacsbug debug cl-specs edebug find-func help-mode mailalias
hippie-exp multi-isearch hl-line url-cache newst-plainview newst-ticker
newst-reader newst-backend gnus-fun flow-fill bbdb-gui gnus-cite smiley
ansi-color gnus-async gnus-bcklg sort gnus-ml org-colview mule-util
cal-move view solar cal-dst holidays hol-loaddefs cal-iso gnus-topic
parse-time pop3 nnml utf-7 utf7 auth-source nnimap imap trace nndraft
nnmh nnnil gnus-agent gnus-srvr gnus-score score-mode nnvirtual nntp
gnus-cache notmuch spam spam-stat gnus-uu yenc gnus-msg epa-file epa epg
garak elim lui tracking flyspell ispell incomplete rcirc-late-fix rcirc
greqlscript-mode greql-mode tg-mode generic th-latex swank-clojure
clojure-mode slime-repl slime apropos hideshow paredit wtf cus-edit
cus-start cus-load rdictcc appt diary-lib diary-loaddefs vc-git org-w3m
org-irc org-jsinfo org-infojs org-html org-exp org-exp-blocks org-info
org-gnus org-docview org-bibtex org-bbdb org-protocol org-attach org-id
org-agenda remember org-remember org-datetree org org-footnote org-src
org-list org-faces org-compat org-macs org-install cal-menu calendar
cal-loaddefs dired-x dired-aux pcomplete em-term term ehelp electric
esh-var esh-io esh-cmd esh-ext esh-proc esh-arg eldoc esh-groups eshell
esh-util esh-module esh-mode lisppaste xml-rpc xml th-boxquote boxquote
rect highlight-symbol hi-lock footnote smtpmail bbdb-hooks bbdb-gnus
gnus-art mm-uu mml2015 epg-config mm-view smime dig gnus-sum nnoo
gnus-group gnus-undo nnmail mail-source format-spec gnus-start gnus-spec
gnus-int gnus-range message idna sendmail ecomplete mml mml-sec
password-cache mm-decode mm-bodies mm-encode gmm-utils mailheader
canlock sha1 hex-util hashcash gnus-win bbdb-snarf mail-extr rfc822
bbdb-com warnings mailabbrev info server yasnippet dropdown-list
noutline outline highlight-parentheses browse-kill-ring derived filesets
recentf tree-widget sr-speedbar speedbar sb-image ezimage dframe
icomplete anything-config compile comint ring semantic/util-modes
semantic/util semantic semantic/tag semantic/lex semantic/fw eieio
byte-opt bytecomp byte-compile mode-local cedet imenu w3m-bookmark w3m
browse-url doc-view jka-compr image-mode w3m-hist w3m-fb w3m-ems w3m-ccl
ccl w3m-favicon w3m-image w3m-proc w3m-util bookmark pp ffap dired rx
thingatpt anything woman easymenu man assoc window-number uniquify
exec-abbrev-cmd easy-mmode cl cl-19 subword saveplace savehist paren
th-private edmacro kmacro th-common mm-url gnus gnus-ems nnheader
gnus-util netrc mail-utils wid-edit url-http tls url url-proxy
url-privacy url-expand url-methods url-history mailcap url-auth
mail-parse rfc2231 rfc2047 rfc2045 qp ietf-drums time-date url-cookie
url-util url-parse url-gw url-vars mm-util mail-prsvr windmove
disp-table swank-clojure-autoloads advice help-fns advice-preload
clojure-mode-autoloads slime-repl-autoloads slime-autoloads package
reporter site-gentoo w3m-load preview-latex bbdb-autoloads bbdb
regexp-opt timezone tex-site auto-loads tooltip ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd font-setting tool-bar dnd fontset
image fringe lisp-mode register page menu-bar rfn-eshadow timer select
scroll-bar mldrag mouse jit-lock font-lock syntax facemenu font-core
frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
simple abbrev loaddefs button minibuffer faces cus-face files
text-properties overlay md5 base64 format env code-pages mule custom
widget hashtable-print-readable backquote make-network-process dbusbind
system-font-setting font-render-setting gtk x-toolkit x multi-tty emacs)