bug#7230: 24.0.50; Regression: Many dictionaries not found by ispell.el

[Knut Anders Hatlen <kahatlen@gmail.com>]

On a system with Aspell 0.60.6 with English dictionaries installed,
evaluating the following expression successfully changes the dictionary
on Emacs 23.2:

(progn
  (require 'ispell)
  (ispell-change-dictionary "british-ize"))

On Emacs 24 it fails:

Debugger entered--Lisp error: (error "Undefined dictionary: british-ize")
  signal(error ("Undefined dictionary: british-ize"))
  error("Undefined dictionary: %s" "british-ize")
  ispell-change-dictionary("british-ize")
  (progn (require (quote ispell)) (ispell-change-dictionary "british-ize"))

Comparing ispell-dictionary-alist on Emacs 23.2 and Emacs 24, it looks
like the following dictionaries are not found by ispell.el on Emacs 24:

  canadian
  canadian-wo_accents
  canadian-w_accents
  british-wo_accents
  british-w_accents
  british-ize
  british-ize-wo_accents
  british-ize-w_accents
  british-ise
  british-ise-wo_accents
  british-ise-w_accents
  american-wo_accents
  american-w_accents
  en_CA
  en_CA-w_accents
  en_CA-wo_accents
  en_GB
  en_GB-ise
  en_GB-ise-w_accents
  en_GB-ise-wo_accents
  en_GB-ize
  en_GB-ize-w_accents
  en_GB-ize-wo_accents
  en_GB-w_accents
  en_GB-wo_accents
  en_US
  en_US-w_accents
  en_US-wo_accents

The new behaviour was introduced by this change:

------------------------------------------------------------
revno: 100614
committer: Agustin martin <agustin.martin@hispalinux.es>
branch nick: trunk
timestamp: Thu 2010-06-17 16:44:34 +0200
message:
  ispell.el (ispell-aspell-find-dictionary): Fix regexp for full xx_YY search.
  
  This is needed for languages like Portuguese where there are aspell dicts
  for pt_BR and pt_PT, not for plain pt. If we strip country part 
  `ispell-aspell-find-dictionary' does not find dicts for portuguese.
------------------------------------------------------------




In GNU Emacs 24.0.50.1 (x86_64-pc-solaris2.11, GTK+ Version 2.20.0)
 of 2010-10-17 on ugle
Windowing system distributor `Oracle Corporation, based on X.Org Foundation sources', version 11.0.10707000
configured using `configure  '--build=x86_64-pc-solaris2.11' '--prefix=/opt/emacs24' '--with-imagemagick' 'PKG_CONFIG_PATH=/usr/lib/64/pkgconfig' 'CC=/usr/gcc/4.3/bin/gcc -m64' 'build_alias=x86_64-pc-solaris2.11''

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: @im=iiimx
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-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-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<escape> x r e p o r t - e m a c s <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr message sendmail regexp-opt rfc822 mml
easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mailabbrev mail-utils
gmm-utils mailheader emacsbug tooltip ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image fringe
lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
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
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

-- 
Knut Anders