bug#3136: 23.0.92; Customized variables include state string

When I change a string variable using the customize interface, the
line after the entry point for the string is included in the
string. So, customising the variable 'twitter-username' to 'fred' leads to:

,----
| 
|  '(twitter-username "fred
|    [State]: EDITED, shown value does not take effect until you set or save it.")
| 
`----

This behaviour has occurred for variables in several modes I have
tried to customise and is readily reproducible.


In GNU Emacs 23.0.92.1 (i486-pc-linux-gnu, GTK+ Version 2.16.1)
 of 2009-04-24 on elegiac, modified by Debian
 (emacs-snapshot package, version 1:20090423-1)
Windowing system distributor `The X.Org Foundation', version 11.0.10601000
configured using `configure  '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.92/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.92/site-lisp:/usr/share/emacs/site-lisp' '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''

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_AU.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Custom

Minor modes in effect:
  rcirc-track-minor-mode: t
  diff-auto-refine-mode: t
  desktop-save-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  display-time-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
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
c t o r i a SPC f o r SPC s c h o o l SPC c h a m p 
s . <backspace> <backspace> . <return> SPC <tab> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> SPC SPC SPC SPC SPC A s s <backspace> 
<backspace> <backspace> E x p <tab> <down-mouse-5> 
<mouse-5> <down-mouse-5> <mouse-5> <down-mouse-5> <mouse-5> 
O t h e r : S c h o o l SPC C h a m p i o n s h i p 
s : T e a m SPC f e e <return> <tab> <home> SPC SPC 
SPC SPC SPC <end> <tab> <up> <end> <tab> SPC SPC SPC 
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC <backspace> 
$ 1 4 0 . 0 0 C-x C-s <up> <down> C-x C-s <up> <up> 
<up> <up> <up> <up> <down> <down> <down> <down> <down> 
<home> C-SPC <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <up> <up> <up> <down> M-x 
<up> <up> <up> <return> ; <return> C-x C-s M-/ C-/ 
C-x C-s M-x c u s t o m <tab> - g r <tab> <return> 
t w i t t e r <return> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <down-mouse-4> <mouse-4> <help-echo> 
<help-echo> <down-mouse-1> <help-echo> <mouse-movement> 
<mouse-1> <help-echo> <help-echo> <help-echo> <down-mouse-1> 
<mouse-1> <help-echo> <down-mouse-1> <mouse-1> <help-echo> 
<down-mouse-1> <mouse-1> <help-echo> <down-mouse-1> 
<mouse-1> <help-echo> <help-echo> <down-mouse-1> <help-echo> 
<mouse-movement> <mouse-1> <help-echo> <down-mouse-1> 
<down-mouse-2> <help-echo> <help-echo> <help-echo> 
<help-echo> <down-mouse-1> <down-mouse-5> <mouse-5> 
<help-echo> <help-echo> <down-mouse-1> <help-echo> 
<mouse-movement> <mouse-2> <down-mouse-4> <mouse-4> 
<help-echo> <down-mouse-1> <mouse-2> <help-echo> <down-mouse-5> 
<mouse-5> <double-down-mouse-5> <double-mouse-5> <triple-down-mouse-5> 
<triple-mouse-5> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<down-mouse-5> <mouse-5> <down-mouse-4> <mouse-4> <down-mouse-4> 
<mouse-4> C-x C-s <help-echo> <help-echo> <help-echo> 
y e s <return> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <menu-bar> <help-menu> <se
nd-emacs-bug-report>

Recent messages:
Creating group members... 75%
Creating group magic...
Creating group state...
Creating group... done
Creating customization items ...done
Resetting customization items...done
Creating customization setup...done
byte-code: Beginning of buffer [2 times]
Saving file /home/cameron/.emacs...
Wrote /home/cameron/.emacs