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dabbrev can hang in presence of fields

From: Roman Belenov
Subject: dabbrev can hang in presence of fields
Date: 06 Mar 2002 15:38:35 +0300
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.

In GNU Emacs 21.1.1 (i386-msvc-nt5.0.2195)
 of 2001-10-22 on NNWRBELENOV21
configured using `configure --with-msvc (12.00) --cflags /G6'
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: C
  locale-coding-system: cp1251-dos
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

The symptom is that dabbrev in minibuffer hangs when "inviolable"
minibuffer prompt property is set and inhibit-field-text-motion is nil
(the default value). The reason is the following code in

          (while (and (looking-at dabbrev--abbrev-char-regexp)
                      (not (bobp)))
            (forward-char -1))

(forward-char -1) does nothing on the field boundary while (bobp) is

Temporarily binding inhibit-field-text-motion to t in
dabbrev--goto-start-of-abbrev fixes the problem

Recent input:
<down> <down> <down> <down> <down> <down> <down> SPC 
<backspace> <down> <up> <down> <down> <down> <down> 
<down> <next> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <up> <prior> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <up> <up> <up> <up> C-x k <return> <return> 
M-x f o M-/ C-g <up> <up> <home> ; <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<end> <left> C-x C-e M-x f o M-/ M-x <up> <return>

Recent messages:
Wrote d:/apps/emacs-21/lisp/dabbrev.el
cond: No further dynamic expansion for `tv' found
call-interactively: Quit [2 times]
Loading emacsbug...done
Fontifying *mail to address@hidden (regexps...........)
call-interactively: Quit
minibuffer-avoid-prompt: Quit
call-interactively: Quit
                                                        With regards, Roman.

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