[debbugs-tracker] bug#12254: closed (24.2; completion fails backward-char)

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Your message dated Wed, 29 Aug 2012 14:05:19 -0400
with message-id <address@hidden>
and subject line Re: bug#12254: 24.2; completion fails backward-char
has caused the debbugs.gnu.org bug report #12254,
regarding 24.2; completion fails backward-char
to be marked as done.

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-- 
12254: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12254
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--- Begin Message --- Subject: 24.2; completion fails backward-char Date: Wed, 22 Aug 2012 10:40:25 +0800

This is a regression. It doesn't happen in Emacs 23.4.

1. Emacs -q -l b.el (b.el is attached)
2. M-x b-mode
3. Type I followed by <tab> to complete to IGNORE
4. C-b

In step 4, C-b could not move backwards; point appears to be trapped
there.

Leo

b.el
Description: b.el

--- End Message ---

> --- Begin Message ---
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> Subject: 
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> Re: bug#12254: 24.2; completion fails backward-char
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> Date: 
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> Wed, 29 Aug 2012 14:05:19 -0400
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> User-agent: 
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> Gnus/5.13 (Gnus v5.13) Emacs/24.2.50 (gnu/linux)
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> tags 12254 notabug
> thanks
>
> > (defun b-completion-at-point ()
> >   (let ((beg (progn
> >                (skip-syntax-backward "w")
> >                (point)))
> >         (end (progn
> >                (skip-syntax-forward "w")
> >                (point))))
> >     (list beg end '("IGNORE" "DEBUG" "HELLO"))))
>
> This needs to save-excursion.
>
> > This is a regression. It doesn't happen in Emacs 23.4.
>
> That's only because completion-at-point-functions is used less often so
> the bug in the above code doesn't bite as often.
> But your above completion function is already buggy in Emacs-23.4 since
> it can't complete "IG!R" to "IGNORE", whereas after adding the
> save-excursion such completion works just fine.
>
>
>         Stefan
>
>
> --- End Message ---