GNU bug report logs - #12254
24.2; completion fails backward-char

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#12254: closed (24.2; completion fails backward-char)
Date: Wed, 29 Aug 2012 18:07:02 +0000

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Your message dated Wed, 29 Aug 2012 14:05:19 -0400
with message-id <jwvsjb5fuha.fsf-monnier+emacs <at> gnu.org>
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.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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12254: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12254
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From: Leo <sdl.web <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2; completion fails backward-char
Date: Wed, 22 Aug 2012 10:40:25 +0800

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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

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Leo <sdl.web <at> gmail.com>
Cc: 12254-done <at> debbugs.gnu.org
Subject: Re: bug#12254: 24.2; completion fails backward-char
Date: Wed, 29 Aug 2012 14:05:19 -0400

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

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