Subject: bug#12254: closed (Re: bug#12254: 24.2; completion fails backward-char)

From: [email-masked] (GNU bug Tracking System)
Date: Wed, 29 Aug 2012 18:07:02 +0000

Your bug report

#12254: 24.2; completion fails backward-char

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
12254: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12254
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: bug#12254: 24.2; completion fails backward-char
From: Stefan Monnier <[email-masked]>
To: Leo <[email-masked]>
Cc: [email-masked]
Date: Wed, 29 Aug 2012 14:05:19 -0400
List-Id: <debbugs-submit.debbugs.gnu.org>

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

Subject: 24.2; completion fails backward-char
From: Leo <[email-masked]>
To: [email-masked]
Date: Wed, 22 Aug 2012 10:40:25 +0800
List-Id: <debbugs-submit.debbugs.gnu.org>

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