GNU bug report logs - #21167
24.5; tags-search should ignore buffer restriction

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: phs <phs <at> lsv.ens-cachan.fr>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; tags-search should ignore buffer restriction
Date: Fri, 31 Jul 2015 11:43:39 +0200

Description: tags-search when going through all files listed in the 
current tags table, tags-search searches inside existing buffers for 
files that are currently visited (this is where the latest version can 
be found).

But when the visiting buffer has been restricted by a narrow-to-region, 
tags-search will not look outside the narrowed-to scope.

I call this a bug. E.g., it can cause a global renaming of variables 
miss some occurrences. It seems that a minimal fix is for tags-search to 
warn the user that the buffer has been narrowed and offer to widen for 
the search (and maybe reinstall the restriction after the search???).


I looked at the source code. It appears that the problem is located 
within function next-file (in progmodes/etags.el). When it is found that 
there already is a buffer visiting the file to be searched for tags, 
next-file just uses it without checking for restrictions.

BTW, I don't understand why next-file passes the novisit flag to find-file?

-- 
Philippe SCHNOEBELEN,       	                  www.lsv.ens-cachan.fr/~phs
LSV, CNRS UMR 8643 & ENS de Cachan   		  Tel: (+33/0) 147 407 530
"Algebraic symbols are used when you do not know what you are talking about"

Message #10 received at 21167-done <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: phs <phs <at> lsv.ens-cachan.fr>, 21167-done <at> debbugs.gnu.org
Subject: Re: bug#21167: 24.5; tags-search should ignore buffer restriction
Date: Sat, 1 Aug 2015 14:43:10 +0300

Version: 25.1

On 07/31/2015 12:43 PM, phs wrote:

> I call this a bug. E.g., it can cause a global renaming of variables
> miss some occurrences. It seems that a minimal fix is for tags-search to
> warn the user that the buffer has been narrowed and offer to widen for
> the search (and maybe reinstall the restriction after the search???).

Thanks for the report. This is now performed automatically, without 
warning, in tags-loop-continue.

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