GNU bug report logs - #7351
24.0.50; next-error no longer takes into account buffer modifications

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

From: Paul Pogonyshev <pogonyshev <at> gmx.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.50; next-error no longer takes into account buffer modifications
Date: Sun, 7 Nov 2010 01:26:27 +0200

When hitting C-x ` (next-error) the point is positioned correctly only
if the buffer is not modified.  If number of lines before the target
position is changed, point is positioned wrongly.

For instance, say 'test.txt' contains these lines:

    foo
    bar
    baz

I then run 'grep' from Emacs like this:

    grep -nH -e ba test.txt

Results:

    -*- mode: grep; default-directory: "/home/paul/test/" -*-
    Grep started at Sun Nov  7 01:25:17

    grep -nH -e ba test.txt
    test.txt:2:bar
    test.txt:3:baz

    Grep finished (matches found) at Sun Nov  7 01:25:17

Then I insert a few more lines in 'test.txt' buffer:

    foo
    bar
    spam
    ham
    baz

Now if I hit C-x ` the first time point is moved to line 2 --
correctly.  The second time, however, the point is moved to line 3,
i.e. the original location of 'baz'.  However, 'baz' is now at line 5
and that's where I expect C-x ` to move point to.  Note that at no
point I closed the buffer, so Emacs should be able to track changes
between 'grep' run and current buffer/file contents.

This is especially unhelpful with compilation errors.  Often, you'd go
through errors fixing them in process, sometimes adding or removing
lines.  However, any such change makes finding subsequent errors
difficult as C-x ` will no longer locate errors correctly.

I believe this used to work fine in past.

Paul

Message #10 received at 7351 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Paul Pogonyshev <pogonyshev <at> gmx.net>
Cc: 7351 <at> debbugs.gnu.org
Subject: Re: bug#7351: 24.0.50;
	next-error no longer takes into account buffer modifications
Date: Wed, 10 Nov 2010 19:49:33 -0500

Paul Pogonyshev wrote:

> I believe this used to work fine in past.

Could you give a release of Emacs in which this works?

I tried 21.4, 22.1, 22.2, 22.3, 23.1, and 23.2; and it didn't seem to
work in any of them.

Message #13 received at 7351 <at> debbugs.gnu.org (full text, mbox):

From: Paul Pogonyshev <pogonyshev <at> gmx.net>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 7351 <at> debbugs.gnu.org
Subject: Re: bug#7351: 24.0.50;
	next-error no longer takes into account buffer modifications
Date: Thu, 11 Nov 2010 21:31:56 +0200

Glenn Morris wrote:
> Paul Pogonyshev wrote:
> 
> > I believe this used to work fine in past.
> 
> Could you give a release of Emacs in which this works?
> 
> I tried 21.4, 22.1, 22.2, 22.3, 23.1, and 23.2; and it didn't seem to
> work in any of them.

No.  I seem to recollect that at some point (certainly before 24.x
development, maybe even before 23) I could fix a compilation error in
a C file by adding/removing lines, and subsequent errors would still
be found correctly, without any line offset.  Maybe it depends on
actual error source, i.e. gcc vs. grep?  Then again, maybe I invented
this whole story and my memory is failing...

In the latter case, can this be requalified as a feature request?

Paul

Message #16 received at 7351 <at> debbugs.gnu.org (full text, mbox):

From: Jan Djärv <jan.h.d <at> swipnet.se>
To: Paul Pogonyshev <pogonyshev <at> gmx.net>
Cc: Glenn Morris <rgm <at> gnu.org>, 7351 <at> debbugs.gnu.org
Subject: Re: bug#7351: 24.0.50; next-error no longer takes into account buffer
	modifications
Date: Thu, 11 Nov 2010 23:12:00 +0100

FWIW, I remember this feature also from 5-10 years ago.  But I hadn't noticed 
that it was gone now.

	Jan D.


Paul Pogonyshev skrev 2010-11-11 20.31:
> Glenn Morris wrote:
>> Paul Pogonyshev wrote:
>>
>>> I believe this used to work fine in past.
>>
>> Could you give a release of Emacs in which this works?
>>
>> I tried 21.4, 22.1, 22.2, 22.3, 23.1, and 23.2; and it didn't seem to
>> work in any of them.
>
> No.  I seem to recollect that at some point (certainly before 24.x
> development, maybe even before 23) I could fix a compilation error in
> a C file by adding/removing lines, and subsequent errors would still
> be found correctly, without any line offset.  Maybe it depends on
> actual error source, i.e. gcc vs. grep?  Then again, maybe I invented
> this whole story and my memory is failing...
>
> In the latter case, can this be requalified as a feature request?
>
> Paul
>
>

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