GNU bug report logs - #23081
emacs-auctex: fill-paragraph always sets the modified flag

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

From: Jaakov <j_k_v <at> ro.ru>
To: bug-auctex <at> gnu.org
Subject: emacs-auctex: fill-paragraph always sets the modified flag
Date: Mon, 21 Mar 2016 16:34:43 +0100

Dear maintainer:

Here is the bug:

1) Create a tex file with some long multi-line text, e.g.,

% This buffer is for notes you don't want to save, and for
% Lisp evaluation.  If you want to create a file, visit that file with
% C-x C-f, then enter the text in that file's own buffer.

2) Open this file in Emacs.

3) Put the cursor into the text and press Alt-Q to adjust it to your 
column width. If there are less than two lines, add more text and press 
Alt-Q; repeat until you finally get at least two lines after Alt-Q.

4) a) Save the file.
   b) Observe that the buffer is indicated as stored.

5) a) Press Alt-Q again.
   b) Observe that the buffer contents did not change but the buffer is 
indicated as modified by the stars in the left lower corner.

This is contrary to the modified flag behavior as stated in
https://www.gnu.org/software/emacs/manual/html_node/elisp/Buffer-Modification.html

Some guy from suse claims that this bug is resolved upstream:
https://bugzilla.suse.com/show_bug.cgi?id=971814
Is it really the case?

If no, please repair.

Thanks in advance,

Jaakov.

Message #8 received at 23081 <at> debbugs.gnu.org (full text, mbox):

From: David Kastrup <dak <at> gnu.org>
To: Jaakov <j_k_v <at> ro.ru>
Cc: 23081 <at> debbugs.gnu.org
Subject: Re: bug#23081: emacs-auctex: fill-paragraph always sets the modified
 flag
Date: Mon, 21 Mar 2016 22:32:35 +0100

Jaakov <j_k_v <at> ro.ru> writes:

> Dear maintainer:
>
> Here is the bug:
>
> 1) Create a tex file with some long multi-line text, e.g.,
>
> % This buffer is for notes you don't want to save, and for
> % Lisp evaluation.  If you want to create a file, visit that file with
> % C-x C-f, then enter the text in that file's own buffer.
>
> 2) Open this file in Emacs.
>
> 3) Put the cursor into the text and press Alt-Q to adjust it to your
> column width. If there are less than two lines, add more text and
> press Alt-Q; repeat until you finally get at least two lines after
> Alt-Q.
>
> 4) a) Save the file.
>    b) Observe that the buffer is indicated as stored.
>
> 5) a) Press Alt-Q again.
>    b) Observe that the buffer contents did not change but the buffer
> is indicated as modified by the stars in the left lower corner.
>
> This is contrary to the modified flag behavior as stated in
> https://www.gnu.org/software/emacs/manual/html_node/elisp/Buffer-Modification.html

This is the same in Emacs' *scratch* buffer as of

GNU Emacs 25.1.50.2 (i686-pc-linux-gnu, GTK+ Version 3.18.7) of 2016-02-24

so it's not particular to AUCTeX.

-- 
David Kastrup

Message #11 received at 23081 <at> debbugs.gnu.org (full text, mbox):

From: Jaakov <j_k_v <at> ro.ru>
To: David Kastrup <dak <at> gnu.org>
Cc: 23081 <at> debbugs.gnu.org
Subject: Re: bug#23081: emacs-auctex: fill-paragraph always sets the modified
 flag
Date: Mon, 21 Mar 2016 22:39:17 +0100

On 21.03.2016 22:32, David Kastrup wrote:
> Jaakov <j_k_v <at> ro.ru> writes:
>
>> Dear maintainer:
>>
>> Here is the bug:
>>
>> 1) Create a tex file with some long multi-line text, e.g.,
>>
>> % This buffer is for notes you don't want to save, and for
>> % Lisp evaluation.  If you want to create a file, visit that file with
>> % C-x C-f, then enter the text in that file's own buffer.
>>
>> 2) Open this file in Emacs.
>>
>> 3) Put the cursor into the text and press Alt-Q to adjust it to your
>> column width. If there are less than two lines, add more text and
>> press Alt-Q; repeat until you finally get at least two lines after
>> Alt-Q.
>>
>> 4) a) Save the file.
>>     b) Observe that the buffer is indicated as stored.
>>
>> 5) a) Press Alt-Q again.
>>     b) Observe that the buffer contents did not change but the buffer
>> is indicated as modified by the stars in the left lower corner.
>>
>> This is contrary to the modified flag behavior as stated in
>> https://www.gnu.org/software/emacs/manual/html_node/elisp/Buffer-Modification.html
>
> This is the same in Emacs' *scratch* buffer as of
>
> GNU Emacs 25.1.50.2 (i686-pc-linux-gnu, GTK+ Version 3.18.7) of 2016-02-24
>
> so it's not particular to AUCTeX.
>
You are right! Thank you! I was misled by the openSuSe guy.

Message #16 received at 23081-done <at> debbugs.gnu.org (full text, mbox):

From: Jaakov <j_k_v <at> ro.ru>
Cc: control <at> debbugs.gnu.org, 23081-done <at> debbugs.gnu.org
Subject: Re: bug#23081: emacs-auctex: fill-paragraph always sets the modified
 flag
Date: Mon, 21 Mar 2016 22:40:00 +0100

# Not related to auctex.
close 23081
thanks

Message #19 received at 23081 <at> debbugs.gnu.org (full text, mbox):

From: Jaakov <j_k_v <at> ro.ru>
To: David Kastrup <dak <at> gnu.org>, 23081 <at> debbugs.gnu.org
Subject: Re: bug#23081: emacs-auctex: fill-paragraph always sets the modified
 flag
Date: Tue, 22 Mar 2016 13:41:08 +0100

By the way, is auctex reimplementing fill-paragraph in some way? If so, 
auctex could do better in latex-mode than emacs itself on text mode...

On 21.03.2016 22:32, David Kastrup wrote:
> Jaakov <j_k_v <at> ro.ru> writes:
>
>> Dear maintainer:
>>
>> Here is the bug:
>>
>> 1) Create a tex file with some long multi-line text, e.g.,
>>
>> % This buffer is for notes you don't want to save, and for
>> % Lisp evaluation.  If you want to create a file, visit that file with
>> % C-x C-f, then enter the text in that file's own buffer.
>>
>> 2) Open this file in Emacs.
>>
>> 3) Put the cursor into the text and press Alt-Q to adjust it to your
>> column width. If there are less than two lines, add more text and
>> press Alt-Q; repeat until you finally get at least two lines after
>> Alt-Q.
>>
>> 4) a) Save the file.
>>     b) Observe that the buffer is indicated as stored.
>>
>> 5) a) Press Alt-Q again.
>>     b) Observe that the buffer contents did not change but the buffer
>> is indicated as modified by the stars in the left lower corner.
>>
>> This is contrary to the modified flag behavior as stated in
>> https://www.gnu.org/software/emacs/manual/html_node/elisp/Buffer-Modification.html
>
> This is the same in Emacs' *scratch* buffer as of
>
> GNU Emacs 25.1.50.2 (i686-pc-linux-gnu, GTK+ Version 3.18.7) of 2016-02-24
>
> so it's not particular to AUCTeX.
>

Message #22 received at 23081 <at> debbugs.gnu.org (full text, mbox):

From: David Kastrup <dak <at> gnu.org>
To: Jaakov <j_k_v <at> ro.ru>
Cc: 23081 <at> debbugs.gnu.org
Subject: Re: bug#23081: emacs-auctex: fill-paragraph always sets the modified
 flag
Date: Tue, 22 Mar 2016 14:25:16 +0100

Jaakov <j_k_v <at> ro.ru> writes:

> By the way, is auctex reimplementing fill-paragraph in some way? If
> so, auctex could do better in latex-mode than emacs itself on text
> mode...

AUCTeX contains the following pertinent comment:

;; Following lines are copied from `fill.el' (CVS Emacs, March 2005).
;;   The `fill-space' property carries the string with which a newline should be
;;   replaced when unbreaking a line (in fill-delete-newlines).  It is added to
;;   newline characters by fill-newline when the default behavior of
;;   fill-delete-newlines is not what we want.

I seem to remember that Emacs does a better job currently than AUCTeX
with regard to keeping text properties alive.  Some synching may be in
order but it would appear that it would be saner to change this for
filling in Emacs itself before starting to copy code into AUCTeX (or
calling the Emacs code if it's versatile enough) if that's your goal.

-- 
David Kastrup

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