GNU bug report logs - #3038
23.0.91; after-change-functions and indirect buffers

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Lennart Borgman <lennart.borgman <at> gmail.com>
To: emacs-pretest-bug <at> gnu.org, "Eric M. Ludlam" <eric <at> siege-engine.com>
Subject: 23.0.91; after-change-functions and indirect buffers
Date: Fri, 17 Apr 2009 16:12:54 +0200

I got this from Eric Ludlam. There seem to be a problem with
after-change-functions and indirect buffers. To me this looks like a
bug:

"Yes, I use after-change-functions.  ...

If you edit the base buffer, these functions don't get run in the
indirect buffer, but if you edit the indirect buffer, they do get run,
but not in the base buffer."


In GNU Emacs 23.0.91.1 (i386-mingw-nt5.1.2600)
 of 2009-02-26

Message #10 received at 3038 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: 3038 <at> debbugs.gnu.org
Subject: Re: bug#3038: 23.0.91; after-change-functions and indirect buffers
Date: Mon, 18 Feb 2013 21:08:15 -0500

Lennart Borgman wrote:

> I got this from Eric Ludlam. There seem to be a problem with
> after-change-functions and indirect buffers. To me this looks like a
> bug:
>
> "Yes, I use after-change-functions.  ...
>
> If you edit the base buffer, these functions don't get run in the
> indirect buffer, but if you edit the indirect buffer, they do get run,
> but not in the base buffer."

It doesn't look like a bug to me. You'll have to explicitly check for
indirect buffers if that matter to you.

Message #15 received at 3038 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 3038 <at> debbugs.gnu.org
Subject: Re: bug#3038: 23.0.91; after-change-functions and indirect buffers
Date: Mon, 18 Feb 2013 22:06:30 -0500

>> I got this from Eric Ludlam. There seem to be a problem with
>> after-change-functions and indirect buffers. To me this looks like a
>> bug:
>> "Yes, I use after-change-functions.  ...
>> If you edit the base buffer, these functions don't get run in the
>> indirect buffer, but if you edit the indirect buffer, they do get run,
>> but not in the base buffer."
> It doesn't look like a bug to me.  You'll have to explicitly check for
> indirect buffers if that matter to you.

While it "works as designed" I can imagine it breaks lots of code which
assumes that an after-change-function lets you be kept informed of "all"
buffer modifications.
IOW, even if it's not a bug in after-change-functions, it's then a bug
in syntax-ppss, font-lock, and probably many other packages using
after-change-function.


        Stefan


PS: FWIW, I'm not sure indirect-buffers are a good idea.

Message #20 received at 3038 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: <klaus.berndl <at> capgemini-sdm.com>
Cc: 3018 <at> debbugs.gnu.org, 3038 <at> debbugs.gnu.org
Subject: Re: bug#3038: 23.0.91; after-change-functions and indirect buffers
Date: Sun, 01 May 2022 12:00:10 +0200

<klaus.berndl <at> capgemini-sdm.com> writes:

> AFAICS the new hook `clone-indirect-buffer-hook' of Emacs 23 is not
> used by the command `make-indirect-buffer-hook' or is it? If not: why
> not?

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

Skimming this bug report, it seems like it was agreed that this works as
designed.  There was then some discussion about after-change-functions,
but this bug report doesn't seem actionable, so I'm closing it.  If
there is something that should be done in this area, opening a new bug
report and restating the issue would be the way forward.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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