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

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: <klaus.berndl@HIDDEN>
Subject: Re: bug#3038: 23.0.91; after-change-functions and indirect buffers
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 Content preview:  <klaus.berndl@HIDDEN> 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.) 
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<klaus.berndl@HIDDEN> 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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From: Stefan Monnier <monnier@HIDDEN>
To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#3038: 23.0.91; after-change-functions and indirect buffers
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>> 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.

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To: 3038 <at> debbugs.gnu.org
Subject: Re: bug#3038: 23.0.91; after-change-functions and indirect buffers
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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.

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Subject: 23.0.91; after-change-functions and indirect buffers
From: Lennart Borgman <lennart.borgman@HIDDEN>
To: emacs-pretest-bug@HIDDEN, "Eric M. Ludlam" <eric@HIDDEN>
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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