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

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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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In-Reply-To: <6xzjz12gz4.fsf@HIDDEN> (Glenn Morris's message of
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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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From: Glenn Morris <rgm@HIDDEN>
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