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From: Eli Zaretskii <eliz@gnu.org>
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Date: Tue, 19 Jul 2016 20:20:48 +0300
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In-reply-to: <87a8hdmuce.fsf@linaro.org> (message from Alex
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To: Alex =?UTF-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>
Cc: 23917@debbugs.gnu.org, rpluim@gmail.com, jwiegley@gmail.com, monnier@iro.umontreal.ca, nljlistbox2@gmail.com

> From: Alex Bennée <alex.bennee@linaro.org>
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 23917@debbugs.gnu.org, rpluim@gmail.com, jwiegley@gmail.com, nljlistbox2@gmail.com
> Date: Tue, 19 Jul 2016 18:05:37 +0100
> 
> > Do we care that using save-match-data in every call to replace-match
> > might mean a performance hit?  If it will, then this will again punish
> > most of the users for the benefit of those few who (1) have
> > buffer-modification hooks, and (2) those hooks call save-match-data.
> 
> I care unless there is an easy way to identify which buffer modification
> hooks are responsible so I can take steps as a user to mitigate the
> problems.

Any hook in before-change-functions or after-change-functions that
calls save-match-data.

If we care about the performance hit, we need to come up with a
different solution for this problem (or measure the performance hit
and convince ourselves it is not a big deal).