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Re: Unbalanced change hooks (part 2)

From: Stefan Monnier
Subject: Re: Unbalanced change hooks (part 2)
Date: Sun, 31 Jul 2016 14:55:32 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

>     These hook variables let you arrange to take notice of ALL changes
>     in ALL buffers.  [My emphasis]
> Your interpretation of that seems to be that each buffer change will
> call _at least_ one of before-... and after-..., but not necessarily
> both.  That doesn't seem sensible to me.

I fully agree that if you only use before-change-functions (or only use
after-change-functions), your hook function should see *all* changes.

This is an important property and if there are places where this is not
the case, we should fix them.

> No.  A program (such as CC Mode) reacts to a _change_, not merely to
> what a buffer looks like after a change.

But here we have a problem: I don't think that
before/after-change-functions should be always be properly paired, which
IIUC is a property that CC-mode relies on.


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