GNU bug report logs - #25111
How modification-hooks let-bind inhibit-modification-hooks?

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Message #61 received at 25111 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> gmail.com
To: Alan Mackenzie <acm <at> muc.de>
Cc: 25111 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>,
 Noam Postavsky <npostavs <at> gmail.com>, Phillip Lord <phillip.lord <at> russet.org.uk>
Subject: Re: bug#25111: (Inaccurate documentation of
 inhibit-modification-hooks)
Date: Mon, 03 Jun 2019 15:26:38 -0400

Alan Mackenzie <acm <at> muc.de> writes:

> Hello, Eli.
>
> To recap, the problem we were talking about was the modification-hooks
> overlay property, whose value is a function which gets called before and
> after modification of the text under an overlay.
>
> When such a function gets called, inhibit-modification-hooks is left at
> nil.  When the other four similar overlay/text-property "change
> functions" get called, inhibit-modification-hooks gets bound to t.

Minor correction: it's the modification-hooks text property which have
inhibit-modification-hooks left at nil, when the overlay property
modification-hooks get called inhibit-modification-hooks is bound to t,
just like in the after/before-change-functions case.

> This is difficult to document coherently.

And confusing, as evidenced by the fact that we both got confused about
it in this very thread :)

> My proposal of last week was to fix the code, also to bin
> inhibit-modification-hooks to t for the modification-hooks overlay
> property, even though this would be an incompatibility in Lisp.

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