GNU bug report logs - #30823
25.3; modification-hooks of overlays are not run in some cases

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Message #28 received at 30823 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: victorhge <at> gmail.com, npostavs <at> gmail.com, 30823 <at> debbugs.gnu.org
Subject: Re: bug#30823: 25.3;
 modification-hooks of overlays are not run in some cases
Date: Sun, 19 Aug 2018 17:46:55 +0300

> From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
> Cc: Noam Postavsky <npostavs <at> gmail.com>, victorhge <at> gmail.com,
>         30823 <at> debbugs.gnu.org
> Date: Sat, 18 Aug 2018 23:48:02 -0400
> 
> > Can we turn the table and ask whether it makes sense to delete an
> > overlay from the modification hooks of that same overlay?
> 
> Yes, it very much does make sense: e.g. you want to keep track of
> a "region unmodified" status, so you place an overlay over that region
> with a modification hook that sets a variable to nil to indicate that
> the region was modified, and once that is done there's no point in
> keeping the overlay any more so you can delete it immediately from that
> modification-hook.

I see that I tried too hard to be gentle, and that must have made my
question unclear, because that's not what I was asking.  I was asking
whether we want to support code which does this, because maybe it is
unreasonable to delete an overlay from within its modification hook.

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