GNU bug report logs - #25599
26.0.50; "Marker does not point anywhere" error signaled by primitive-undo near an overlay with an auto-removal insert-in-front-hooks value

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From: npostavs <at> users.sourceforge.net
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: 25599 <at> debbugs.gnu.org, Andreas Schwab <schwab <at> linux-m68k.org>, nitish chandra <nitishchandrachinta <at> gmail.com>
Subject: bug#25599: Why edit markers after insert?
Date: Sun, 11 Jun 2017 14:10:08 -0400

Dmitry Gutov <dgutov <at> yandex.ru> writes:

> On 09.03.2017 21:39, nitish chandra wrote:
>> The problem is being caused by insert invalidating some of the
>> markers. So before adjusting the markers, we can check if the marker
>> is valid or not. Following is a patch that does this.
>
> Thanks, Nitish. The patch works for me.
>
> Could someone else more familiar with undo give a second opinion, please?

Not that I'm very familiar with the undo code, but the patch seems
obviously correct to me.

+               ;; insert might have invalidated some of the
+               ;; markers. We update only the currently valid
+               ;; markers. See bug#25599

I would augment the comment to specifically mention modification hooks
though (missing double spacing too).

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