GNU bug report logs - #1501
Emacs 22 loses undo buffer

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Message #66 received at 1501 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: Emerick Rogul <emerick <at> gmail.com>, 1501 <at> debbugs.gnu.org,
 Chong Yidong <cyd <at> stupidchicken.com>
Subject: Re: bug#1501: Emacs 22 loses undo buffer
Date: Tue, 20 Aug 2019 14:45:08 -0400

Stefan Kangas <stefan <at> marxist.se> writes:

> increase in the memory usage of each undo record, especially when
> using font-lock-mode.  I'm not sure that is a serious problem, since
> memory is only getting cheaper, but it might be worth investigating.
> On the other hand, we could just decide that this is not worth the
> effort and close this as wontfix.

Hmm, it sounds like the problem might just be due to saving text
properties in the undo records?  If so, maybe a simple fix is to just
drop them (or drop only face and font-lock-face properties).

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