From: "Óscar Fuentes" <ofv@wanadoo.es>
To: help-gnu-emacs@gnu.org
Subject: Re: Reverting but keeping undo
Date: Thu, 30 May 2013 21:19:41 +0200 [thread overview]
Message-ID: <877giguvg2.fsf@wanadoo.es> (raw)
In-Reply-To: 878v2w8g3t.fsf@web.de
Michael Heerdegen <michael_heerdegen@web.de> writes:
>> FWIW, I just installed a patch in Emacs's trunk which makes that
>> revert-buffer doesn't discard undo history any more.
>
> I wonder how that works. Generally, the undo history belongs to a
> buffer content different from the content after reverting. Does your
> patch prevent surprises like "undoing" changes that were never made to
> the newly read-in buffer content?
I have not tried the change introduced by Stefan, so my comments below
are just hypothetical.
Keeping undo history makes a lot of sense on this scenario:
1 Visit file
2 Edit
3 Save
3 Edit
4 Revert
It is obvious that the undo history created by step 3 is unusable, but
the part created by step 2 is useful. Until now, Emacs discardeded all
undo history.
What happens when the file is modified outside of Emacs? You migth end
with elements in the undo history which are out of sync with the file
contents. I don't know how Emacs behaves on those situations.
next prev parent reply other threads:[~2013-05-30 19:19 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-15 10:38 Reverting but keeping undo Óscar Fuentes
2013-05-16 5:29 ` W. Greenhouse
2013-05-16 15:10 ` Óscar Fuentes
2013-05-29 1:52 ` Stefan Monnier
2013-05-29 3:09 ` Drew Adams
2013-05-29 3:27 ` Dmitry Gutov
2013-05-29 5:13 ` Drew Adams
2013-05-29 12:26 ` Dmitry Gutov
2013-05-29 13:55 ` Drew Adams
2013-05-29 15:21 ` Dmitry Gutov
2013-05-29 16:33 ` Drew Adams
2013-05-29 17:51 ` Dmitry Gutov
[not found] ` <mailman.605.1369845207.22516.help-gnu-emacs@gnu.org>
2013-05-29 18:42 ` Dan Espen
2013-05-29 13:48 ` Stefan Monnier
[not found] ` <mailman.562.1369804408.22516.help-gnu-emacs@gnu.org>
2013-05-29 13:25 ` Dan Espen
2013-05-29 16:26 ` Drew Adams
2013-05-30 18:48 ` Michael Heerdegen
2013-05-30 18:41 ` Michael Heerdegen
2013-05-30 19:19 ` Óscar Fuentes [this message]
2013-05-30 21:26 ` Stefan Monnier
2013-05-30 22:05 ` Michael Heerdegen
[not found] ` <mailman.728.1369951538.22516.help-gnu-emacs@gnu.org>
2013-05-30 23:59 ` Dan Espen
2013-05-31 0:58 ` Stefan Monnier
[not found] ` <mailman.738.1369961954.22516.help-gnu-emacs@gnu.org>
2013-05-31 1:21 ` Dan Espen
2013-05-31 2:28 ` Drew Adams
2013-05-31 16:05 ` Michael Heerdegen
2013-05-31 18:29 ` Óscar Fuentes
[not found] ` <mailman.767.1370016367.22516.help-gnu-emacs@gnu.org>
2013-05-31 17:22 ` Dan Espen
2013-05-31 18:08 ` Barry Margolin
[not found] ` <mailman.699.1369939338.22516.help-gnu-emacs@gnu.org>
2013-05-30 18:45 ` Barry Margolin
-- strict thread matches above, loose matches on Subject: below --
2013-05-31 16:49 Barry OReilly
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