From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Alan Mackenzie <acm@muc.de>
Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
Subject: Re: Edebug corrupting point in buffers.
Date: Wed, 02 Nov 2022 09:12:57 -0400 [thread overview]
Message-ID: <jwvfsf1wlio.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <Y2JJOx2idfuDAP5v@ACM> (Alan Mackenzie's message of "Wed, 2 Nov 2022 10:40:59 +0000")
>> Really? My reading of the code:
>
>> /* As documented in Fcurrent_window_configuration, don't
>> restore the location of point in the buffer which was
>> current when the window configuration was recorded. */
>> if (!EQ (p->buffer, new_current_buffer)
>> && XBUFFER (p->buffer) == current_buffer)
>> Fgoto_char (w->pointm);
>
>> is that it's done only for the current buffer and only if it's different
>> from the "to be current buffer".
>
>> Am I missing something?
>
> Hmm. I spent a great deal of yesterday asserting false things, then
> apologising for them. The above was the last such false thing, for which
> I also apologise.
If we had to apologize every time we misread/misunderstood code, we'd
never get anywhere :-)
> There's clearly been a lot of confusion about window/buffer point over
> the decades which shows in the number of places such changes in buffer
> point occur, and the bugs which have sometimes resulted, like the one
> you cite above.
This is arguably one of the most subtle/delicate/complex aspect of
ELisp's semantics, indeed.
Stefan
next prev parent reply other threads:[~2022-11-02 13:12 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-31 11:43 Edebug corrupting point in buffers; we need buffer-point and set-buffer-point, perhaps Alan Mackenzie
2022-10-31 13:16 ` Eli Zaretskii
2022-10-31 14:32 ` Alan Mackenzie
2022-10-31 14:50 ` Eli Zaretskii
2022-10-31 15:46 ` Alan Mackenzie
2022-10-31 17:33 ` Stefan Monnier
2022-10-31 17:55 ` Eli Zaretskii
2022-10-31 20:46 ` Alan Mackenzie
2022-11-01 6:21 ` Eli Zaretskii
2022-10-31 17:19 ` Stefan Monnier
2022-10-31 18:09 ` Eli Zaretskii
2022-10-31 20:35 ` Stefan Monnier
2022-10-31 17:21 ` Stefan Monnier
2022-10-31 18:10 ` Eli Zaretskii
2022-10-31 23:14 ` Stefan Monnier
2022-11-01 7:06 ` Eli Zaretskii
2022-10-31 21:25 ` Alan Mackenzie
2022-11-01 6:45 ` Eli Zaretskii
2022-11-01 11:41 ` Edebug corrupting point in buffers Alan Mackenzie
2022-11-01 11:53 ` Eli Zaretskii
2022-11-01 13:42 ` Alan Mackenzie
2022-11-01 14:42 ` Eli Zaretskii
2022-11-01 17:06 ` Alan Mackenzie
2022-11-01 17:12 ` Eli Zaretskii
2022-11-01 17:24 ` Alan Mackenzie
2022-11-01 17:57 ` Eli Zaretskii
2022-11-01 19:02 ` Alan Mackenzie
2022-11-01 19:47 ` Stefan Monnier
2022-11-01 20:53 ` Alan Mackenzie
2022-11-01 21:51 ` Stefan Monnier
2022-11-02 10:40 ` Alan Mackenzie
2022-11-02 13:12 ` Stefan Monnier [this message]
2022-11-02 13:28 ` Eli Zaretskii
2022-11-02 3:28 ` Eli Zaretskii
2022-11-02 12:53 ` Stefan Monnier
2022-11-02 17:40 ` Juri Linkov
2022-11-02 18:26 ` Eli Zaretskii
2022-11-02 18:36 ` Juri Linkov
2022-11-02 18:52 ` Eli Zaretskii
2022-11-03 17:25 ` Juri Linkov
2022-11-03 18:06 ` Eli Zaretskii
2022-11-03 18:31 ` Juri Linkov
2022-11-02 11:34 ` Alan Mackenzie
2022-11-02 14:00 ` Eli Zaretskii
2022-11-02 16:18 ` Alan Mackenzie
2022-11-02 16:57 ` Eli Zaretskii
2022-11-03 11:32 ` Alan Mackenzie
2022-11-03 13:29 ` Eli Zaretskii
2022-11-03 18:07 ` Alan Mackenzie
2022-11-03 18:15 ` Eli Zaretskii
2022-11-03 20:25 ` Alan Mackenzie
2022-11-05 11:24 ` Eli Zaretskii
2022-11-05 16:50 ` Alan Mackenzie
2022-11-06 8:10 ` Eli Zaretskii
2022-11-06 14:40 ` Alan Mackenzie
2022-11-03 19:29 ` Stefan Monnier
2022-11-03 19:36 ` Eli Zaretskii
2022-11-03 20:39 ` Stefan Monnier
2022-11-04 6:34 ` Eli Zaretskii
2022-11-04 6:37 ` Eli Zaretskii
2022-11-03 19:57 ` Alan Mackenzie
2022-11-03 20:35 ` Stefan Monnier
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