From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: martin rudalics <rudalics@gmx.at>
Cc: 12170@debbugs.gnu.org, Bill Brodie <wbrodie@panix.com>
Subject: bug#12170: save-excursion fails boundary case with recenter
Date: Fri, 10 Aug 2012 12:18:08 -0400 [thread overview]
Message-ID: <jwvhasaendr.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <50251EED.3010804@gmx.at> (martin rudalics's message of "Fri, 10 Aug 2012 16:47:09 +0200")
> But I don't have the slightest idea how calling
> (set-window-start (selected-window) ,start t)
> would remedy this. Eli will soon teach us a lesson here.
The redisplay tries to make sure (window-)point is visible, which can
either be done by changing (window-)point or by changing window-start.
The first happens when you use a scrolling operation (which sets
window-start), the other happens in response to normal navigation in
the buffer.
Knowing which to do when is not obvious, but IIUC if window-start has
not been changed, then the redisplay assumes that it is free to change
(window-)point, whereas otherwise it will assume that it should not
change (window-)point but can instead change window-start.
Stefan
next prev parent reply other threads:[~2012-08-10 16:18 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-10 1:23 bug#12170: save-excursion fails boundary case with recenter Bill Brodie
2012-08-10 9:34 ` martin rudalics
2012-08-10 9:50 ` Bastien
2012-08-10 13:03 ` martin rudalics
2012-08-10 13:40 ` Bill Brodie
2012-08-10 14:47 ` martin rudalics
2012-08-10 16:18 ` Stefan Monnier [this message]
2012-08-10 16:47 ` martin rudalics
2012-08-10 17:07 ` Stefan Monnier
2012-08-10 19:01 ` Eli Zaretskii
2012-08-11 9:32 ` martin rudalics
2012-08-11 11:11 ` Eli Zaretskii
2012-08-11 14:22 ` martin rudalics
2012-08-11 15:10 ` Eli Zaretskii
2012-08-11 16:05 ` martin rudalics
2012-08-11 16:31 ` Eli Zaretskii
2012-08-11 16:49 ` Eli Zaretskii
2012-08-12 10:31 ` martin rudalics
2012-08-11 16:27 ` Bill Brodie
2012-08-10 15:04 ` Stefan Monnier
2012-08-10 15:46 ` Bill Brodie
2012-08-10 16:46 ` martin rudalics
2012-08-10 16:46 ` martin rudalics
2012-08-10 18:58 ` Eli Zaretskii
2012-08-11 9:31 ` martin rudalics
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