From: martin rudalics <rudalics@gmx.at>
To: Bill Brodie <wbrodie@panix.com>
Cc: 12170@debbugs.gnu.org
Subject: bug#12170: save-excursion fails boundary case with recenter
Date: Fri, 10 Aug 2012 11:34:11 +0200 [thread overview]
Message-ID: <5024D593.7080305@gmx.at> (raw)
In-Reply-To: <000001cd7696$b0e93d60$12bbb820$@com>
> (defun f (n) (save-excursion (forward-line (- n)) (recenter
> 0)))
>
>
>
> Let H be the window height in lines, and suppose that point is positioned at
> the beginning of line L > H.
>
>
>
> Despite 'save-excursion', (f K) moves point if K = H. It leaves point
> unchanged for any other value of K, 0 <= K < L.
I'm not sure whether I clearly understand your scenario. Suppose with
emacs -Q I evaluate
(progn
(defun f (n)
(save-excursion (forward-line (- n)) (recenter 0)))
(let ((buffer (switch-to-buffer "foo"))
(height (window-height (get-buffer-window "foo"))))
(insert-char 10 (* height 2))
(let ((pt (point)))
(f height)
(message "old %s new %s" pt (point)))))
Then the values printed by the message are equal. Please elaborate.
Thanks, martin
next prev parent reply other threads:[~2012-08-10 9:34 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 [this message]
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
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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