GNU bug report logs - #12170
save-excursion fails boundary case with recenter

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "Bill Brodie" <wbrodie <at> panix.com>
To: <bug-gnu-emacs <at> gnu.org>
Subject: save-excursion fails boundary case with recenter
Date: Thu, 9 Aug 2012 21:23:04 -0400

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Running GNU Emacs 24.1.1 (i386-mingw-nt6.1.7601) of 2012-06-10 on MARVIN
under Windows 7.

 

Define:

 

                (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.

 

 

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