move-to-window-line

[山本和彦]

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In GNU Emacs 21.2.1 (i386-unknown-netbsdelf1.5.3., X toolkit, Xaw3d scroll bars)
 of 2002-07-10 on mine.iij.ad.jp
configured using `configure  --without-xim --prefix=/usr/local/emacs21'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Action of move-to-window-line of Emacs 21.2 is different from that of
Emacs 20.7. Mr. Handa said to me this is a bug. So, I'm writing this
report.

Execute the following code to insert an overlay to *scratch*, whose
string is [End of buffer].

        (let ((ovl (make-overlay (point-max) (point-max))))
          (overlay-put ovl 'before-string "[End of buffer]"))

Now, please change the height of an Emacs window corresponding to
*scratch* so that this overlay comes the last visible line of the
window, for example, by resizing with a mouse.

In this situation, on Emacs 20.7, evaluating the code:
        (move-to-window-line -1)
the cursor moves to "*1". But on Emacs 21.2, the cursor moves to "*2".

        --- *scratch* buffer

        *2
        [End of buffer]*1
        --- *scratch* buffer

I think motion of Emacs 20.7 is correct.

Recent input:
RET d d d d d d x i SPC d x C-p C-p C-p C-p i O y i 
p i d x C-p C-p C-p C-p C-p i O y C-p C-p C-p C-p C-p 
C-p C-p C-p C-p C-p SPC n n n SPC n SPC SPC SPC SPC 
i SPC d x C-p C-p C-p C-p i d x i p o RET x i C-p SPC 
RET RET RET RET RET RET RET RET RET RET RET RET RET 
RET RET RET RET ESC x r e p o TAB r TAB b SPC RET

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--Kazu Yamamoto, IIJ