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bug#15760: 24.3; move-to-window-line goes to wrong line

From: John Hagerman
Subject: bug#15760: 24.3; move-to-window-line goes to wrong line
Date: Wed, 30 Oct 2013 18:22:42 +0000

Using X Windows, I start 'emacs -Q' and get a window of height "30".  I
need a buffer with more lines than window height, so I enter 35 lines
into an empty buffer.  At that point the last line of the buffer is
somewhere in the middle of the window.  Since 'point' is at the end of
the buffer, doing (move-to-window-line -1) does not move point, as
expected.  Then, since 'point' is at the end of the buffer, doing ESC -
^L adjusts the display so the last line of the buffer is on the last
line of the window.  Now doing (move-to-window-line -1) _does_ move
point, to the previous line.  I believe this is incorrect behavior.
Then, since 'point' has moved, doing ESC - ^L puts the second-to-last
line of the buffer on the last line of the window.  And now doing
(move-to-window-line -1) does not move point, as expected.

Dribble file (unprintable chars edited to, eg, "^X"):

Thanks ~ John

In GNU Emacs 24.3.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.10.4)
 of 2013-05-03 on depbldrh55
Windowing system distributor `The X.Org Foundation', version 11.0.70101000
System Description:     Red Hat Enterprise Linux Client release 5.7 (Tikanga)

Configured using:
 `configure '--prefix=/depot/emacs-24.3' '--with-gif=no'

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<escape> x r e p o r t - e m <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

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