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bug#17585: 24.4.50; vertical-motion erroneously adds points

From: Keith David Bershatsky
Subject: bug#17585: 24.4.50; vertical-motion erroneously adds points
Date: Sun, 25 May 2014 00:23:20 -0700
User-agent: / () / () APEL/10.8 Emacs/24.4.50 (x86_64-apple-darwin10.8.0) MULE/6.0 (HANACHIRUSATO)

The following test function demonstrates how vertical-motion erroneously adds 
points when dealing with long lines without spaces that go beyond the 

    (defun test ()
      (switch-to-buffer (get-buffer-create "foo.txt"))
      (linum-mode t)
      (visual-line-mode t)
      (dotimes (i (* (window-width) 4))
        (insert ";"))
     (dotimes (i 10)
        (insert "\n"))
      (goto-char (point-min))
      (vertical-motion 1)
      (message "Second Row + 2 points:  %s" (current-column))
      (vertical-motion 1)
      (message "Third Row + 4 points:  %s" (current-column)))

Additional incorrect behavior can be seen by moving the cursor to the beginning 
of the buffer after running the above test function and evaluating 
`(vertical-motion 1`).  Instead of moving to line number two, the cursor will 
move to column number 2.  I have written a workaround to compensate for the 
problem -- if point is on the first wrapped line, then ...

    (vertical-motion 1)
    (when (= (current-column) 2 )
      (move-to-column (+ (current-column) (- window-width 2))))

This bug affects the popular functions that rely upon the behavior of 
vertical-motion -- e.g., scrolling with the mouse; and using the arrow keys to 
navigate the buffer.

If the wrapped line is at the top of the buffer, and there are many such 
wrapped lines that don't break nicely at the far right edge (e.g., no space and 
no tab), then the mouse scroll becomes inoperable unless one uses the scroll 




In GNU Emacs (x86_64-apple-darwin10.8.0, NS apple-appkit-1038.36)
 of 2014-04-28 on MP.local
Repository revision: 117030 address@hidden
Windowing system distributor `Apple', version 10.3.1038
Configured using:
 `configure --with-ns'

Configured features:

Important settings:
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  lawlist-scroll-bar-mode: t
  lawlist-delete-selection-mode: t
  desktop-save-mode: t
  tabbar-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  transient-mark-mode: t

Recent input:
<escape> x e m a c s - r e p o r t - b u g <return> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> r e p o r t - b u g - e m a c s <return> 
<backspace> <return> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> e m a c s - b u g <return> 
<backspace> <backspace> <backspace> r e p o r t <return> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> r e p o r t - <return> b u 
g <return>

Recent messages:
Loading /Users/HOME/.0.data/.0.emacs/init.el (source)...
Loading /Users/HOME/.0.data/.0.emacs/.multiple_cursors...done
Loading /Users/HOME/.0.data/.0.emacs/init.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Wrote /Users/HOME/.0.data/.0.emacs/.lock
Turned ON highlighting current column when Emacs is idle.
*beep* [5 times]

Load-path shadows:
/Users/HOME/.0.data/.0.emacs/.0.flim/md4 hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/hex-util hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/sasl hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/sasl-ntlm hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/sasl-digest hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/sasl-cram hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/ntlm hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/hmac-md5 hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/hmac-def hides 
/Users/HOME/.0.data/.0.emacs/.0.wl/rfc2368 hides 
/Users/HOME/.0.data/.0.emacs/.0.wl/utf7 hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/smime hides 
/Users/HOME/.emacs.d/elpa/tabulated-list-20120406.1351/tabulated-list hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-pgp5 hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-pgp hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-parse hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-gpg hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-def hides 

(shadow disp-table wl-mime mime-edit pgg-parse pccl pccl-20 signature
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text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
cocoa ns multi-tty emacs)

Memory information:
((conses 16 718578 45882)
 (symbols 48 54623 0)
 (miscs 40 83 241)
 (strings 32 112318 16394)
 (string-bytes 1 3740329)
 (vectors 16 40884)
 (vector-slots 8 721743 31900)
 (floats 8 957 235)
 (intervals 56 470 88)
 (buffers 960 13))

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