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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 
window-width:

    (defun test ()
    (interactive)
      (switch-to-buffer (get-buffer-create "foo.txt"))
      (text-mode)
      (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 
bars.

Thanks,

Keith

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

In GNU Emacs 24.4.50.1 (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:
ACL LIBXML2 ZLIB

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:
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/Users/HOME/.0.data/.0.emacs/Emacs_04_28_2014.app/Contents/Resources/lisp/obsolete/pgg-def

Features:
(shadow disp-table wl-mime mime-edit pgg-parse pccl pccl-20 signature
mime-setup mail-mime-setup semi-setup mime-pgp pgg-def mime-play
filename mime-image modb-legacy modb-standard elmo-imap4 emacsbug
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poem-e20 poem-e20_3 eword-decode std11 elmo-date elmo-vars
elmo-version w3m-load mime-w3m w3m browse-url doc-view jka-compr
image-mode w3m-hist w3m-fb bookmark-w3m w3m-ems w3m-ccl ccl
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package esh-var esh-io esh-cmd esh-opt esh-ext esh-proc esh-arg eldoc
esh-groups eshell esh-module esh-mode esh-util dired-x view tramp
tramp-compat tramp-loaddefs trampver server grep epa epg epg-config
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ediff-help ediff-init ediff-util ediff rx ert ewoc debug eieio-base
lawlist-calculator ps-print ps-def lpr flyspell ispell bbdb timezone
find-func dired-aux yasnippet help-mode multiple-cursors
mc-separate-operations rectangular-region-mode mc-mark-more thingatpt
mc-cycle-cursors mc-edit-lines multiple-cursors-core rect saveplace
lawlist-tex-mode pcase compile shell pcomplete comint ansi-color ring
skeleton compare-w desktop frameset lawlist-tabbar lawlist-org
lawlist-calendar edmacro kmacro derived lawlist-toodledo advice
url-http url-auth url-gw url url-proxy url-privacy url-expand
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auth-source eieio byte-opt bytecomp byte-compile cconv eieio-core
password-cache url-vars mailcap json xml noutline outline easy-mmode
gnus-sum gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail
mail-source tls utf7 mel path-util mime-def alist mcharset mcs-20
mcs-e20 pcustom pces pces-e20 pces-20 broken poe pym static apel-ver
product netrc nnoo parse-time gnus-spec gnus-int gnus-range message
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mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums
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cl-loaddefs cl-lib time-date tooltip electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel ns-win tool-bar dnd fontset image
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register page menu-bar rfn-eshadow timer select scroll-bar mouse
jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer nadvice loaddefs button faces cus-face macroexp files
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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