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bug#5117: 23.1.50; Weird display when wrap-prefix contains tabs
From: |
Matthew Dempsky |
Subject: |
bug#5117: 23.1.50; Weird display when wrap-prefix contains tabs |
Date: |
Thu, 3 Dec 2009 14:06:26 -0800 |
Here's the contents of `foo.el':
(require 'cl)
(with-output-to-temp-buffer "bonk"
(with-current-buffer standard-output
(loop for i from 1 to 100 do
(insert (make-string (+ (random 5) 3) ?x) " "))
(visual-line-mode)
(setq wrap-prefix "\t")))
If I run `Emacs -Q foo.el' and then `M-x eval-buffer', it creates a new
buffer "demo", but instead of each continuation line being consistently
indented by 8 spaces, they're each randomly indented between 1 and 8
spaces.
The issue appears to be due to the expansion of tabs being related to
the actual current column rather than the visual current column.
Literal tabs within a wrapped paragraph exhibit similar behavior.
This additionally sometimes confuses `visual-line-mode's line motion
keys.
In GNU Emacs 23.1.50.1 (i386-apple-darwin9.8.0, NS apple-appkit-949.54)
of 2009-12-02 on admins-macbook-pro-2.local
Windowing system distributor `Apple', version 10.3.949
configured using `configure '--with-ns' '--without-x''
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: en_US.UTF-8
value of $XMODIFIERS: nil
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t
Major mode: Emacs-Lisp
Minor modes in effect:
tooltip-mode: t
mouse-wheel-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
global-auto-composition-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t
Recent input:
M-x e v a l - b u f f e r <return> M-` h s
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Load-path shadows:
None found.
Features:
(shadow mail-extr message ecomplete rfc822 mml mml-sec password-cache
mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231 rfc2047 rfc2045
qp ietf-drums mailabbrev nnheader gnus-util netrc time-date mm-util
mail-prsvr gmm-utils wid-edit mailheader canlock sha1 hex-util hashcash
mail-utils emacsbug sendmail regexp-opt tmm electric help-mode view cl
cl-19 tooltip ediff-hook vc-hooks lisp-float-type mwheel ns-win easymenu
tool-bar dnd fontset image fringe lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mldrag 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 loaddefs button
minibuffer faces cus-face text-properties overlay md5 base64 format env
code-pages mule custom widget hashtable-print-readable backquote
make-network-process ns multi-tty emacs)
- bug#5117: 23.1.50; Weird display when wrap-prefix contains tabs,
Matthew Dempsky <=