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bug#23339: 24.5; align-region assumes that match does not contain newlin


From: Josh
Subject: bug#23339: 24.5; align-region assumes that match does not contain newline
Date: Thu, 21 Apr 2016 23:20:19 -0700

The align-region function assumes that a matching regexp does not
contain a newline.  This causes unexpected behavior in cases where the
first "column" being aligned contains only whitespace.  The following
script exhibits the unexpected behavior:

emacs -Q --eval '(progn
 (switch-to-buffer "*test*")
 (text-mode)
 (setq indent-tabs-mode nil)
 (insert "lorem ipsum, dolor sit amet,\n ,,\n")
 (let ((table (make-syntax-table (syntax-table))))
   ;; (modify-syntax-entry ?\n ">" table) ; <= UNCOMMENT THIS LINE TO FIX
   (with-syntax-table table
   (align-regexp (point-min) (point-max) "\\(\\s-*\\)," 1 1 t))))'

Uncommenting the seventh line and running again will show the expected
behavior.  The fix works around the problem by using a syntax map in
which the newline character does not belong to the whitespace syntax
class, thus preventing \s-* from matching the newline.


In GNU Emacs 24.5.1 (x86_64-apple-darwin13.4.0, NS apple-appkit-1265.21)
 of 2015-04-10 on builder10-9.porkrind.org
Windowing system distributor `Apple', version 10.3.1348
Configured using:
 `configure --with-ns '--enable-locallisppath=/Library/Application
 Support/Emacs/${version}/site-lisp:/Library/Application
 Support/Emacs/site-lisp''

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Text

Minor modes in effect:
  tooltip-mode: t
  electric-indent-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 messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util help-fns mail-prsvr mail-utils align time-date tooltip electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel ns-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
prog-mode 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 72780 5795)
 (symbols 48 17281 0)
 (miscs 40 39 123)
 (strings 32 10041 4622)
 (string-bytes 1 277927)
 (vectors 16 9051)
 (vector-slots 8 373020 18497)
 (floats 8 53 150)
 (intervals 56 167 0)
 (buffers 960 12))





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