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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*")
 (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

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.

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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
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utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
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text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
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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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