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bug#25150: 26.0.50; sexp motion commands don't work reliably in message-

From: Sean McAfee
Subject: bug#25150: 26.0.50; sexp motion commands don't work reliably in message-mode
Date: Fri, 09 Dec 2016 12:18:45 -0800

Starting from "emacs -Q":

Open a new buffer.

M-x message-mode.

Enter the following two lines of text:


Press C-M-b (backward-sexp).

Point should move to the opening brace, but instead it moves to the opening 
square bracket.

Move point to the opening brace and press C-M-f (forward-sexp).

Point should move to the closing brace, but an "unbalanced parentheses" error 
is raised instead.

If the two lines are joined:


...then both commands work as expected.

If you enter the two-line text above and THEN enter message-mode, the two sexp 
motion commands work as expected.  But if you then enter any additional single 
character in the buffer, the commands behave incorrectly again, as described 

In GNU Emacs (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-10-06 built on sean-virtualbox
Repository revision: d48369db9c97b6f2accf702e5bbe0bda11cb92a1
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:     Ubuntu 16.04.1 LTS

Recent messages:
Mark set [2 times]
forward-sexp: Scan error: "Unbalanced parentheses", 157, 165
Mark set
next-line: End of buffer
Mark set
Mark activated
next-line: End of buffer
Mark set
forward-sexp: Scan error: "Unbalanced parentheses", 1, 7
previous-line: Beginning of buffer
forward-sexp: Scan error: "Unbalanced parentheses", 157, 165
Configured using:
 'configure --with-xwidgets'

Configured features:

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Summary

Minor modes in effect:
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  global-font-lock-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/smcafee1/.emacs.d/elpa/svg-0.1/svg hides 
/home/smcafee1/.emacs.d/elpa/scala-mode-20160902.525/ob-scala hides 
~/emacs/japanese hides /usr/local/share/emacs/26.0.50/lisp/language/japanese

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