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bug#28500: 25.3; shell mode starts echoing command

From: Barry A. Warsaw
Subject: bug#28500: 25.3; shell mode starts echoing command
Date: Mon, 18 Sep 2017 11:46:50 -0400

* M-x shell RET
* Go to the shell and type `ls RET`
* See the output of the `ls` but *not* the actual `ls` command
* Enter an interpreter; two choices which reproduce the problem include 
`sqlite3` and `python3`
  Type `sqlite3` at the shell prompt
* Type .exit at the sqlite3 prompt (notice that the `.exit` was echo'd
  before the shell prompt came back; the bug is now active
* Type `ls RET` at the shell prompt.  Notice that the `ls RET` was
  echoed before the ls output was printed.

Note that using `python3` or even `python` at the prompt will also
exhibit the bug.  (To exit Python, just type ctrl-D).  The only way I've
found to "fix" the problem is to ctrl-D to exit the shell, then `M-x
shell RET` to restart it in the same buffer.

In GNU Emacs 25.3.1 (x86_64-apple-darwin16.7.0, NS appkit-1504.83 Version 
10.12.6 (Build 16G29))
 of 2017-09-14 built on resist.local
Windowing system distributor 'Apple', version 10.3.1504
Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --prefix=/usr/local/Cellar/emacs/25.3 --without-x --with-xml2
 --without-dbus --without-gnutls --without-imagemagick --with-ns

Configured features:

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

Major mode: Shell

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-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.
The mark is not set now, so there is no region
Making completion list...

Load-path shadows:
None found.

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mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu
cl-loaddefs pcase cl-lib mail-prsvr mail-utils shell pcomplete comint
ansi-color ring time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel ns-win ucs-normalize
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tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
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cus-face macroexp files text-properties overlay sha1 md5 base64 format
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Memory information:
((conses 16 200070 5259)
 (symbols 48 19931 0)
 (miscs 40 59 194)
 (strings 32 16829 5243)
 (string-bytes 1 489691)
 (vectors 16 33562)
 (vector-slots 8 655967 4691)
 (floats 8 158 281)
 (intervals 56 252 16)
 (buffers 976 20))

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