bug#28500: 25.3; shell mode starts echoing command

[Mike Kupfer]

I see the same issue after using openssl to encrypt or decrypt a file.
Just never got around to filing a bug report...

-----8<-----8<-----
alto$ openssl aes-256-cbc -in foo.txt -out foo.text.enc
enter aes-256-cbc encryption password:
Verifying - enter aes-256-cbc encryption password:
alto$ ls
ls
deb9-upgrade.log  foo.text.enc  ieee-cs-election-receipt.pdf
enchant.dummy*    foo.txt       net-neutrality-comments.pdf
alto$ echo $SHELL
echo $SHELL
/bin/bash
alto$ 
----->8----->8-----

I see this on Debian 8 and on Solaris, with various versions of Emacs.

mike