bug#56336: 28.1.90; [28.1] Emacs prompts for password when output from async command contains "password:"

[Jan Synáček]

When the output from a command spawned with 'M-&' (async-shell-command)
ends with "password:" Emacs prompts for a password.

Reproducer:
0) $ cat /tmp/test.txt
   enter your password:
1) emacs -Q
2) Press 'M-&', enter 'cat /tmp/test.txt' as input and hit enter.
3) Emacs prompts for a password.

I expect that 3) should not happen as the output is simply to stdout and
no stdin input is expected. Note that the reproducer is minimal and a
bit contrived but the real bug showed itself when I was running a big
test suite that contained several lines ending with "password:" in its
output.

I've also tested this with the latest master (commit
3a4c408a7b6f3df5ca0eb4a406efbdb4899e9742), where it sometimes happens as
well and sometimes you just get an error like this:

Error running timer: (error "Buffer *Async Shell Command* has no process")


In GNU Emacs 28.1.90 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.34, cairo 
version 1.17.6)
 of 2022-07-01 built on jsynacek-home
Repository revision: 7e33618bbc07b65c36744db8e7ef219d2d942456
Repository branch: emacs-28
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Arch Linux

Configured using:
 'configure --with-imagemagick --with-json --with-native-compilation
 --prefix=/home/jsynacek/emacs'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB

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

Major mode: Dired by name

Minor modes in effect:
  windmove-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  shell-dirtrack-mode: t
  global-so-long-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/jsynacek/.emacs.d/elpa/transient-20220514.945/transient hides 
/home/jsynacek/emacs/share/emacs/28.1.90/lisp/transient

Features:
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compile text-property-search comint ansi-color ring slime-autoloads info
package browse-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util mailcap url-handlers
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json map url-vars comp comp-cstr warnings subr-x rx cl-seq cl-macs
cl-extra help-mode seq byte-opt gv cl-loaddefs cl-lib bytecomp
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dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit x multi-tty make-network-process
native-compile emacs)

Memory information:
((conses 16 625701 124605)
 (symbols 48 28318 7)
 (strings 32 137451 11163)
 (string-bytes 1 4439546)
 (vectors 16 65984)
 (vector-slots 8 1019313 83933)
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 (buffers 992 42))