Subject: 23.3; read-char inappropriate echo area content

From: Bob Newell <[email-masked]>
Date: Thu, 01 Aug 2013 21:12:41 -1000

If you run this minimal code:

(defun minimal-function ()
  (interactive)
    (while t
      (read-char-exclusive " ")
    )
)

everything works as expected, that is typed characters are simply
absorbed until C-g exits the loop. But notice the " " as the prompt arg
in read-char-exclusive. Why is it there?

Because if you run this:

(defun minimal-function ()
  (interactive)
    (while t
      (read-char-exclusive)
    )
)

everything you've typed since you've invoked the function shows up in
the echo area, like this:

ESC x m i n i m a l - f u n c t i o n RET a b c d e f g    (etc.)

I thought this might have something to do with minibuffer history, but I
can't verify that, and I've dived into EMACS source code without luck
(maybe without skill, too). I'm deep into keyboard.c and wondering...

Using "" instead of " " as a prompt does not work; the echoing still
happens.

read-char exhibits the exact same behavior.

I'm on 23.3.1 but I was told on gnus.emacs.help that the latest 24.x
builds show the same behavior (I can't verify personally.)

In GNU Emacs 23.3.1 (i686-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2013-05-16 on komainu, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
configured using `configure  '--build' 'i686-linux-gnu' '--build' 'i686-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.3/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.3/leim' '--with-crt-dir=/usr/lib/i386-linux-gnu' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i686-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Article

Minor modes in effect:
  iswitchb-mode: t
  anything-dired-mode: Enable anything completion in Dired functions.
Bindings affected are C, R, S, H.
This is deprecated for Emacs24+ users, use `ac-mode' instead.
  shell-dirtrack-mode: t
  display-time-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<escape> x r e p o r t - <return> e m a c s - b u g 
<return> C-g C-x C-f d a t a / e l i s p / m i n i 
m a l . e l <return> <left> <left> <escape> <backspace> 
<backspace> C-x C-s <escape> ` l B <escape> x m i n 
i m a l - f u n c t i o n <return> a a a a a C-g <right> 
<right> SPC C-x C-s <escape> ` l B <escape> x <up> 
<return> d d d d d d C-g C-x b * G <return> <return> 
<return> q <return> 2 0 0 <return> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <up> <up> 
<up> <return> C-x o <down> C-SPC <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <escape> w <escape> x r e p o r t - e m a c 
s - b u g <return>

Recent messages:
Compiling /home/bnewell/data/elisp/minimal.el...done
Wrote /home/bnewell/data/elisp/minimal.elc
Loading /home/bnewell/data/elisp/minimal.elc...done
Quit
Parsing BBDB... (frobnicating...done)
name mismatch: "chipschap" changed to "Bob Newell"
Mark set
Saved text from "If you run this minimal code:

(defun mi"

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/usr/share/emacs/site-lisp/w3m/w3m-perldoc hides /usr/share/emacs23/site-lisp/w3m/w3m-perldoc
/usr/share/emacs/site-lisp/w3m/w3m-symbol hides /usr/share/emacs23/site-lisp/w3m/w3m-symbol
/usr/share/emacs/site-lisp/w3m/w3m-rss hides /usr/share/emacs23/site-lisp/w3m/w3m-rss
/usr/share/emacs/site-lisp/w3m/w3mhack hides /usr/share/emacs23/site-lisp/w3m/w3mhack
/usr/share/emacs/site-lisp/w3m/w3m-lnum hides /usr/share/emacs23/site-lisp/w3m/w3m-lnum
/usr/share/emacs/site-lisp/w3m/w3m-bug hides /usr/share/emacs23/site-lisp/w3m/w3m-bug
/usr/share/emacs/site-lisp/w3m/w3m-util hides /usr/share/emacs23/site-lisp/w3m/w3m-util
/usr/share/emacs/site-lisp/w3m/w3m-form hides /usr/share/emacs23/site-lisp/w3m/w3m-form
/usr/share/emacs/site-lisp/w3m/w3m-ccl hides /usr/share/emacs23/site-lisp/w3m/w3m-ccl
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/usr/share/emacs/site-lisp/w3m/w3m-load hides /usr/share/emacs23/site-lisp/w3m/w3m-load
/usr/share/emacs/site-lisp/w3m/octet hides /usr/share/emacs23/site-lisp/w3m/octet
/usr/share/emacs/site-lisp/w3m/w3m-cookie hides /usr/share/emacs23/site-lisp/w3m/w3m-cookie
/usr/share/emacs/site-lisp/w3m/w3m-search hides /usr/share/emacs23/site-lisp/w3m/w3m-search
/usr/share/emacs/site-lisp/w3m/w3m-tabmenu hides /usr/share/emacs23/site-lisp/w3m/w3m-tabmenu
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/usr/share/emacs/23.3/lisp/gnus/hex-util hides /usr/share/emacs23/site-lisp/flim/hex-util
~/data/elisp/evernote-mode hides /usr/share/emacs23/site-lisp/evernote-mode/evernote-mode
/usr/share/emacs/23.3/site-lisp/auctex/tex-font hides /usr/share/emacs/site-lisp/auctex/tex-font
/usr/share/emacs/23.3/site-lisp/auctex/tex-buf hides /usr/share/emacs/site-lisp/auctex/tex-buf
/usr/share/emacs/23.3/site-lisp/auctex/texmathp hides /usr/share/emacs/site-lisp/auctex/texmathp
/usr/share/emacs/23.3/site-lisp/auctex/latex hides /usr/share/emacs/site-lisp/auctex/latex
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/usr/share/emacs/23.3/site-lisp/auctex/tex-style hides /usr/share/emacs/site-lisp/auctex/tex-style
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/usr/share/emacs/23.3/site-lisp/auctex/tex-fold hides /usr/share/emacs/site-lisp/auctex/tex-fold
/usr/share/emacs/23.3/site-lisp/auctex/multi-prompt hides /usr/share/emacs/site-lisp/auctex/multi-prompt
/usr/share/emacs/23.3/site-lisp/auctex/tex-jp hides /usr/share/emacs/site-lisp/auctex/tex-jp
/usr/share/emacs/23.3/site-lisp/auctex/bib-cite hides /usr/share/emacs/site-lisp/auctex/bib-cite
/usr/share/emacs/23.3/site-lisp/auctex/toolbar-x hides /usr/share/emacs/site-lisp/auctex/toolbar-x
/usr/share/emacs/23.3/lisp/gnus/lpath hides /usr/share/emacs/site-lisp/auctex/lpath
/usr/share/emacs23/site-lisp/mailcrypt/mc-gpg hides /usr/share/emacs/site-lisp/mailcrypt/mc-gpg
/usr/share/emacs23/site-lisp/mailcrypt/mc-pgp6 hides /usr/share/emacs/site-lisp/mailcrypt/mc-pgp6
/usr/share/emacs23/site-lisp/mailcrypt/expect hides /usr/share/emacs/site-lisp/mailcrypt/expect
/usr/share/emacs23/site-lisp/mailcrypt/mailcrypt hides /usr/share/emacs/site-lisp/mailcrypt/mailcrypt
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~/data/elisp/message-x hides /usr/share/emacs/23.3/site-lisp/gnus-bonus-el/message-x
/usr/share/emacs/23.3/lisp/gnus/nnnil hides /usr/share/emacs/23.3/site-lisp/gnus-bonus-el/nnnil
/usr/share/emacs/23.3/site-lisp/cmake-data/cmake-mode hides /usr/share/emacs/site-lisp/cmake-mode
/usr/share/emacs/23.3/site-lisp/debian-startup hides /usr/share/emacs/site-lisp/debian-startup
~/data/elisp/gnugo hides /usr/share/emacs/site-lisp/gnugo
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~/data/elisp/iimage hides /usr/share/emacs/23.3/lisp/iimage
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/usr/share/emacs23/site-lisp/dictionaries-common/ispell hides /usr/share/emacs/23.3/lisp/textmodes/ispell
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/usr/share/emacs/23.3/lisp/gnus/hmac-md5 hides /usr/share/emacs/23.3/lisp/net/hmac-md5
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~/data/elisp/unsafep hides /usr/share/emacs/23.3/lisp/emacs-lisp/unsafep
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~/data/elisp/timeclock hides /usr/share/emacs/23.3/lisp/calendar/timeclock

Features:
(shadow qp sort smiley ansi-color gnus-cite gnus-async gnus-bcklg
gnus-ml mailcrypt disp-table tmm electric emacsbug help-mode view
cal-china lunar solar cal-dst cal-bahai cal-islam cal-hebrew diary-lib
diary-loaddefs cal-iso vc-rcs org-w3m org-inlinetask org-habit org-info
org-gnus org-bibtex bibtex org-bbdb org-agenda w3m w3m-hist w3m-e23
w3m-ccl ccl w3m-fsf w3m-favicon w3m-image w3m-proc w3m-util nndoc
nndraft nnmh nnfolder utf-7 gnus-agent gnus-srvr gnus-score score-mode
nnvirtual gnus-msg gnus-cache bbdb-gnus gnus-art mm-uu mml2015
epg-config mm-view mml-smime smime dig bbdb-snarf mail-extr bbdb-com
proto-stream nnimap tls utf7 netrc nntp nnir gnus-sum gnus-group
gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int gnus-range
message rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse
rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev gmm-utils mailheader
gnus-win nnoo bbdb timezone smtpmail sendmail starttls gnus-load gnus
gnus-ems gnus-compat nnheader mail-utils iswitchb printing ps-print
ps-def lpr timeclock-setup timeclock-x saveplace parse-time calfw-cal
calfw holidays hol-loaddefs mule-util cal-move anything-startup
anything-complete anything-show-completion anything-obsolete
anything-config edmacro kmacro rx anything-match-plugin url url-proxy
url-privacy url-expand url-methods url-history url-cookie mailcap grep
compile tramp-imap assoc tramp-gw tramp-gvfs zeroconf url-util url-parse
url-vars dbus xml tramp-fish tramp-smb tramp-cache tramp-ftp tramp-cmds
tramp auth-source eieio gnus-util mm-util mail-prsvr shell
password-cache tramp-compat trampver dired-x dired-aux ffap thingatpt
anything ange-ftp gdocs browse-url g-app g-auth g-utils json
evernote-mode tree-widget tea-time emms-volume emms-volume-amixer
emms-cache emms-info-ogginfo emms-info-mp3info emms-info later-do
emms-playlist-mode emms-player-vlc emms-player-mplayer
emms-player-simple emms-source-playlist emms-source-file dired
emms-setup emms emms-compat iimage taskjuggler-mode malyon malyon-mode
analog-clock artist picture reporter rect stopwatch w3m-e21 calc-ext
calc calc-loaddefs calc-macs org-extension org byte-opt warnings
bytecomp byte-compile advice help-fns advice-preload org-macro
org-footnote org-pcomplete pcomplete org-list org-faces org-entities
time-date noutline outline org-version ob-emacs-lisp ob ob-tangle
org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint comint ring
ob-core ob-eval org-compat org-macs org-loaddefs format-spec find-func
regexp-opt cal-menu calendar cal-loaddefs org-autoloads
org-plus-contrib-autoloads info xclip-autoloads package color-theme
easymenu wid-edit cl cl-19 timeclock time cus-start cus-load w3m-wget
w3m-load mailcrypt-init emms-auto emacs-goodies-el emacs-goodies-custom
emacs-goodies-loaddefs easy-mmode bbdb-autoloads preview-latex tex-site
auto-loads tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win
x-dnd font-setting tool-bar dnd fontset image fringe lisp-mode register
page menu-bar rfn-eshadow timer select scroll-bar mldrag mouse jit-lock
font-lock syntax facemenu font-core frame cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew
greek romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev loaddefs button
minibuffer faces cus-face files text-properties overlay md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind system-font-setting
font-render-setting gtk x-toolkit x multi-tty emacs)