bug#29153: 25.3; Eshell can't quit when read-only commands have been run

[Pierre Neidhardt <ambrevar@gmail.com>]

- emacs -Q

- M-x eshell

- M-:
(let ((prompt "echo foo"))
     (add-text-properties 0 (length prompt)
        '(read-only t
          font-lock-face eshell-prompt
          front-sticky (font-lock-face read-only)
          rear-nonsticky (font-lock-face read-only))
        prompt)
     (insert prompt))

- RET

- C-x k: "Text is read-only"

Explanation: we run a read-only command and the read-only text is added
to history.
But in `eshell-write-history', `insert' will hit a wall when following
read-only text:

    (let ((start (point)))
      (insert (ring-ref ring index) ?\n)

And since `eshell-write-history' is run from the `kill-buffer-hook', the
buffer cannot be killed.

My suggested patch

    (let ((start (point))
          (command (ring-ref ring index)))
      (remove-text-properties 0 (length command) '(read-only t) command)
      (insert command ?\n)

This bug is especially annoying with a multiline prompt since
accidentally pressing RET on any line of the prompt but the last will
insert the read-only prompt into the history.



In GNU Emacs 25.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.16)
 of 2017-11-05 built on dhiov23k
Windowing system distributor 'The X.Org Foundation', version 11.0.11905000
System Description:	Gentoo Base System release 2.4.1

Configured using:
 'configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --disable-dependency-tracking
 --disable-silent-rules --docdir=/usr/share/doc/emacs-25.3
 --htmldir=/usr/share/doc/emacs-25.3/html --libdir=/usr/lib64
 --program-suffix=-emacs-25 --infodir=/usr/share/info/emacs-25
 --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --with-gameuser=:gamestat --without-compress-install
 --with-file-notification=inotify --enable-acl --without-dbus
 --without-modules --without-gpm --without-hesiod --without-kerberos
 --without-kerberos5 --with-xml2 --without-selinux --with-gnutls
 --without-wide-int --with-zlib --with-sound=alsa --with-x --without-ns
 --without-gconf --without-gsettings --without-toolkit-scroll-bars
 --with-gif --with-jpeg --with-png --with-rsvg --with-tiff --with-xpm
 --with-imagemagick --with-xft --without-cairo --without-libotf
 --without-m17n-flt --with-x-toolkit=gtk3 --without-xwidgets
 GENTOO_PACKAGE=app-editors/emacs-25.3 'CFLAGS=-march=ivybridge -O2
 -pipe' CPPFLAGS= 'LDFLAGS=-Wl,-O1 -Wl,--as-needed''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND NOTIFY ACL GNUTLS LIBXML2
FREETYPE XFT ZLIB GTK3 X11

Important settings:
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix