bug#23993: 25.0.91; cursor vanishes at prompt

[David Reitter]

The following configuration makes the cursor vanish when at the end of a 
*shell* buffer.

Emacs -Q
(shell)
;; evaluate this somewhere:
(set-face-attribute 'comint-highlight-prompt nil :height 100)

Select the window with the *shell* buffer, maybe press Enter to add a line with 
a prompt.

In practice, this occurs in a more complex configuration, too - in other comint 
buffers, and with various font height configurations, or with fonts enlarged 
via face-remapping-alist.   This is happens all the time in the Aquamacs 
configuration.

I think it’s new in -25, but I haven’t checked.






In GNU Emacs 25.0.91.1 (x86_64-apple-darwin15.3.0, NS appkit-1404.34 Version 
10.11.3 (Build 15D21))
 of 2016-02-29 built on momo.local
Repository revision: 52f64cc2e74ab83752c8f2d37ef0fc6df5ef8b30
Windowing system distributor 'Apple', version 10.3.1404
Configured features:
RSVG DBUS NOTIFY ACL LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS

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

Major mode: Lisp Interaction

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.
Mark set
#<buffer *shell*>
nil
delete-backward-char: Text is read-only
Making completion list...

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec 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 term/common-win tool-bar dnd
fontset image regexp-opt fringe 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 cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind kqueue cocoa
ns multi-tty make-network-process emacs)

Memory information:
((conses 16 200111 8791)
 (symbols 48 19905 0)
 (miscs 40 67 221)
 (strings 32 16966 5230)
 (string-bytes 1 496093)
 (vectors 16 33469)
 (vector-slots 8 654559 5173)
 (floats 8 164 119)
 (intervals 56 231 0)
 (buffers 976 13))