bug#40690: 27.0.91; C-u M-! no longer inserts output at point

bug#40690: 27.0.91; C-u M-! no longer inserts output at point

[Philipp Stephani]

The help text for M-! says

"With prefix argument, insert the COMMAND’s output at point."

However, in Emacs 27 this is no longer the case if
`shell-command-dont-erase-buffer' is `beg-last-out'.

Run

emacs -Q -eval "(setq shell-command-dont-erase-buffer 'beg-last-out)"

Hit M-< to go to the beginning of the scratch buffer.  Execute

C-u M-! echo hi RET

or any other command producing output.  In Emacs 26.3, the output is
inserted at point, but in Emacs 27, it's inserted at the end of the
buffer.



In GNU Emacs 27.0.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.13)
 of 2020-04-17
Repository revision: 6b297519b580df27d8721943f55629689b4c83e0
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux rodete

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --enable-checking=all --enable-gtk-deprecation-warnings
 --enable-gcc-warnings=warn-only --enable-check-lisp-object-type
 --with-mailutils --without-pop 'CFLAGS=-O0 -g3' LDFLAGS=-g3'

Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY
LIBSELINUX GNUTLS FREETYPE HARFBUZZ XFT ZLIB TOOLKIT_SCROLL_BARS GTK3
X11 XDBE XIM MODULES THREADS PDUMPER GMP

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  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

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec epa epg epg-config gnus-util
rmail rmail-loaddefs text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils phst skeleton
derived edmacro kmacro pcase ffap thingatpt url-parse auth-source cl-seq
eieio eieio-core cl-macs eieio-loaddefs password-cache json map url-vars
subr-x rx gnutls puny seq byte-opt gv bytecomp byte-compile cconv dbus
xml cl-loaddefs cl-lib tooltip eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
tab-bar menu-bar rfn-eshadow isearch timer select scroll-bar mouse
jit-lock font-lock syntax facemenu font-core term/tty-colors frame
minibuffer 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
composite charscript charprop case-table epa-hook jka-cmpr-hook help
simple abbrev obarray 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
threads dbusbind inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 60634 7639)
 (symbols 48 8244 1)
 (strings 32 21019 1549)
 (string-bytes 1 684582)
 (vectors 16 12145)
 (vector-slots 8 169126 7408)
 (floats 8 25 34)
 (intervals 56 198 0)
 (buffers 1000 12))

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bug#40690: 27.0.91; C-u M-! no longer inserts output at point

[Eli Zaretskii]

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Sat, 18 Apr 2020 00:05:43 +0200
> 
> The help text for M-! says
> 
> "With prefix argument, insert the COMMAND’s output at point."
> 
> However, in Emacs 27 this is no longer the case if
> `shell-command-dont-erase-buffer' is `beg-last-out'.
> 
> Run
> 
> emacs -Q -eval "(setq shell-command-dont-erase-buffer 'beg-last-out)"
> 
> Hit M-< to go to the beginning of the scratch buffer.  Execute
> 
> C-u M-! echo hi RET
> 
> or any other command producing output.  In Emacs 26.3, the output is
> inserted at point, but in Emacs 27, it's inserted at the end of the
> buffer.

Thanks, I hope I fixed this now on the emacs-27 branch.

bug#40690: 27.0.91; C-u M-! no longer inserts output at point

[Philipp Stephani]

Am Sa., 18. Apr. 2020 um 11:02 Uhr schrieb Eli Zaretskii <eliz@gnu.org>:
>
> > From: Philipp Stephani <p.stephani2@gmail.com>
> > Date: Sat, 18 Apr 2020 00:05:43 +0200
> >
> > The help text for M-! says
> >
> > "With prefix argument, insert the COMMAND’s output at point."
> >
> > However, in Emacs 27 this is no longer the case if
> > `shell-command-dont-erase-buffer' is `beg-last-out'.
> >
> > Run
> >
> > emacs -Q -eval "(setq shell-command-dont-erase-buffer 'beg-last-out)"
> >
> > Hit M-< to go to the beginning of the scratch buffer.  Execute
> >
> > C-u M-! echo hi RET
> >
> > or any other command producing output.  In Emacs 26.3, the output is
> > inserted at point, but in Emacs 27, it's inserted at the end of the
> > buffer.
>
> Thanks, I hope I fixed this now on the emacs-27 branch.

Confirmed, thanks.