Subject: bug#31048: 27.0.50; With -daemon, "emacsclient -c" on a modified file fails to display frame

From: Bruce Stephens <[email-masked]>
Date: Tue, 03 Apr 2018 17:10:25 +0100

On GNU/Linux (with gtk+), after "emacs -Q -daemon", if I do "emacsclient
-c /tmp/foo" (for some existing /tmp/foo) then exit that frame (so the
server still has /tmp/foo in a buffer but has no visible frames), then
"touch /tmp/foo" and try to repeat "emacsclient -c /tmp/foo" the
emacsclient hangs and no frame is displayed.

I would expect a frame to appear with "Revert buffer from file
/tmp/foo?".

The commit that caused the change seems to be the following one, and
reverting that fixes the hang (and returns the behaviour I was
expecting):

commit 49fc040077b33bd1e78ee425575e76329b772a41 (tag: bad, refs/bisect/bad)
Author: Aaron Jensen <[email-masked]>
Date:   Fri Feb 16 17:43:04 2018 +0200

    Don't flash previous buffer when connecting with emacsclient
    
    * lisp/server.el (server-execute): Accept lambda for creating
    frame rather than frame.  Ensure newly created tty frame
    initially shows the correct buffer.
    (server-process-filter): Pass a lambda to server-execute to create
    a frame.  (Bug#24218)

In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.29)
 of 2018-04-03, modified by Debian built on tinier
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Debian GNU/Linux buster/sid

Recent messages:
Loading /local/brs/.emacs-snapshot...done
Starting Emacs daemon.
frame
frame is x
When done with this frame, type C-x 5 0
frame
frame is x
Quit [2 times]
Composing main Info directory...done
Making completion list...

Configured using:
 'configure --build x86_64-linux-gnu --host x86_64-linux-gnu
 --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var --infodir=/usr/share/info/emacs-snapshot
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/27.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.0.50/site-lisp:/usr/share/emacs/site-lisp
 --with-crt-dir=/usr/lib/x86_64-linux-gnu/ --with-wide-int --with-x=yes
 --with-x-toolkit=gtk3 --with-imagemagick=yes 'CFLAGS=-DDEBIAN
 -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' 'LDFLAGS=-g -Wl,--as-needed -znocombreloc''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LCMS2

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

Major mode: Fundamental

Minor modes in effect:
  show-paren-mode: t
  async-bytecomp-package-mode: t
  gud-tooltip-mode: t
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-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
  line-number-mode: t
  transient-mark-mode: t

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/local/brs/elisp/undo-tree/undo-tree hides /local/brs/.emacs.d/elpa/undo-tree-20170706.246/undo-tree
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/usr/share/emacs/27.0.50/site-lisp/debian-startup hides /usr/share/emacs/site-lisp/debian-startup
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