GNU bug report logs - #63949
30.0.50; `vc-print-log´ does not erase buffer when called from *vc-change-log* buffer, at least for CVS logs

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Jens Schmidt <jschmidt4gnu <at> vodafonemail.de>
Subject: bug#63949: closed (Re: bug#63949: 30.0.50; `vc-print-log´
 does not erase buffer when called from *vc-change-log* buffer, at least
 for CVS logs)
Date: Tue, 18 Jul 2023 00:57:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#63949: 30.0.50; `vc-print-log´ does not erase buffer when called from *vc-change-log* buffer, at least for CVS logs

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 63949 <at> debbugs.gnu.org.

-- 
63949: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63949
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Jens Schmidt <jschmidt4gnu <at> vodafonemail.de>, Eli Zaretskii
 <eliz <at> gnu.org>, Nathan Moreau <nathan.moreau <at> m4x.org>
Cc: 63949-done <at> debbugs.gnu.org
Subject: Re: bug#63949: 30.0.50; `vc-print-log´ does not erase buffer when called from *vc-change-log* buffer, at least for CVS logs
Date: Tue, 18 Jul 2023 03:55:59 +0300

On 17/07/2023 22:53, Jens Schmidt wrote:
> Probably we could have that second patch at least in master?

Yes, of course.

Now pushed to master. Thanks for the report, testing and the reminders. :-)

Closing!

Now if emacs-29 pretest ends up going on for several months more, we 
could consider backporting the second patch. Or maybe do that after, for 
29.2...

[Message part 3 (message/rfc822, inline)]

From: Jens Schmidt <jschmidt4gnu <at> vodafonemail.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50; `vc-print-log´ does not erase buffer when called from *vc-change-log* buffer, at least for CVS logs
Date: Wed, 7 Jun 2023 23:04:50 +0200

Start emacs -Q.  Visit a CVS-controlled file.  Then:

C-x v l
M->
C-x v l

Notice the CVS log added once more after current end of log buffer.

I tracked this down to the following snippet from `vc-do-command´:

    (save-current-buffer
      (unless (or (eq buffer t)
		  (and (stringp buffer)
		       (string= (buffer-name) buffer))
		  (eq buffer (current-buffer)))
        (vc-setup-buffer buffer))

That is, `vc-setup-buffer´ (which erases the buffer) is *not* called if 
the buffer where the VC command is to be executed in equals the current 
buffer.  I guess that logic has a reason, so it probably should be some 
upper layer which should erase *vc-log-buffer*...

For git, for example, function `vc-git-print-log´ calls 
`vc-setup-buffer´.  Probably the other VC backends should follow suit?

If this is the way to go, I could provide patches for VC backends CVS 
and RCS, pls let me know.



In GNU Emacs 30.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version
 3.24.24, cairo version 1.16.0) of 2023-06-07 built on sappc2
Repository revision: a902156068ab071f93cc9bbd34cd320919b74064
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
  value of $LC_COLLATE: POSIX
  value of $LC_TIME: POSIX
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Git-Log-View

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-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
  buffer-read-only: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils parse-time iso8601
time-date subr-x sh-script rx smie treesit cl-seq executable misearch
multi-isearch vc-hg vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs add-log
log-view pcvs-util cl-extra help-mode vc vc-git diff-mode easy-mmode
vc-dispatcher cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc
paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode
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 lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu
timer select scroll-bar mouse jit-lock font-lock syntax font-core
term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine 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 emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
emacs)

Memory information:
((conses 16 61575 13745)
 (symbols 48 7721 0)
 (strings 32 23157 2232)
 (string-bytes 1 634764)
 (vectors 16 14390)
 (vector-slots 8 207631 12167)
 (floats 8 35 32)
 (intervals 56 586 0)
 (buffers 976 13))

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