GNU bug report logs - #72556
29.1.90; vc-diff does not undo hunk in end of source file

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From: Tomas Nordin <tomasn <at> posteo.net>
To: 72556 <at> debbugs.gnu.org
Subject: bug#72556: 29.1.90; vc-diff does not undo hunk in end of source file
Date: Sat, 10 Aug 2024 12:11:08 +0000

Hello Emacs

I have got used to the diff-mode feature of undoing hunks. I have
noticed that if the diff hunk is an addition in the end of the source
file, I dont get the expected question if I want to undo the hunk.
Instead, the hunk is applied again.

My example is with a git repo, some edits made (and saved to disk) in a
file, and hitting C-x v = to view the diff. Move to one of the hunks.
One can now diff-apply-hunk to reverse the hunk. But if that hunk is the
last thing in the source file, the hunk is applied (again). This is not
what I expect.

To reproduce:

$ mkdir apply
$ cd apply
$ echo "first line of code" > example.file
$ git init
$ git add .
$ git commit -m 'init'
$ echo "last line of code" >> example.file
$ emacs -Q example.file

C-x v =
n
C-c C-a

The hunk is applied in the source buffer.

In GNU Emacs 29.1.90 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.16.0) of 2023-11-18 built on fliptop2
Repository revision: d9e43f2197fa1d5ade1d483b15cc50c6d705b969
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)

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
WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

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

Major mode: Fundamental

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
  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 time-date subr-x
smerge-mode diff 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 44032 13907)
 (symbols 48 5959 0)
 (strings 32 16246 1269)
 (string-bytes 1 466537)
 (vectors 16 10894)
 (vector-slots 8 165303 14637)
 (floats 8 28 20)
 (intervals 56 226 0)
 (buffers 976 13))

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