bug#74352: 29.4; emerge-files with tramp + local file fails

["Jörg Sommer" <joerg@jo-so.de>]

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Hi,

when running `emerge-files` with `/ssh:remote:file` and `~/local-file` I get
the buffer `*emerge-diff-errors*` with:

```
diff: /tmp/tramp.wlcRNL: No such file or directory
diff: /home/joerg/local-file: No such file or directory
```

This change solves the problem:

```diff
diff --git lisp/vc/emerge.el lisp/vc/emerge.el
index ca48f2f3c7b..562041e4232 100644
--- lisp/vc/emerge.el
+++ lisp/vc/emerge.el
@@ -581,6 +581,7 @@ emerge-make-diff-list
   (setq emerge-diff-buffer (get-buffer-create "*emerge-diff*"))
   (with-current-buffer
       emerge-diff-buffer
+    (setq default-directory (file-name-directory file-A))
     (erase-buffer)
     (shell-command
      (format "%s %s %s %s"
```

Regards Jörg

In GNU Emacs 29.4 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.42, cairo
 version 1.18.0) of 2024-06-30, modified by Debian built on sbuild
System Description: Debian GNU/Linux trixie/sid

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/libexec --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --with-libsystemd
 --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.4/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.4/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man
 --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/29.4/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/29.4/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --with-pgtk 'CFLAGS=-g -O2
 -Werror=implicit-function-declaration
 -ffile-prefix-map=/build/reproducible-path/emacs-29.4+1=.
 -fstack-protector-strong -fstack-clash-protection -Wformat
 -Werror=format-security -fcf-protection -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB

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

Major mode: Shell-script

Minor modes in effect:
  async-bytecomp-package-mode: t
  sh-electric-here-document-mode: t
  treemacs-filewatch-mode: t
  treemacs-follow-mode: t
  treemacs-git-mode: t
  treemacs-fringe-indicator-mode: t
  desktop-save-mode: t
  global-whitespace-mode: t
  which-key-mode: t
  recentf-mode: t
  global-git-commit-mode: t
  shell-dirtrack-mode: t
  server-mode: t
  global-hl-todo-mode: t
  hl-todo-mode: t
  override-global-mode: t
  company-statistics-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  TeX-PDF-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: #[128 \304\300\301\x03#\207 [yas--auto-fill #[128 \301\302\300!\x02"\207 [auto-fill-function apply default-value] 4 

(fn &rest ARGS)] :around nil apply] 5 advice]
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  abbrev-mode: t

Load-path shadows:
/usr/share/emacs/site-lisp/elpa/devscripts-40/pbuilder-mode hides /usr/share/emacs/site-lisp/elpa-src/devscripts-40/pbuilder-mode
/usr/share/emacs/site-lisp/elpa/devscripts-40/devscripts hides /usr/share/emacs/site-lisp/elpa-src/devscripts-40/devscripts
/usr/share/emacs/site-lisp/elpa/devscripts-40/devscripts-autoloads hides /usr/share/emacs/site-lisp/elpa-src/devscripts-40/devscripts-autoloads
/usr/share/emacs/site-lisp/elpa/devscripts-40/devscripts-pkg hides /usr/share/emacs/site-lisp/elpa-src/devscripts-40/devscripts-pkg
/usr/share/emacs/site-lisp/elpa/devscripts-40/pbuilder-log-view-mode hides /usr/share/emacs/site-lisp/elpa-src/devscripts-40/pbuilder-log-view-mode
/usr/share/emacs/site-lisp/elpa/mutt-alias-1.4/mutt-alias-autoloads hides /usr/share/emacs/site-lisp/elpa-src/mutt-alias-1.4/mutt-alias-autoloads
/usr/share/emacs/site-lisp/elpa/mutt-alias-1.4/mutt-alias-pkg hides /usr/share/emacs/site-lisp/elpa-src/mutt-alias-1.4/mutt-alias-pkg
/usr/share/emacs/site-lisp/elpa/mutt-alias-1.4/mutt-alias hides /usr/share/emacs/site-lisp/elpa-src/mutt-alias-1.4/mutt-alias
/usr/share/emacs/site-lisp/elpa/muttrc-mode-1.2.1/muttrc-mode-autoloads hides /usr/share/emacs/site-lisp/elpa-src/muttrc-mode-1.2.1/muttrc-mode-autoloads
/usr/share/emacs/site-lisp/elpa/muttrc-mode-1.2.1/muttrc-mode-pkg hides /usr/share/emacs/site-lisp/elpa-src/muttrc-mode-1.2.1/muttrc-mode-pkg
/usr/share/emacs/site-lisp/elpa/muttrc-mode-1.2.1/muttrc-mode hides /usr/share/emacs/site-lisp/elpa-src/muttrc-mode-1.2.1/muttrc-mode
/usr/share/emacs/site-lisp/elpa/pod-mode-1.3/pod-mode-pkg hides /usr/share/emacs/site-lisp/elpa-src/pod-mode-1.3/pod-mode-pkg
/usr/share/emacs/site-lisp/elpa/pod-mode-1.3/pod-mode hides /usr/share/emacs/site-lisp/elpa-src/pod-mode-1.3/pod-mode
/usr/share/emacs/site-lisp/elpa/pod-mode-1.3/pod-mode-autoloads hides /usr/share/emacs/site-lisp/elpa-src/pod-mode-1.3/pod-mode-autoloads
/home/joerg/.config/emacs/elpa/transient-20240918.1138/transient hides /usr/share/emacs/29.4/lisp/transient
/home/joerg/.config/emacs/elpa/csharp-mode-20221126.2005/csharp-mode hides /usr/share/emacs/29.4/lisp/progmodes/csharp-mode
/home/joerg/.config/emacs/elpa/project-0.11.1/project hides /usr/share/emacs/29.4/lisp/progmodes/project
/home/joerg/.config/emacs/elpa/xref-1.7.0/xref hides /usr/share/emacs/29.4/lisp/progmodes/xref

Features:
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er-basic-expansions expand-region-core expand-region-custom misearch
multi-isearch helm-x-files helm-for-files helm-bookmark helm-adaptive
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helm-net css-mode sgml-mode facemenu eww url-queue shr pixel-fill kinsoku
url-file svg mm-url gnus nnheader range winner minibuffer-complete-cycle
tramp-archive tramp-gvfs helm-command helm-elisp helm-eval edebug debug
backtrace helm-info helm-mode helm-misc helm-files image-dired
image-dired-tags image-dired-external image-dired-util xdg image-mode exif
helm-buffers helm-occur helm-tags helm-locate helm-grep helm-regexp
helm-utils helm-types helm-help helm helm-global-bindings helm-easymenu
helm-core async-bytecomp helm-source helm-multi-match helm-lib async systemd
conf-mode make-mode view lsp-zig lsp-yang lsp-yaml lsp-xml lsp-wgsl
lsp-volar lsp-vimscript lsp-vhdl lsp-vetur lsp-html lsp-verilog lsp-vala
lsp-v lsp-typeprof lsp-ttcn3 lsp-trunk lsp-toml lsp-tilt lsp-tex
lsp-terraform lsp-svelte lsp-steep lsp-sqls lsp-sql lsp-sorbet lsp-solidity
lsp-solargraph lsp-semgrep lsp-rust lsp-ruff lsp-ruby-syntax-tree
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lsp-markdown lsp-magik lsp-lua lsp-lisp lsp-kotlin lsp-json lsp-jq
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lsp-ui-flycheck lsp-ui-imenu lsp-ui-peek lsp-ui-sideline lsp-ui-doc
goto-addr lsp-ui-util face-remap lsp-modeline lsp-headerline lsp-icons
lsp-diagnostics flycheck lsp-completion lsp-origami origami origami-parsers
lsp-mode lsp-protocol spinner network-stream nsm lv inline ht f ewoc
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jka-compr company-emoji company-emoji-list company-math math-symbol-lists
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Memory information:
((conses 16 1166425 809726)
 (symbols 48 69186 1)
 (strings 32 377226 108544)
 (string-bytes 1 11859790)
 (vectors 16 151735)
 (vector-slots 8 3622097 737749)
 (floats 8 922 3217)
 (intervals 56 223573 4049)
 (buffers 984 62))

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