bug#62732: 29.0.60; uniquify-trailing-separator-p affects any buffer whose name matches a dir in CWD

[sbaugh@catern.com]

1. emacs -Q
2. Eval:
(setq uniquify-buffer-name-style 'forward
      uniquify-trailing-separator-p t)
3. Open "Makefile" in the Emacs source tree
4. M-x rename-buffer lisp RET
5. Observe as it is renamed to lisp/ because there happens to be a
directory named lisp in the same directory.

This seems surprising, and also uniquify-trailing-separator-p is
documented to only affect dired buffers, so seems like a bug.

I have a patch which fixes this (and adds tests!) which I'll send in a
followup.


In GNU Emacs 29.0.60 (build 2, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.16.0, Xaw3d scroll bars)
Repository revision: 4b6f2a7028b91128934a19f83572f24106782225
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: NixOS 21.11 (Porcupine)

Configured using:
 'configure
 --prefix=/nix/store/6d12l6xgg6bdqbv2l0k1nkpbixh93ib7-emacs-git-20220225.0
 --disable-build-details --with-modules --with-x-toolkit=lucid
 --with-xft --with-cairo'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XAW3D XDBE XIM XPM LUCID ZLIB

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

Major mode: ELisp/l

Minor modes in effect:
  bug-reference-prog-mode: t
  envrc-global-mode: t
  envrc-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  auto-revert-mode: t
  shell-dirtrack-mode: t
  server-mode: t
  windmove-mode: t
  tracking-mode: t
  savehist-mode: t
  save-place-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-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
  blink-cursor-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/home/sbaugh/.emacs.d/elpa/transient-0.3.7/transient hides /home/sbaugh/.local/src/emacs29/lisp/transient

Features:
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benchmark term ehelp eshell esh-cmd esh-ext esh-opt esh-proc esh-io
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mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr mailabbrev mail-utils gmm-utils mailheader
pcvs-util add-log magit-core magit-autorevert autorevert filenotify
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shorten help-mode flyspell ispell circe-compat ox-odt rng-loc rng-uri
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avl-tree generator org ob ob-tangle ob-ref ob-lob ob-table ob-exp
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org-footnote org-faces org-entities time-date noutline outline icons
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cal-loaddefs org-version org-compat org-macs format-spec gdb-mi bindat
gud easy-mmode comint ansi-osc ansi-color ring ffap thingatpt
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ghub-autoloads treepy-autoloads circe-autoloads inheritenv-autoloads
mentor-autoloads url-scgi-autoloads xml-rpc-autoloads async-autoloads
ggtags-autoloads closql-autoloads emacsql-sqlite-autoloads
emacsql-autoloads magit-autoloads magit-section-autoloads
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cyberpunk-theme-autoloads info dash-autoloads markdown-mode-autoloads
package browse-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie generate-lisp-file url-domsuf url-util mailcap
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
password-cache json subr-x map byte-opt gv bytecomp byte-compile
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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
dynamic-setting system-font-setting font-render-setting cairo x-toolkit
x multi-tty make-network-process emacs)

Memory information:
((conses 16 5991041 619218)
 (symbols 48 79996 40)
 (strings 32 571790 315988)
 (string-bytes 1 40038796)
 (vectors 16 186257)
 (vector-slots 8 3516735 1014181)
 (floats 8 10132 8490)
 (intervals 56 582407 12855)
 (buffers 976 373))