bug#60411: 29.0.60; minibuffer-next-completion skips first candidate when completions-header-format and completion-show-help are nil

[Knut Anders Hatlen]

1. Evaluate: (setopt completions-header-format nil completion-show-help nil)

2. Type M-x followed by TAB. The *Completions* buffer pops up and shows
all available commands.

3. Type M-<down>.

Expected result: The first candidate in *Completions* is selected.

Actual result: The second candidate in *Completions* is selected.


In GNU Emacs 29.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.35, cairo version 1.16.0) of 2022-12-29 built on dell
Repository revision: 909091d7578b7225601b202fb9257dedae879e9a
Repository branch: emacs-29
System Description: Debian GNU/Linux bookworm/sid

Configured using:
 'configure --with-json --with-xml2 --with-modules
 --prefix=/usr/local/stow/emacs --with-pgtk --without-x
 --with-native-compilation --with-tree-sitter'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBOTF LIBSELINUX 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: nn_NO.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  flyspell-mode: t
  hl-line-mode: t
  electric-pair-mode: t
  display-line-numbers-mode: t
  elide-head-mode: t
  flymake-mode: t
  winner-mode: t
  windmove-mode: t
  server-mode: t
  which-function-mode: t
  savehist-mode: t
  save-place-mode: t
  repeat-mode: t
  recentf-mode: t
  minibuffer-depth-indicate-mode: t
  marginalia-mode: t
  global-so-long-mode: t
  global-auto-revert-mode: t
  dynamic-completion-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  column-number-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/kah/.emacs.d/elpa/29/transient-0.3.7/transient hides 
/usr/local/stow/emacs/share/emacs/29.0.60/lisp/transient

Features:
(shadow sort ecomplete mail-extr emacsbug nndraft nnmh format-spec nnml
utf-7 epa-file network-stream nsm nnfolder nnnil gnus-agent gnus-srvr
gnus-score score-mode nnvirtual gnus-msg nntp gnus-cache gnus-art mm-uu
mml2015 mm-view mml-smime smime gnutls dig gnus-sum shr pixel-fill
kinsoku url-file svg dom gnus-group gnus-undo gnus-start gnus-dbus dbus
xml gnus-cloud nnimap nnmail mail-source utf7 nnoo parse-time iso8601
gnus-spec gnus-int gnus-range message sendmail yank-media puny dired
dired-loaddefs rfc822 mml mml-sec epa derived epg rfc6068 epg-config
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev gmm-utils mailheader gnus-win gnus nnheader
gnus-util mail-utils range mm-util mail-prsvr add-log comp comp-cstr
flyspell ispell hl-line elec-pair display-line-numbers elide-head
time-date checkdoc lisp-mnt flymake-proc flymake project compile
text-property-search comint ansi-osc ansi-color warnings thingatpt
cus-edit pp rx winner ring windmove disp-table server icons cl-extra
help-mode which-func imenu savehist saveplace repeat recentf tree-widget
wid-edit mb-depth marginalia magit-autorevert magit-git magit-section
magit-utils crm dash so-long autorevert filenotify completion cus-load
embark-autoloads boxquote-autoloads slime-autoloads marginalia-autoloads
orderless-autoloads info 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 url-vars cl-loaddefs cl-lib rmc iso-transl tooltip
cconv eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel term/pgtk-win pgtk-win term/common-win pgtk-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
gtk pgtk lcms2 multi-tty make-network-process native-compile emacs)

Memory information:
((conses 16 268356 18660)
 (symbols 48 20764 2)
 (strings 32 67439 3954)
 (string-bytes 1 2195945)
 (vectors 16 37980)
 (vector-slots 8 699322 30627)
 (floats 8 291 38)
 (intervals 56 389 0)
 (buffers 984 15))

-- 
Knut Anders