bug#41721: 28.0.50; "f is undefined" in list-packages buffer

[Platon Pronko]

1. 'emacs -Q'
2. 'M-x list-packages'
3. 'f'
4. Observe message "f is undefined"

When I type "h", in the help popup "f" is reserved to mean "filter". Online documentation 
also mentions only "f" to filter the packages: 
https://www.gnu.org/software/emacs/manual/html_node/emacs/Package-Menu.html

In describe-mode I see that filtering is done using "/" prefix key, not with 
"f".

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo 
version 1.17.3)
 of 2020-06-04 built on the-big-maker
Repository revision: cdadb7a97cbed523af9f52705d8b03e91d17313f
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
 --with-sound=alsa --with-modules --without-gconf --without-gsettings
 --with-x-toolkit=gtk3 --without-xaw3d --without-compress-install
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -flto'
 CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

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

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

Major mode: Lisp Interaction

Minor modes in effect:
  global-magit-file-mode: t
  magit-file-mode: t
  magit-auto-revert-mode: t
  recentf-mode: t
  rainbow-delimiters-mode: t
  counsel-mode: t
  ivy-mode: t
  smartparens-strict-mode: t
  smartparens-mode: t
  global-git-gutter-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  global-auto-revert-mode: t
  global-whitespace-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/platon/.emacs.d/elpa/ivy-20200605.1134/elpa hides 
/home/platon/.emacs.d/elpa/lispy-20200519.737/elpa
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-ns hides 
/usr/share/emacs/site-lisp/cider-ns
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-classpath hides 
/usr/share/emacs/site-lisp/cider-classpath
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-stacktrace hides 
/usr/share/emacs/site-lisp/cider-stacktrace
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-clojuredocs hides 
/usr/share/emacs/site-lisp/cider-clojuredocs
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-doc hides 
/usr/share/emacs/site-lisp/cider-doc
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider hides 
/usr/share/emacs/site-lisp/cider
/home/platon/.emacs.d/elpa/parseclj-20190531.711/parseclj-ast hides 
/usr/share/emacs/site-lisp/parseclj-ast
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-connection hides 
/usr/share/emacs/site-lisp/cider-connection
/home/platon/.emacs.d/elpa/cider-20200604.1627/nrepl-client hides 
/usr/share/emacs/site-lisp/nrepl-client
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-popup hides 
/usr/share/emacs/site-lisp/cider-popup
/home/platon/.emacs.d/elpa/parseedn-20200419.1124/parseedn hides 
/usr/share/emacs/site-lisp/parseedn
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-cheatsheet hides 
/usr/share/emacs/site-lisp/cider-cheatsheet
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-debug hides 
/usr/share/emacs/site-lisp/cider-debug
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-completion hides 
/usr/share/emacs/site-lisp/cider-completion
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-eval hides 
/usr/share/emacs/site-lisp/cider-eval
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-repl hides 
/usr/share/emacs/site-lisp/cider-repl
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-inspector hides 
/usr/share/emacs/site-lisp/cider-inspector
/home/platon/.emacs.d/elpa/parseclj-20190531.711/parseclj hides 
/usr/share/emacs/site-lisp/parseclj
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-util hides 
/usr/share/emacs/site-lisp/cider-util
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-eldoc hides 
/usr/share/emacs/site-lisp/cider-eldoc
/home/platon/.emacs.d/elpa/parseclj-20190531.711/parseclj-parser hides 
/usr/share/emacs/site-lisp/parseclj-parser
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-browse-ns hides 
/usr/share/emacs/site-lisp/cider-browse-ns
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-macroexpansion hides 
/usr/share/emacs/site-lisp/cider-macroexpansion
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-resolve hides 
/usr/share/emacs/site-lisp/cider-resolve
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-compat hides 
/usr/share/emacs/site-lisp/cider-compat
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-format hides 
/usr/share/emacs/site-lisp/cider-format
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-common hides 
/usr/share/emacs/site-lisp/cider-common
/home/platon/.emacs.d/elpa/a-20180907.953/a hides /usr/share/emacs/site-lisp/a
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-profile hides 
/usr/share/emacs/site-lisp/cider-profile
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-selector hides 
/usr/share/emacs/site-lisp/cider-selector
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-client hides 
/usr/share/emacs/site-lisp/cider-client
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-scratch hides 
/usr/share/emacs/site-lisp/cider-scratch
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-repl-history hides 
/usr/share/emacs/site-lisp/cider-repl-history
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-find hides 
/usr/share/emacs/site-lisp/cider-find
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-test hides 
/usr/share/emacs/site-lisp/cider-test
/home/platon/.emacs.d/elpa/cider-20200604.1627/nrepl-dict hides 
/usr/share/emacs/site-lisp/nrepl-dict
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-overlays hides 
/usr/share/emacs/site-lisp/cider-overlays
/home/platon/.emacs.d/elpa/protobuf-mode-20200520.15/protobuf-mode hides 
/usr/share/emacs/site-lisp/protobuf-mode
/home/platon/.emacs.d/elpa/parseclj-20190531.711/parseclj-lex hides 
/usr/share/emacs/site-lisp/parseclj-lex
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-mode hides 
/usr/share/emacs/site-lisp/cider-mode
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-xref hides 
/usr/share/emacs/site-lisp/cider-xref
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-apropos hides 
/usr/share/emacs/site-lisp/cider-apropos
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-browse-spec hides 
/usr/share/emacs/site-lisp/cider-browse-spec
/home/platon/.emacs.d/elpa/cider-20200604.1627/cider-tracing hides 
/usr/share/emacs/site-lisp/cider-tracing
/home/platon/.emacs.d/elpa/clojure-mode-20200419.559/clojure-mode hides 
/usr/share/emacs/site-lisp/clojure-mode
/home/platon/.emacs.d/elpa/epl-20180205.2049/epl hides 
/usr/share/emacs/site-lisp/epl/epl
/home/platon/.emacs.d/elpa/pkg-info-20150517.1143/pkg-info hides 
/usr/share/emacs/site-lisp/pkg-info/pkg-info
/home/platon/.emacs.d/elpa/queue-0.2/queue hides 
/usr/share/emacs/site-lisp/queue/queue
/home/platon/.emacs.d/elpa/sesman-20190909.1754/sesman-browser hides 
/usr/share/emacs/site-lisp/sesman/sesman-browser
/home/platon/.emacs.d/elpa/sesman-20190909.1754/sesman hides 
/usr/share/emacs/site-lisp/sesman/sesman
/home/platon/.emacs.d/elpa/spinner-1.7.3/spinner hides 
/usr/share/emacs/site-lisp/spinner/spinner
/home/platon/.emacs.d/elpa/less-css-mode-20161001.453/less-css-mode hides 
/usr/share/emacs/28.0.50/lisp/textmodes/less-css-mode

Features:
(shadow sort mail-extr emacsbug sendmail cider-debug cider-repl-history
cider-find cider-scratch pulse cider-inspector cider-browse-ns apropos
cider-mode cider-completion cider-profile cider-eval cider-repl
cider-resolve cider-eldoc cider-test cider-stacktrace cider-overlays
cider-doc cider-browse-spec cider-clojuredocs cider-client
cider-connection sesman-browser nrepl-client queue spinner parseedn
parseclj-parser parseclj-lex a cider-popup cider-common cider-util
smartparens-clojure sesman vc vc-dispatcher clojure-mode align
nrepl-dict cider-compat benchmark vc-git ido autoload tar-mode arc-mode
archive-mode lisp-mnt mm-archive gnutls network-stream url-http url-gw
nsm url-cache url-auth descr-text cus-edit cus-start cus-load ibuf-ext
ibuffer ibuffer-loaddefs cl-print debug mule-util magit-patch
magit-subtree magit-ediff ediff ediff-merg ediff-mult ediff-wind
ediff-diff ediff-help ediff-init ediff-util term disp-table ehelp
sh-script executable scala-mode2 scala-mode2-map scala-mode2-fontlock
scala-mode2-indent scala-mode2-paragraph scala-mode2-syntax
scala-mode2-lib conf-mode term/xterm xterm dabbrev eieio-opt bs sql view
bug-reference magit-extras magit-bookmark magit-submodule magit-obsolete
magit-blame magit-stash magit-reflog magit-bisect magit-push magit-pull
magit-fetch magit-clone magit-remote magit-commit magit-sequence
magit-notes magit-worktree magit-tag magit-merge magit-branch
magit-reset magit-files magit-refs magit-status magit magit-repos
magit-apply magit-wip magit-log which-func magit-diff smerge-mode diff
diff-mode magit-core magit-autorevert magit-margin magit-transient
magit-process magit-mode misearch multi-isearch smartparens-python
python org-indent org-element avl-tree ol-eww ol-rmail ol-mhe ol-irc
ol-info ol-gnus nnir gnus-sum gnus-group gnus-undo gnus-start gnus-cloud
nnimap nnmail mail-source utf7 netrc nnoo gnus-spec gnus-int gnus-range
gnus-win ol-docview doc-view jka-compr image-mode exif ol-bibtex bibtex
ol-bbdb ol-w3m tramp-cache tramp-sh recentf tree-widget bookmark pp ffap
quail rainbow-delimiters lispy pcase lispy-inline avy edebug backtrace
help-fns radix-tree lispy-tags mode-local counsel xdg swiper ivy delsel
ivy-faces ivy-overlay colir smartparens-config smartparens-javascript
smartparens-rust smartparens-ruby smartparens-org smartparens-text
smartparens-html smartparens-c smartparens git-gutter-fringe
fringe-helper git-gutter hydra lv git-commit with-editor async-bytecomp
async transient cl-extra help-mode server magit-git magit-section
magit-utils crm log-edit message rmc dired dired-loaddefs rfc822 mml
mml-sec epa epg epg-config mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader pcvs-util dash tramp
tramp-loaddefs trampver tramp-integration files-x tramp-compat shell
parse-time iso8601 ls-lisp lpr rust-mode php-mode rx speedbar ezimage
dframe etags fileloop generator xref project flymake-proc flymake
compile warnings add-log cc-langs autorevert filenotify whitespace
sass-mode haml-mode js cc-mode cc-fonts cc-guess cc-menus cc-cmds
cc-styles cc-align cc-engine cc-vars cc-defs css-mode sgml-mode imenu
eww mm-url gnus nnheader gnus-util rmail rmail-loaddefs rfc2047 rfc2045
ietf-drums mail-utils wid-edit mm-util mail-prsvr thingatpt url-queue
url url-proxy url-privacy url-expand url-methods url-history mailcap shr
text-property-search url-cookie url-domsuf url-util puny svg xml dom
color ruby-mode smie windmove besi derived scala-mode-inf cl
scala-mode-constants scala-mode-lib scala-mode-ui textindent edmacro
kmacro org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro
org-footnote org-src ob-comint org-pcomplete pcomplete comint ansi-color
ring org-list org-faces org-entities time-date noutline outline
easy-mmode org-version ob-emacs-lisp ob-core ob-eval org-table ol
org-keys org-compat advice org-macs org-loaddefs format-spec find-func
cal-menu calendar cal-loaddefs darcula-theme finder-inf
scala-mode2-autoloads info package easymenu browse-url url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache json subr-x map url-vars seq byte-opt gv bytecomp
byte-compile cconv cl-loaddefs cl-lib tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type 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 elisp-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame minibuffer cl-generic 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 charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify lcms2 dynamic-setting
font-render-setting cairo move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 2128452 299170)
  (symbols 48 65145 40)
  (strings 32 329750 47799)
  (string-bytes 1 12168452)
  (vectors 16 104653)
  (vector-slots 8 1734436 123099)
  (floats 8 414 625)
  (intervals 56 208232 2133)
  (buffers 992 60))