bug#53590: 28.0.91; icompletion-vertical-mode gets stuck on 'M-x man RET awk'

[Van Ly <van.ly@sdf.org>]

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When the icompletion-vertical-mode setting is on, looking up a manpage
feels unresponsive, for example, looking up 'awk' echoes 'a' in the
minibuffer at the 'Manual entry:' prompt, then finds
'awk [No matches]' but shows the manpage on RET.

When completion-styles is

> (basic partial-completion emacs22)

# steps to reproduce behavior
* start by 'emacs -Q'
* customize 'icompletion-vertical-mode' to enable for session
* type 'M-x man RET awk'

# observed behavior
# minibuffer at 'Manual entry:' prompt
* shows 'a' of awk and is unresponsive, then 'awk [No matches]' shows
* awk RET shows *Man awk* AWK(1) page

# expected behavior
# minibuffer at 'Manual entry:' prompt
* progressively shows 'a' 'aw' 'awk' while typing
* progressively shows icompletion-vertical-mode suggestions
* awk RET shows *Man awk* AWK(1) page

-- 
vl

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In GNU Emacs 28.0.91 (build 1, x86_64--netbsd)
 of 2022-01-26 built on charlie
Repository revision: 3cf5af93293a4137550fcff623d6e2da25eed829
Repository branch: scratch/uni-unihan-readings
System Description: NetBSD charlie 9.2 NetBSD 9.2 (base) #3: Wed Jun 23 20:26:53 AEST 2021  uncle@charlie:/usr/src/sys/arch/amd64/compile/obj/base amd64

Configured using:
 'configure --without-all --without-x --without-compress-install
 --localstatedir=/var --disable-autodepend
 --prefix=/usr/X/Projects/emacs-28.0.91 --build=x86_64--netbsd
 --host=x86_64--netbsd --enable-option-checking=yes --without-pop
 --without-mailutils 'CFLAGS=-O2 -D_FORTIFY_SOURCE=2 -I/usr/include'
 'CPPFLAGS=-DTERMINFO -I/usr/include' 'LDFLAGS=-L/usr/lib -Wl,-R/usr/lib
 -Wl,-R/usr/pkg/lib''

Configured features:
JSON PDUMPER

Important settings:
  value of $LC_ALL: en_AU.UTF-8
  value of $LC_CTYPE: en_AU.UTF-8
  value of $LC_TIME: en_AU.UTF-8
  value of $LANG: en_AU.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Text

Minor modes in effect:
  shell-dirtrack-mode: t
  electric-pair-mode: t
  icomplete-vertical-mode: t
  icomplete-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-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:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny rfc822 mml mml-sec epa
derived epg rfc6068 epg-config gnus-util rmail tool-bar rmail-loaddefs
auth-source eieio eieio-core eieio-loaddefs password-cache json map
text-property-search time-date subr-x mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils thingatpt vc-git
diff-mode easy-mmode vc-dispatcher bug-reference misearch multi-isearch
cl-seq em-unix em-term term disp-table shell ehelp em-script em-prompt
em-ls em-hist em-pred em-glob em-cmpl em-dirs esh-var pcomplete comint
ansi-color ring em-basic em-banner em-alias esh-mode eshell esh-cmd
esh-ext esh-opt esh-proc esh-io esh-arg esh-module esh-groups esh-util
make-mode seq sh-script smie executable view dired-aux regexp-opt dired
dired-loaddefs term/screen term/xterm xterm byte-opt bytecomp
byte-compile cconv elec-pair display-line-numbers edmacro kmacro
modus-vivendi-theme modus-themes cl-macs gv pcase icomplete cl-loaddefs
cl-lib cus-load iso-transl tooltip eldoc paren electric uniquify
ediff-hook vc-hooks lisp-float-type elisp-mode tabulated-list replace
newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch easymenu timer select mouse jit-lock font-lock
syntax 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 emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote multi-tty
make-network-process emacs)

Memory information:
((conses 16 186497 7854)
 (symbols 48 13883 3)
 (strings 32 36546 1801)
 (string-bytes 1 1986096)
 (vectors 16 17779)
 (vector-slots 8 214105 6432)
 (floats 8 87 272)
 (intervals 56 2102 0)
 (buffers 992 31))