bug#47456: 27.1; emacs hangs using aspell in auctex

[Brian Elmegaard via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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In Emacs 27.1 on Windows with auctex 13.0.4, I have installed aspell as described in
https://emacs.stackexchange.com/a/45752 and it works, except
in .tex files.

When I M-x ispell-buffer emacs hangs after a few moments and it doesn't
become active before I press C-g and skips the spelling.
The same happens for flyspell.

It seems to work if line 4084 of ispell.el is commented:
      ;;     (ispell-send-string "+\n")    ; set ispell mode to tex


In GNU Emacs 27.1 (build 1, x86_64-w64-mingw32)
of 2020-08-21 built on CIRROCUMULUS
Repository revision: 86d8d76aa36037184db0b2897c434cdaab1a9ae8
Repository branch: HEAD
Windowing system distributor 'Microsoft Corp.', version 10.0.17134
System Description: Microsoft Windows 10 Enterprise (v10.0.1803.17134.2087)

Recent messages:
Auto-saving...
Sending...
Sending via mail...
Save this mail sending choice? (y or n) y
Saving file c:/Users/brel/AppData/Roaming/.emacs...
Wrote c:/Users/brel/AppData/Roaming/.emacs
Sending...done
Undo [14 times]
user-error: No further undo information
apply: Command attempted to use minibuffer while in minibuffer

Configured using:
'configure --without-dbus --host=x86_64-w64-mingw32
--without-compress-install 'CFLAGS=-O2 -static''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY W32NOTIFY ACL GNUTLS LIBXML2
HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS JSON PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: DAN
  locale-coding-system: cp1252

Major mode: BibTeX

Minor modes in effect:
  shell-dirtrack-mode: t
  save-place-mode: t
  delete-selection-mode: t
  show-paren-mode: t
  recentf-mode: t
  global-auto-revert-mode: t
  cua-mode: t
  TeX-PDF-mode: t
  TeX-source-correlate-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-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
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shell pcomplete cus-edit mailalias mailclient qp ispell latex
easy-mmode edmacro kmacro latex-flymake flymake-proc flymake compile
comint ansi-color ring warnings thingatpt tex-ispell tex-style bibtex
help-mode pp shadow sort mail-extr emacsbug message rmc puny dired
dired-loaddefs format-spec rfc822 mml mml-sec epa derived epg epg-config
gnus-util rmail rmail-loaddefs text-property-search time-date mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
saveplace delsel paren recentf tree-widget wid-edit autorevert
filenotify cua-base cus-start cus-load server tex-mik tex crm advice
texmathp finder-inf info tex-site 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 dos-w32 ls-lisp
disp-table term/w32-win w32-win w32-vars term/common-win 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 w32notify w32
lcms2 multi-tty make-network-process emacs)

Memory information:
((conses 16 157647 22674)
(symbols 48 14604 1)
(strings 32 48447 2455)
(string-bytes 1 1396927)
(vectors 16 27704)
(vector-slots 8 1010205 201054)
(floats 8 53 204)
(intervals 56 928 11)
(buffers 1000 16))

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