bug#43007: 27.1; M-j doesn't behave properly in comments

[Alessio Vanni]

I normally use M-j to continue a long comment over multiple lines.
Recently, this feature broke in a rather weird way: new lines are opened
as a comment, but the new line is placed above the line with the point,
rather than below.  In some other cases, the line appears in the correct
place, but opening a new line results in a '*' character instead of a
comment (the character is used on modes where '*' is part of a comment,
like `js-mode' or `cc-mode'.)

This happens when running "emacs -Q" too.

Example:

// some comment.

Becomes:

//
// some comment.

Alternatively:

// some comment.
//
//
  *
  *
  *
  *

(the '*' just keeps happening for every M-j.)

In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, cairo version 1.16.0)
 of 2020-08-12 built on localhost
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Gentoo/Linux

Configured using:
 'configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --disable-silent-rules
 --docdir=/usr/share/doc/emacs-27.1
 --htmldir=/usr/share/doc/emacs-27.1/html --libdir=/usr/lib64
 --program-suffix=-emacs-27 --includedir=/usr/include/emacs-27
 --infodir=/usr/share/info/emacs-27 --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --without-compress-install --without-hesiod --without-pop
 --with-dumping=pdumper --with-file-notification=no --enable-acl
 --without-dbus --with-modules --without-gameuser --with-libgmp
 --without-gpm --with-json --without-kerberos --without-kerberos5
 --with-lcms2 --with-xml2 --with-mailutils --without-selinux
 --with-gnutls --without-libsystemd --with-threads --without-wide-int
 --with-zlib --with-sound=alsa --with-x --without-ns --without-gconf
 --without-gsettings --without-toolkit-scroll-bars --with-gif
 --with-jpeg --with-png --with-rsvg --without-tiff --with-xpm
 --without-imagemagick --with-xft --with-cairo --with-harfbuzz
 --with-libotf --with-m17n-flt --with-x-toolkit=no 'CFLAGS=-O2 -pipe
 -march=native' CPPFLAGS= 'LDFLAGS=-Wl,-O1 -Wl,--as-needed''

Configured features:
XPM JPEG GIF PNG RSVG CAIRO SOUND GLIB ACL GNUTLS LIBXML2 FREETYPE
HARFBUZZ M17N_FLT LIBOTF ZLIB OLDXMENU X11 XDBE XIM MODULES THREADS JSON
PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: EXWM

Minor modes in effect:
  global-magit-file-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  display-time-mode: t
  global-page-break-lines-mode: t
  global-column-enforce-mode: t
  auto-insert-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-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
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

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mail-utils mule-util gnutls network-stream url-http mail-parse rfc2231
rfc2047 rfc2045 mm-util ietf-drums mail-prsvr url-gw nsm rmc puny
url-cache url-auth url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf url-util mailcap epg epg-config
finder-inf disp-table cl-extra help-mode time php-mode advice mode-local
find-func imenu speedbar sb-image ezimage dframe etags fileloop
generator xref project cc-langs cc-mode cc-fonts cc-guess cc-menus
cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs php-face php rx
php-project flymake-proc flymake compile comint ansi-color ring warnings
thingatpt droid droid-emulator droid-project droid-files droid-custom
javadoc-lookup ido page-break-lines column-enforce-mode autoinsert
exwm-edit exwm-systemtray xcb-systemtray xcb-xembed edmacro exwm
exwm-input xcb-keysyms xcb-xkb exwm-manage exwm-floating xcb-cursor
xcb-render exwm-layout exwm-workspace exwm-core xcb-ewmh xcb-icccm xcb
xcb-xproto xcb-types xcb-debug kmacro server misc-functions 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 lcms2
dynamic-setting font-render-setting cairo x multi-tty
make-network-process emacs)

Memory information:
((conses 16 1551533 207817)
 (symbols 48 43892 517)
 (strings 32 271136 30525)
 (string-bytes 1 9032648)
 (vectors 16 98751)
 (vector-slots 8 2039028 250744)
 (floats 8 368 343)
 (intervals 56 172593 0)
 (buffers 1000 23))