bug#71271: 30.0.50; M-x man does not behave nicely with C-x t t

bug#71271: 30.0.50; M-x man does not behave nicely with C-x t t

[Visuwesh]

I am not really sure how to describe this.  To reproduce:

    1. emacs -Q
    2. C-x t t M-x man ls RET

and observe the Man buffer is in fundamental-mode, then switch tabs and
observe how the *scratch* buffer is in man-mode.  This is not observed
with C-x 4 1, C-x 4 4, C-x 5 5.


In GNU Emacs 30.0.50 (build 8, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.18.0, Xaw scroll bars) of 2024-05-07 built on astatine
Repository revision: 4b31074f5f49898ba0499a2b617cad425750eafa
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Debian GNU/Linux trixie/sid

Configured using:
 'configure --with-sound=alsa --with-x-toolkit=lucid --with-json
 --without-xaw3d --without-gconf --without-libsystemd --with-cairo
 --with-xft'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM
XINPUT2 XPM LUCID ZLIB
Important settings:
  value of $LC_MONETARY: ta_IN.UTF-8
  value of $LC_NUMERIC: ta_IN.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
  TeX-PDF-mode: t
  gnus-undo-mode: t
  recentf-mode: t
  server-mode: t
  eros-mode: t
  pdf-occur-global-minor-mode: t
  minibuffer-depth-indicate-mode: t
  repeat-mode: t
  display-time-mode: t
  display-battery-mode: t
  delete-selection-mode: t
  xterm-mouse-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  use-hard-newlines: t
  tab-bar-history-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  undelete-frame-mode: t
  minibuffer-regexp-mode: t
  buffer-read-only: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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Features:
(shadow emacsbug tabify man msb bug-reference external-completion locate
calc-map calc-stat calc-vec calc-menu calc-aent avy lacarte icomplete qp
mule-util tramp-cmds tramp-sh tramp-cache tramp trampver
tramp-integration tramp-message time-stamp tramp-compat tramp-loaddefs
gnus-dired dabbrev flyspell ispell ecomplete sort gnus-cite mail-extr
textsec uni-scripts idna-mapping ucs-normalize uni-confusable
textsec-check gnus-async gnus-bcklg gnus-draft gnus-ml olivetti pdf-sync
pdf-outline pdf-links pdf-history pdf-roll math-delimiters shortdoc
comp-common preview tex-buf tex-fold font-latex tex-mode misearch
multi-isearch reveal nndraft nnmh nnmaildir nnagent nnml nnnil
gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-msg nntp
gnus-cache typo pulse color dired-aux help-fns radix-tree files-x
gnuplot-context ox-org gnuplot info-look org-plot image-file
image-converter org-ql-find org-ql-completing-read org-ql-search
org-ql-view transient ov org-super-agenda ht f s org-ql peg ts dash
org-habit org-duration latexenc oc-bibtex latex latex-flymake tex-ispell
tex-style tex crm face-remap org-pdftools pdf-annot facemenu org-noter
oc-basic embark-org ob-gnuplot ox-odt rng-loc rng-uri rng-parse
rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns nxml-enc xmltok
nxml-util ox-icalendar org-agenda ox-html ox-mathml org-latex-preview
ox-latex table ox-ascii ox-publish ox org-element org-persist avl-tree
generator ob-fortran ob-python python ob-calc calc-store calc-trail
calc-ext calc calc-loaddefs rect calc-macs ob-C cc-mode cc-fonts
cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs
ob-shell shell ob-racket async ob-async cdlatex texmathp org-attach
ol-eww eww xdg url-queue mm-url ol-rmail ol-mhe ol-irc ol-info ol-gnus
nnselect gnus-art mm-uu mml2015 mm-view mml-smime smime gnutls dig
gnus-sum shr pixel-fill kinsoku url-file svg gnus-group gnus-undo
gnus-start gnus-dbus gnus-cloud nnimap nnmail mail-source utf7 nnoo
parse-time gnus-spec gnus-int gnus-range message sendmail yank-media
puny rfc822 mml mml-sec epa 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 ol-docview doc-view ol-bibtex ol-bbdb ol-w3m ol-doi
org-link-doi org-tempo org-id org-refile org-element-ast inline ol-man
org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro org-src
sh-script smie treesit executable ob-comint org-pcomplete pcomplete
org-list org-footnote org-faces org-entities noutline outline
ob-emacs-lisp ob-core ob-eval org-cycle org-table ol org-fold
org-fold-core org-keys oc org-loaddefs org-version org-compat org-macs
cursor-sensor recentf tree-widget vc-backup log-view pcvs-util vc diff
vc-git diff-mode track-changes vc-dispatcher server paredit edmacro
kmacro eros checkdoc lisp-mnt flymake project warnings wordel-autoloads
mines-autoloads sokoban-autoloads ement-autoloads svg-lib-autoloads
taxy-magit-section-autoloads magit-section-autoloads taxy-autoloads
persist-autoloads nov-autoloads esxml-autoloads kv-autoloads
transmission-autoloads csv-mode-autoloads lua-mode-autoloads
nix-mode-autoloads gnuplot-autoloads go-mode-autoloads
racket-mode-autoloads eros-autoloads writegood-mode-autoloads embark
ffap thingatpt compat embark-autoloads siege-mode-autoloads
paredit-autoloads puni-autoloads expand-region-autoloads
filladapt-autoloads compose org-ql-autoloads transient-autoloads
peg-autoloads ov-autoloads org-super-agenda-autoloads ts-autoloads
ht-autoloads f-autoloads s-autoloads dash-autoloads scroll-other-window
org-pdftools-autoloads org-noter-autoloads change-env-autoloads
math-delimiters-autoloads doct-autoloads ob-async-autoloads
async-autoloads emacs-ob-racket-autoloads valign-autoloads
cdlatex-autoloads tempo bibtex iso8601 time-date auctex-autoloads
tex-site pdf-occur ibuf-ext ibuffer ibuffer-loaddefs tablist advice
tablist-filter semantic/wisent/comp semantic/wisent
semantic/wisent/wisent semantic/util-modes semantic/util semantic
semantic/tag semantic/lex semantic/fw mode-local cedet pdf-isearch
let-alist pdf-misc imenu pdf-tools 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 eieio eieio-core json url-vars compile comint ansi-osc
ansi-color ring cus-edit wid-edit pdf-view password-cache jka-compr
pdf-cache pdf-info tq pdf-util pdf-macs image-mode dired-x dired
dired-loaddefs exif pdf-tools-autoloads tablist-autoloads typo-autoloads
mb-depth repeat visual-fill-autoloads olivetti-autoloads time
format-spec battery filenotify dom tamil99 quail disp-table
lacarte-autoloads shell-command-plus-autoloads icons delsel xt-mouse
cus-load avy-autoloads icalendar diary-lib diary-loaddefs cal-menu
calendar cal-loaddefs plz dired-du-autoloads finder-inf filecache
easy-mmode imenu-xref-autoloads ert map byte-opt ewoc debug backtrace
find-func qrencode-autoloads derived tochemfig-autoloads
chemtable-autoloads molar-mass-autoloads vc-backup-autoloads skeleton
saveplace-pdf-view saveplace bookmark text-property-search pp
saveplace-pdf-view-autoloads dbus xml rx plz-autoloads
inspector-autoloads xr-autoloads org-mode-autoloads info
straight-autoloads cl-seq cl-extra help-mode straight subr-x cl-macs gv
cl-loaddefs cl-lib bytecomp byte-compile pcase vz-nh-theme
vz-options-theme rmc iso-transl tooltip cconv eldoc paren electric
uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/x-win x-win term/common-win x-dnd touch-screen 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 lcms2
dynamic-setting system-font-setting font-render-setting cairo x-toolkit
xinput2 x multi-tty move-toolbar make-network-process emacs)

Memory information:
((conses 16 1466944 225911) (symbols 48 68166 153)
 (strings 32 393250 20352) (string-bytes 1 21351885)
 (vectors 16 162451) (vector-slots 8 2420158 139093)
 (floats 8 16076 12553) (intervals 56 33892 2348) (buffers 984 61))

bug#71271: 30.0.50; M-x man does not behave nicely with C-x t t

[Juri Linkov]

close 71271 30.0.50
thanks

> I am not really sure how to describe this.  To reproduce:
>
>     1. emacs -Q
>     2. C-x t t M-x man ls RET
>
> and observe the Man buffer is in fundamental-mode, then switch tabs and
> observe how the *scratch* buffer is in man-mode.  This is not observed
> with C-x 4 1, C-x 4 4, C-x 5 5.

Thanks for the clear case, so this is fixed now.