bug#46299: 28.0.50; Value of tab-bar-show not respected in new frames.

[Bastian Beischer]

I noticed that with the latest master branch setting tab-bar-show
to "1" does not work work for new frames. On those the tabs are shown
even if tab-bar-show is set to 1. I suppose a hook is needed which
applies the correct setting to the new frame?

This can be reproduced by:

1) "emacs -Q"
   (no tab bar yet)

2) M-x tab-bar-mode
   (tab bar appears in the current frame with one tab)

3) M-x customize-variable tab-bar-show ->
   Set to "When more than one tab".
   (tab bar disappears in the current frame)

4) C-x 5 2
   (tab bar visible in the new frame with one tab)


In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24)
 of 2021-02-03 built on bastian-desktop
Repository revision: 20e48b6fd6cade60e468140a66127d326abfb8ff
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
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
 --enable-link-time-optimization --with-x-toolkit=gtk3 --without-xaw3d
 --without-cairo --without-compress-install 'CFLAGS=-march=native -O2
 -pipe -fno-plt -flto -fuse-linker-plugin -flto -fuse-linker-plugin'
 CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

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

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

Major mode: Lisp Interaction

Minor modes in effect:
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  helm-fuzzier-mode: t
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  projectile-mode: t
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  global-git-commit-mode: t
  magit-auto-revert-mode: t
  flx-ido-mode: t
  ido-everywhere: t
  shell-dirtrack-mode: t
  show-paren-mode: t
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  global-eldoc-mode: t
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  mouse-wheel-mode: t
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  auto-encryption-mode: t
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  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  hs-minor-mode: t

Load-path shadows:
/home/beischer/.emacs.d/elpa/cmake-mode-20210104.1831/cmake-mode hides 
/usr/share/emacs/site-lisp/cmake-mode
~/.emacs.d/lisp/buff-menu+ hides /usr/share/emacs/site-lisp/various/buff-menu+
~/.emacs.d/lisp/my-term hides /usr/share/emacs/site-lisp/various/my-term
~/.emacs.d/lisp/buff-menu hides /usr/share/emacs/site-lisp/various/buff-menu
~/.emacs.d/lisp/qt-pro hides /usr/share/emacs/site-lisp/various/qt-pro
~/.emacs.d/lisp/buff-menu hides /usr/share/emacs/28.0.50/lisp/buff-menu

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