bug#47234: 28.0.50; frame-inner-height fails without window system on tab-bar-height

[Basil L. Contovounesios]

X-Debbugs-Cc: Juri Linkov <juri@linkov.net>, Martin Rudalics <rudalics@gmx.at>

In a build --without-x:

0. ./src/emacs -Q
1. (frame-inner-height) C-j

  Debugger entered--Lisp error: (void-function tab-bar-height)
    tab-bar-height(#<frame F1 0x55aeb85320a0> t)
    frame-inner-height()
    (progn (frame-inner-height))
    eval((progn (frame-inner-height)) t)
    elisp--eval-last-sexp(t)
    eval-last-sexp(t)
    eval-print-last-sexp(nil)
    funcall-interactively(eval-print-last-sexp nil)
    call-interactively(eval-print-last-sexp nil nil)
    command-execute(eval-print-last-sexp)

The obvious band-aid is to check (fboundp 'tab-bar-height) in
frame-inner-height, but shouldn't we count 1 line when tab-bar-mode is
enabled even --without-x?  IOW, can/should tab-bar-height or similar be
defined regardless of HAVE_WINDOW_SYSTEM?  What's TRT here?

Thanks,

-- 
Basil

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu)
 of 2021-03-18 built on tia
Repository revision: ce1b4acd71e962b6a72a779ee04cb5aeb6ceb6f2
Repository branch: master
System Description: Debian GNU/Linux bullseye/sid

Configured using:
 'configure 'CC=ccache gcc' 'CFLAGS=-O2 -march=native' --config-cache
 --prefix=/home/blc/.local --program-suffix=-nox
 --enable-checking=structs --with-file-notification=yes
 --with-x-toolkit=no --without-x'

Configured features:
ACL DBUS GMP GNUTLS GPM JSON LCMS2 LIBSELINUX LIBSYSTEMD LIBXML2 MODULES
NOTIFY INOTIFY PDUMPER SOUND THREADS XIM ZLIB

Important settings:
  value of $LANG: en_IE.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Debugger

Minor modes in effect:
  mouse-wheel-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  menu-bar-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

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
rfc822 mml mml-sec epa derived epg epg-config gnus-util rmail
rmail-loaddefs auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json map text-property-search time-date
subr-x seq mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils help-fns radix-tree cl-print debug backtrace
help-mode tool-bar find-func cl-loaddefs cl-lib term/xterm xterm
byte-opt gv bytecomp byte-compile cconv regexp-opt mwheel iso-transl
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
tabulated-list replace newcomment text-mode elisp-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 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 threads dbusbind inotify lcms2 multi-tty make-network-process
emacs)