bug#55075: 29.0.50; vtable: Option to not draw the header line at all

[Visuwesh]

Hello Lars,

Thanks for the vtable library.  It is really handy.  I have one minor
feature request that would apply when using this library to insert
aligned rows of text without any specific column names i.e.,

    (with-current-buffer (get-buffer-create "*vtable*")
      (erase-buffer)
      (make-vtable
       :objects '(("Foo" "Bar")
                  ("Bar" "What"))
       :use-header-line nil)
      (view-buffer (current-buffer)))    

In this example, it would be nice if vtable did not draw an empty column
line when :use-header-line and :columns are nil, which would let the
library users to draw rows of aligned texts without resorting to a
workaround that sets header-line-format to nil afterwards.

P.S. shouldn't the default :face be variable-pitch-text instead?

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo version 
1.16.0, Xaw scroll bars)
Repository revision: ca3858563c7ba8ee3caa82fbd2b7c386ea60c0d3
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: NixOS 21.11 (Porcupine)

Configured using:
 'configure
 --prefix=/nix/store/iqqk7iqfwmfc6r78xg2knyq7hww2mhs4-emacs-git-20220225.0
 --disable-build-details --with-modules --with-x-toolkit=lucid
 --with-xft --with-cairo --with-native-compilation'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM LUCID ZLIB

Important settings:
  value of $EMACSLOADPATH: 
  value of $EMACSNATIVELOADPATH: 
/nix/store/5gh4w50dhchhcyjm6ysh17h7y4i5vasf-emacs-packages-deps/share/emacs/native-lisp::
  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: Lisp Interaction

Minor modes in effect:
  vtable-header-mode: t
  semantic-minor-modes-format: ((:eval (if (or semantic-highlight-edits-mode 
semantic-show-unmatched-syntax-mode)  S)))
  shell-dirtrack-mode: t
  recentf-mode: t
  paredit-mode: t
  eros-mode: t
  flymake-mode: t
  hl-todo-mode: t
  pdf-occur-global-minor-mode: t
  minibuffer-depth-indicate-mode: t
  repeat-mode: t
  display-time-mode: t
  display-battery-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  undelete-frame-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/viz/.nix-profile/share/emacs/site-lisp/site-start hides 
/nix/store/5gh4w50dhchhcyjm6ysh17h7y4i5vasf-emacs-packages-deps/share/emacs/site-lisp/site-start
/home/viz/lib/emacs/straight/build/map/map hides 
/nix/store/iqqk7iqfwmfc6r78xg2knyq7hww2mhs4-emacs-git-20220225.0/share/emacs/29.0.50/lisp/emacs-lisp/map
/home/viz/lib/emacs/straight/build/let-alist/let-alist hides 
/nix/store/iqqk7iqfwmfc6r78xg2knyq7hww2mhs4-emacs-git-20220225.0/share/emacs/29.0.50/lisp/emacs-lisp/let-alist

Features:
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byte-compile cconv iso-transl tooltip eldoc paren electric uniquify
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term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
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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 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 emoji-zwj 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 keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo x-toolkit
x multi-tty make-network-process native-compile emacs)

Memory information:
((conses 16 1656154 637310)
 (symbols 48 61590 132)
 (strings 32 325699 16913)
 (string-bytes 1 301230391)
 (vectors 16 129513)
 (vector-slots 8 3279364 421530)
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 (buffers 992 122))