bug#63825: 29.0.90; The header line should be hidden when empty

[Spencer Baugh]

It would be nice if the header line was hidden when it was empty, not
just when header-line-format was nil.  That reduces a bit of visual
noise and gives one more line of text in some buffers.

A concrete use case is with which-func-mode:

1. emacs -Q
2. (setq-default header-line-format
     '((which-func-mode ("" which-func-format " "))))
3. This nicely adds the current function name to the header in code
buffers, but in buffers not supported by which-function-mode (text-mode,
for example) the header line is empty and ugly.

The header-line is rendered by display_mode_line, so we could probably
do this there, wrapping a check around the output from
Fformat_mode_Line.  Then the mode-line would also be hidden if it's
empty, which would also be useful although much more niche.


In GNU Emacs 29.0.90 (build 3, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.15.12, Xaw scroll bars) of 2023-05-17 built on
 igm-qws-u22796a
Repository revision: 4d08492296c2a6d2910f2b740c2d2508275458fc
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: CentOS Linux 7 (Core)

Configured using:
 'configure --with-x-toolkit=lucid --with-gif=ifavailable'

Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND
SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XINPUT2 XPM LUCID
ZLIB

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

Major mode: ELisp/d

Minor modes in effect:
  jane-fe-minor-mode: t
  editorconfig-mode: t
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  global-git-commit-mode: t
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/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/org-lint
/home/sbaugh/src/emacs/emacs-29/lisp/org/org-agenda hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/org-agenda
/home/sbaugh/src/emacs/emacs-29/lisp/org/org-macro hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/org-macro
/home/sbaugh/src/emacs/emacs-29/lisp/org/org-attach-git hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/org-attach-git
/home/sbaugh/src/emacs/emacs-29/lisp/org/ob-processing hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/ob-processing
/home/sbaugh/src/emacs/emacs-29/lisp/org/ob-css hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/ob-css
/home/sbaugh/src/emacs/emacs-29/lisp/org/ob-dot hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/ob-dot
/home/sbaugh/src/emacs/emacs-29/lisp/org/org-list hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/org-list
/home/sbaugh/src/emacs/emacs-29/lisp/org/org-macs hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/org-macs
/home/sbaugh/src/emacs/emacs-29/lisp/org/org-attach hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/org-attach
/home/sbaugh/src/emacs/emacs-29/lisp/org/org-archive hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/org-archive
/home/sbaugh/src/emacs/emacs-29/lisp/org/ob-python hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/ob-python
/home/sbaugh/src/emacs/emacs-29/lisp/org/ob-plantuml hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/ob-plantuml
/home/sbaugh/src/emacs/emacs-29/lisp/org/ob-ditaa hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/lisp/ob-ditaa
/home/sbaugh/src/emacs/emacs-29/lisp/org/ob-julia hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/contrib/lisp/ob-julia
/home/sbaugh/src/emacs/emacs-29/lisp/org/ol-man hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/contrib/lisp/ol-man
/home/sbaugh/src/emacs/emacs-29/lisp/org/ox-koma-letter hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/org/contrib/lisp/ox-koma-letter
/home/sbaugh/.emacs.d/elpa/dash-2.19.1/dash hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/dash/dash
/home/sbaugh/.emacs.d/elpa/dash-2.19.1/dash-functional hides 
/usr/local/home/sbaugh/workspaces/fe-47828/+share+/app/emacs/elisp/contrib/dash/dash-functional

Features:
(shadow mail-extr emacsbug dabbrev dos-w32 find-cmd tutorial man sort
conf-mode make-mode mule-util completion descr-text cus-start quail
shortdoc cal-iso org-datetree tabify org-capture org-element org-persist
org-id org-refile avl-tree generator oc-basic 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 ol-docview doc-view jka-compr
image-mode exif ol-bibtex bibtex ol-bbdb ol-w3m ol-doi org-link-doi misc
pulse find-dired bug-reference magit-imenu git-rebase face-remap vc-bzr
vc-src vc-sccs vc-svn vc-cvs vc-rcs log-view vc-git cl-print dired-aux
help-fns radix-tree misearch multi-isearch vc-fe sh-script treesit
executable goto-addr cus-edit cus-load vc-hg vc-dir vc vc-dispatcher
tramp tramp-cache time-stamp tramp-loaddefs trampver tramp-integration
tramp-compat ls-lisp ffap jane-merlin merlin-imenu merlin-xref
merlin-cap merlin jane-async-merlin jane-completion grep jane-common
jane-fe-project xref jane-fe-menu ecaml_plugin linum view gopcaml
magit-bookmark bookmark image+ advice image-file image-converter
editorconfig editorconfig-core editorconfig-core-handle
editorconfig-fnmatch whitespace jane-auto-modes vba-mode markdown-mode
color jane jane-micro-features jane-diff unified-test-mode shell-file
core core-buffer core-error core-util ert pp ewoc debug backtrace
jane-sexp jane-ocaml jane-tuareg-theme tuareg tuareg-compat tuareg-opam
skeleton flymake-proc flymake warnings thingatpt smie caml-types
caml-help caml-emacs find-file compile jane-cr jane-align
jane-deprecated jane-smerge gnu-elpa-keyring-update jane-ocp-indent
ocp-indent cl jane-util ob-shell page-ext dired-x magit-extras project
magit-submodule magit-obsolete magit-blame magit-stash magit-reflog
magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote
magit-commit magit-sequence magit-notes magit-worktree magit-tag
magit-merge magit-branch magit-reset magit-files magit-refs magit-status
magit magit-repos magit-apply magit-wip magit-log which-func imenu
magit-diff smerge-mode diff diff-mode git-commit log-edit pcvs-util
add-log magit-core magit-autorevert autorevert filenotify magit-margin
magit-transient magit-process with-editor shell server magit-mode
transient edmacro kmacro magit-git magit-section magit-utils crm dash
cl-extra help-mode windmove org ob ob-tangle ob-ref ob-lob ob-table
ob-exp org-macro org-src ob-comint org-pcomplete pcomplete org-list
org-footnote org-faces org-entities noutline outline icons ob-emacs-lisp
ob-core ob-eval org-cycle org-table ol rx org-fold org-fold-core
org-keys oc org-loaddefs find-func cal-menu calendar cal-loaddefs
gnus-sum shr pixel-fill kinsoku url-file svg dom gnus-group gnus-undo
gnus-start gnus-dbus dbus xml gnus-cloud nnimap nnmail mail-source utf7
nnoo parse-time iso8601 gnus-spec gnus-int gnus-range message sendmail
yank-media puny dired dired-loaddefs 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 text-property-search time-date mail-utils range
mm-util mail-prsvr wid-edit org-version org-compat org-macs format-spec
gdb-mi bindat gud comint easy-mmode files-x derived ansi-osc ansi-color
ring vundo pcase cyberpunk-theme savehist saveplace project-autoloads
vundo-autoloads magit-autoloads xref-autoloads csv-mode-autoloads
magit-section-autoloads cyberpunk-theme-autoloads
url-http-ntlm-autoloads url-auth git-commit-autoloads
with-editor-autoloads finder-inf info dash-autoloads vc-hgcmd-autoloads
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 cl-seq eieio eieio-core cl-macs
password-cache json subr-x map byte-opt gv bytecomp byte-compile
url-vars cl-loaddefs cl-lib 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 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
dynamic-setting system-font-setting font-render-setting cairo x-toolkit
xinput2 x multi-tty make-network-process emacs)

Memory information:
((conses 16 1000624 218672)
 (symbols 48 60965 4)
 (strings 32 241531 19923)
 (string-bytes 1 8575945)
 (vectors 16 79618)
 (vector-slots 8 2128035 219488)
 (floats 8 587 496)
 (intervals 56 48581 359)
 (buffers 976 96)
 (heap 1024 603394 253119))