bug#27895: 26.0.50; display-line-numbers and header-line-format alignment

[Mark Oteiza <mvoteiza@udel.edu>]

Hi,

Enabling display-line-numbers should affect how header-line-format is
shown.

From -Q:

1. M-x global-display-line-numbers-mode RET
2. M-x ruler-mode RET

Ruler mode uses the header line to show a word-processor-like ruler.
With line numbers shown, the header line is no longer aligned to the
buffer contents.  This is also apparent in C-x C-b or tabulated-list
derived modes where the titles aren't lined up to the corresponding
columns.


In GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, Xaw scroll bars)
 of 2017-07-30 built on logos
Repository revision: d7825cb09eae438a83ed2f5b3e0715523d4ed5b7
Recent messages:
File blow-logan.2017.720p.bluray.x264.sub is large (16.6M), really open? (y or n) n
user-error: Aborted
scroll-up-command: End of buffer [2 times]
When done with this frame, type C-x 5 0
Finding changes in /home/mvo/bin/transmission/transmission.el...done
Mark set
Finding changes in /home/mvo/bin/transmission/transmission.el...done
user-error: No previous hunk
When done with this frame, type C-x 5 0
Mark set
Quit
Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --without-gconf --with-modules
 --with-x-toolkit=lucid 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe
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 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
LUCID X11 MODULES LIBSYSTEMD

Important settings:
  value of $LC_COLLATE: C
  value of $LC_CTYPE: 
  value of $LC_MESSAGES: 
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Major mode: Emacs-Lisp

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  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/mvo/.emacs.d/elpa/paredit-25beta/paredit hides /home/mvo/.emacs.d/site-lisp/paredit/paredit
/home/mvo/.emacs.d/elpa/tuareg-2.0.10/tuareg hides /home/mvo/.emacs.d/site-lisp/tuareg/tuareg
/usr/share/emacs/26.0.50/lisp/env hides /home/mvo/.emacs.d/site-lisp/google-translate/features/support/env

Features:
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vc-sccs vc-svn vc-cvs vc-rcs vc-dir ewoc vc vc-dispatcher dired
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backquote dbusbind inotify dynamic-setting system-font-setting
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Memory information:
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