bug#55387: 28.1.50; csv-mode: header does not align when line numbers are displayed

[Joost Kremers]

`csv-mode` has the option to display a header line so you can make column names 
permanently visible, which is a very nice option. However, when 
`display-line-numbers-mode` is active, the column names do not line up with the 
actual columns, because the header line does not take into account the space 
taken up by the line numbers.

I posted this on emacs-devel:
<https://lists.gnu.org/archive/html/emacs-devel/2022-04/msg01308.html>

Eli Zaretskii suggested this can be fixed by doing something similar to what
tabulated-list-mode does. I'm not sure I'll find time to dive into that any time
soon, so I'm posting here to make sure the issue isn't forgotten.

Joost




In GNU Emacs 28.1.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo 
version 1.16.0)
 of 2022-04-04 built on Lenovo
Repository revision: dd3863d8bcc77c43363bbd041da1c1eb37a3ee32
Repository branch: emacs-28
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: elementary OS 6.1 Jólnir

Configured using:
 'configure --with-harfbuzz --with-cairo --with-json --with-libgmp
 --with-native-compilation'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE
XIM XPM GTK3 ZLIB
Important settings:
  value of $LC_MONETARY: en_IE.UTF-8
  value of $LC_NUMERIC: en_IE.UTF-8
  value of $LC_TIME: en_IE.UTF-8
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  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: VTerm

Minor modes in effect:
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  auto-composition-mode: t
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  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-save-visited-mode: t

Load-path shadows:
~/.emacs.d/lisp/custom hides /usr/local/share/emacs/28.1.50/lisp/custom
/home/joost/.emacs.d/elpa/transient-20220509.1943/transient hides 
/usr/local/share/emacs/28.1.50/lisp/transient

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Memory information:
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-- 
Joost Kremers
Life has its moments