bug#52785: 29.0.50; user-full-name: "Chop off everything after the first comma"

[Sam Steingold]

Hi, 

Since at least 1996-12-08 (3415b0e9d2a), user-full-name has had the
following code:

--8<---------------cut here---------------start------------->8---
  /* Chop off everything after the first comma. */
  q = strchr (p, ',');
  full = make_string (p, q ? q - p : strlen (p));
--8<---------------cut here---------------end--------------->8---

The result is that when full name is specified in the system as
"Steingold, Sam", `user-full-name' returns "Steingold".

Are we really sure that this is still the intended behavior?
If yes, we might want to document it in the doc string and info.

Thank you.


In GNU Emacs 29.0.50 (build 4, x86_64-apple-darwin20.6.0, NS appkit-2022.60 
Version 11.6.2 (Build 20G314))
 of 2021-12-20 built on 3c22fb11fdab.ant.amazon.com
Repository revision: 92ffe44834b8f77ee3f4d37edfdb19f30a376869
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2022
System Description:  macOS 11.6.2

Configured using:
 'configure --with-imagemagick --with-mailutils --with-ns
 
PKG_CONFIG_PATH=/usr/local/opt/libxml2/lib/pkgconfig:/usr/local/opt/imagemagick/lib/pkgconfig:/usr/local/opt/gnutls/lib/pkgconfig:/usr/local/opt/jansson/lib/pkgconfig:/usr/local/opt/libtiff/lib/pkgconfig:/usr/local/opt/libpng/lib/pkgconfig:/usr/local/opt/libjpeg/lib/pkgconfig:/usr/local/opt/freetype/lib/pkgconfig'

Configured features:
ACL GIF GMP GNUTLS IMAGEMAGICK JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY
KQUEUE NS PDUMPER PNG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP ZLIB

Important settings:
  value of $LANG: C
  locale-coding-system: utf-8-unix

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.2022
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
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