bug#57503: 28.1.91; package-selected-packages should not be saved to custom-file

[Joost Kremers <joostkremers@fastmail.fm>]

The variable `package-selected-packages` should not be saved to the users init
file (or whatever `custom-file` points to). This was discussed before on
emacs-devel but wasn't resolved:

<https://lists.gnu.org/archive/html/emacs-devel/2016-02/msg00958.html> but 

The gist of it is that if you keep your configuration under version control,
having package-selected-packages written to your config file is inconvenient if
you share your config across multiple machines but do not want to have the exact
same set of packages installed on each.

Even if you do want to keep the exact same set of packages on each machine, you
still need to be careful about installing them, because the order of package
installation affects the order of package-selected-packages, and so does
deleting and reinstalling a package. As a result, I often experienced
meaningless VC conflicts that needed to be resolved.

IMHO the value of package-selected-packages should be written to a separate
file, so that it's possible to put it under version control or ignore it,
independently from the rest of one's configuration.


In GNU Emacs 28.1.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0)
 of 2022-08-03 built on Lenovo
Repository revision: f23d45603918721ec80bfcef883d22fab15cb9f1
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-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
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: mu4e:main

Minor modes in effect:
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  mu4e-search-minor-mode: t
  mu4e-update-minor-mode: t
  mu4e-context-minor-mode: t
  minions-mode: t
  doom-modeline-mode: t
  which-key-mode: t
  global-atomic-chrome-edit-mode: t
  marginalia-mode: t
  all-the-icons-completion-mode: t
  company-prescient-mode: t
  prescient-persist-mode: t
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  vertico-mode: t
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  csv-field-index-mode: t
  shell-dirtrack-mode: t
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  delete-selection-mode: t
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  tooltip-mode: t
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  show-paren-mode: t
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  tool-bar-mode: t
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  file-name-shadow-mode: t
  global-font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  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
  overwrite-mode: overwrite-mode-binary

Load-path shadows:
~/.emacs.d/lisp/custom hides /usr/local/share/emacs/28.1.91/lisp/custom
/home/joost/.emacs.d/elpa/transient-20220806.2224/transient hides /usr/local/share/emacs/28.1.91/lisp/transient

Features:
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Memory information:
((conses 16 848943 78066)
 (symbols 48 64672 39)
 (strings 32 228119 24655)
 (string-bytes 1 8079504)
 (vectors 16 112770)
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-- 
Joost Kremers
Life has its moments