I am hoping to see,

* `package-menu-filter-unused` - similar to
`package-menu-filter-upgradable`, but filter/list unused packages instead
* `package-menu-mark-unused` -  similar to `package-menu-mark-upgrades`,
but mark unused packages instead

I know there is `package-autoremove`, but I think sometimes it's good to
see the packages in the menu. Would these be good features?


In GNU Emacs 29.0.50 (build 3, x86_64-w64-mingw32)
 of 2022-07-19 built on AVALON
Repository revision: 7a937167030d44341409b3a2ac7ff1704142a191
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 10.0.19044
System Description: Microsoft Windows 10 Pro (v10.0.2009.19044.1889)

Configured using:
 'configure --without-dbus --with-native-compilation
 --without-compress-install -C 'CFLAGS=-O2 -g3''

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP XPM ZLIB

(NATIVE_COMP present but libgccjit not available)

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

Major mode: Dashboard

Minor modes in effect:
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Load-path shadows:
c:/Users/JenChieh/AppData/Roaming/.emacs.d/elpa/ada-mode-7.2.1/gnat-core
hides c:/Users/JenChieh/AppData/Roaming/.emacs.d/elpa/wisi-3.1.8/gnat-core
c:/Users/JenChieh/AppData/Roaming/.emacs.d/elpa/transient-20220806.2224/transient
hides c:/Program
Files/Emacs/emacs-29.0.50-snapshot/share/emacs/29.0.50/lisp/transient
~/.emacs.d/site-lisp/custom hides c:/Program
Files/Emacs/emacs-29.0.50-snapshot/share/emacs/29.0.50/lisp/custom

Features:
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time-date mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
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company-box-doc face-remap company-box-util frame-local
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vc vc-dispatcher f f-shortdoc shortdoc text-property-search dash s
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hashtable-print-readable backquote threads w32notify w32 lcms2 multi-tty
make-network-process native-compile emacs)

Memory information:
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 (strings 32 72910 62839)
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 (vectors 16 37362)
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