>>>>> On Fri, 02 Sep 2022 15:17:55 +0200, Lars Ingebrigtsen <larsi@gnus.org> said:

    Lars> Philip Kaludercic <philipk@posteo.net> writes:
    >> How about writing it into a file like
    >> "~/.config/emacs/elpa/selected-packages"?

    Lars> The defcustom could just be changed to a define-multisession-variable.

For values of 'just' that are a little bigger than changing that one
line 😀

roughʼnʼready patch attached. Seems to work fine. Iʼve not tested the
interaction with a .emacs that has package-selected-packages set, but
if I understand multisession variables correctly that will just be
ignored.