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

[Lars Ingebrigtsen]

Robert Pluim <rpluim@gmail.com> writes:

> How do we define 'fresher'?

I left that as an exercise for the reader.  🫠  

>  Anyway, if in doubt, use brute force:
>
> (define-multisession-variable package-selected-packages-ms
>                               (package--find-non-dependencies))
>
> works fine. We could even condition it on `package-selected-packages'
> being non-nil.

Hm...  I wonder whether we could just drop the variable altogether.
That is, checking for freshness sounds like as much work as
recalculating the variable.

What are the actual effects of the variable?  That is, what code is it
supposed to speed up?