bug#65475: 29.1; package-selected-packages variable is not updated when the last package is deleted

[Stefan Kangas]

Philip Kaludercic <philipk@posteo.net> writes:

>> If we really can't find a better option, we need to add a bunch of
>> comments explaining why we ended up with such a hack.
>
> It seems that it is only necessary to bind `package-alist' during the
> invocation of `package--used-elsewhere-p', so this is a more
> conservative proposal:

Any chance we could add a unit test for this?  It's been a while since I
last looked at package-tests.el.

Other than that, LGTM.