Package: Emacs
Version: 30.0.50


With packages being available both as bundled with Emacs and as ELPA
packages, it has become a lot more common place to have two versions of
a package in the `load-path` and to have to deal with situations
where the "incorrect" version has been loaded before `load-path`
was changed.

These kinds of problems manifest in various ways and we try to
circumvent them in `package.el` in some cases but that can't cover
all cases.

I suggest we introduce a new function to help packages susceptible to
those problems.  The patch below introduces a new function which
I tentatively called `require-with-check` and shows how it could be used
in the case of `eglot.el` (which relies on several core packages also
distributed via GNU ELPA and currently uses a hack which slows it down
unnecessarily in the normal case).

As mentioned in a FIXME in there, maybe we should also consider
adding to `seq` (and `eldoc`) something like

    ;;;###autoload
    (if (featurep 'seq) (require-with-check 'seq 'reload))


-- Stefan