bug#47388: 27.1; eldoc-documentation-function is ignore in updated eldoc

[Basil L. Contovounesios]

Alex Branham <alex.branham@gmail.com> writes:

> Emacs 27.1 ships with eldoc that defines eldoc-documentation-function as
> #'ignore. If users install eglot from ELPA, this pulls in an updated
> eldoc that attempts to redefine eldoc-documentation-function. However,
> the value does not change (since eldoc-documentation-function is already
> bound, defcustom does not update it when called in
> eldoc--documentation-strategy-defcustom) so the value is still ignore,
> meaning users get:
>
>     There is no ElDoc support in this buffer
>
> since eldoc-documentation-function is #'ignore, regardless of the value
> of eldoc-documentation-functions.
>
> Here's the bug report we received with the original issue:
> https://github.com/emacs-ess/ESS/issues/1130

Thanks, CCing João.

-- 
Basil