bug#21252: 25.0.50; `describe-variable': use current buffer, not minibuffer, in `completing-read' PREDICATE

[Lars Ingebrigtsen]

Drew Adams <drew.adams@oracle.com> writes:

> This bug is at least as old as Emacs 20!  Never noticed it before.
>
> 1. emacs -Q
> 2. Type this in *scratch* and evaluate it using `C-x C-e':
>
>    (set (make-local-variable 'toto) 42)
>
> 3. C-h v tot TAB
>
> There is no completion for variable `toto'.
>
> The reason is that the PREDICATE arg passed to `completing-read' gets
> evaluated with the minibuffer as the current buffer, and `toto' is not
> bound in the minibuffer.
>
> The predicate should use `with-current-buffer' to make the originally
> current buffer current for the test.

Makes sense.  I applied your changes, slightly changed.

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