bug#48925: [PATCH] Set `minibuffer-completion-*` variables buffer-locally in a few more places

[Stefan Monnier]

> This follows up on changes proposed in bug#45474.

Thanks, the first patch looks good to me (assuming it works ;-).

> The second patch is a bit more controversial, but is probably required
> if we want more reliable usage of completion commands in non-innermost
> minibuffers (that is, with minibuffer-follows-selected-frame set
> to nil.)

The patch is fundamentally right, but as you say it's a bit more
controversial because it risks exposing bugs.  Hmm...

To be on the safer side, I guess we could replace the

    specbind (Qminibuffer_completion_table, Qnil);

with a use of `minibuffer-with-setup-hook` that sets the var to nil in
the new minibuffer.  But doing it in C is awkward so it would best be
done by moving the function to subr.el.


        Stefan