bug#45474: Icomplete exhibiting in recursive minibuffer when it shouldn’t

[Gregory Heytings]

> > I'm more and more thinking that we should really bite the bullet and go 
> > for a "really buffer-local" setup, such as in the patch below.
> >
> > I'd be surprised if it doesn't introduce backward incompatibilities, 
> > but at least it's "The Right Thing" to do.
>
> Well, that's what my patch does, too, except that it delays the backward 
> incompatilibites during one Emacs major release...  (I did not include 
> minibuffer-completion-predicate and minibuffer-completion-confirm 
> because they haven't been discussed yet, but they are easy to add.)

And (to show that they are indeed easy to add) here is the updated patch, 
which also takes care of minibuffer-completion-predicate and 
minibuffer-completion-confirm.

Make-it-possible-to-disable-a-completion-backend-in-.patch
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