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

[Gregory Heytings]

> > >    run_hook (Qminibuffer_setup_hook);
> >
> > As in my patch, you could use this hook to do the completion-specific 
> > part of the setup.
>
> Indeed, but you said that 'minibuffer-with-setup-hook' is "fundamentally 
> broken and messy"...

I forgot to add that if the idea is to change the semantics of 
read-from-minibuffer in the long-term, this must happen inside 
read-from-minibuffer, not with a minibuffer-with-setup-hook around 
read-from-minibuffer.  What would be possible here (I think) is to move 
this piece of code in a minibuffer-with-setup-hook inside the 
read-from-minibuffer macro.