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

[Juri Linkov]

> 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.

I've tested your new patch with tests that Gregory posted
in an earlier message that cover all cases of nested
completion and non-completion minibuffers:

  M-:       C-x C-f
  C-x C-f   M-:
  C-x C-f   C-x 8 RET
  M-:       C-x f

with

  (icomplete-mode 1)
  (setq icomplete-show-matches-on-no-input t
        enable-recursive-minibuffers t)

and everything works fine without problems.  Of course, this doesn't mean
that some corner cases still exist.  But I don't know a better way
to find out than to install it and wait for bug reports.