bug#47127: 27.1; ido file completion sorting should respect ido-case-fold, maybe?

[Lars Ingebrigtsen <larsi@gnus.org>]

"Ryan C. Thompson" <rct@thompsonclan.org> writes:

> ;; Returns nil, as expected
> (let ((ido-case-fold nil))
>   (ido-file-lessp "a" "B"))
>
> ;; Should return t, but currently returns nil
> (let ((ido-case-fold t))
>   (ido-file-lessp "a" "B"))
>
> ;; Should still return t because case is the only difference
> (let ((ido-case-fold t))
>   (ido-file-lessp "A" "a"))
>
> At least, this is what makes sense to me.

I think this function should respect ido-case-fold, but special-casing
equal strings here seems pretty unnatural to me -- if you want to ignore
case, you want to ignore case.

So I've now made this change in Emacs 29.

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