bug#27807: 25.2; ido-completing-read handles cons-style initial-input wrong

[Lars Ingebrigtsen]

Ryan <rct@thompsonclan.org> writes:

>> `completing-read' uses 0-based index while `read-from-minibuffer' uses
>> 1-based index.
>
> Looking at "ido-read-internal", it passes the inital-input argument
> directly to "read-from-minibuffer" without incrementing it as
> "completing-read-default" does. Therefore any initial input of the form
> "(STRING . POSITION)" is handled incorrectly by ido, but this can be
> fixed by copying over the logic from "completing-read-default", as in
> this patch:
> https://mneme.dedyn.io/zerobin/?7cd07d73217c68e5#Aynth3YcZDcE7bkq8cxQnBl+uJ0/+d0UGYmB+7PqLT4=

The link is dead now, but I think I've now fixed this for Emacs 27.

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