Re: `isearch-complete1' should use `completion-at-point' or `completion-in-region'

[Juri Linkov]

> FWIW, I think it might be worthwhile trying to rewrite isearch such that
> it always uses the minibuffer (instead of using a transient keymap and
> displaying the search string in the echo area).

For the sake of backward-compatibility it would be easier
to write a new package implementing just a mapping from keys typed
in the isearch minibuffer to the search functions from isearch.el
invoked on the original buffer.