bug#71716: [PATCH] Add new completion-preview-insert-{word, sexp} commands

[Juri Linkov]

> +;; This command is not bound by default, but you may want to bind it to
> +;; M-f (or remap `forward-word') in `completion-preview-active-mode-map'
> +;; since it's very much like a `forward-word' that also moves "into" the
> +;; completion preview.

Also this is very much like 'C-w' in Isearch (isearch-yank-word-or-char),
and 'C-w' does nothing without the region, only raises an error
"The mark is not set now, so there is no region".
So 'C-w' could be bound by default.