Re: select yank via completion

[Juri Linkov]

>> +                             (when (> (length s) (- 40 b))
>> +                               (add-text-properties
>> +                                (min (+ b 40) (length s)) (length s)
>> +                                `(display ,ellipsis) s))
>
> Any chance this threshold can be configurable?  I don't mind completions
> as wide as or wider than the frame in Ivy's minibuffer.

The default value 40 was intended to be able to accommodate two columns of
completions in the *Completions* buffer in the default 80-column wide frame,
but indeed a hard-coded constant should be avoided.

Instead of adding a specific defcustom for kill-ring completions,
maybe some more general option is possible in minibuffer.el?
Something like how many columns the user expects for completions.

If a package like ivy is not column-oriented as the *Completions* buffer,
then ivy could set such an option to 1.  Then yank-pop could truncate
completions to the frame width.  Or such truncation should be moved
to minibuffer.el and extended with other features from its TODO item:

;;   - indicate how to display the completions in *Completions* (turn
;;     \n into something else, add special boundaries between
;;     completions).  E.g. when completing from the kill-ring.