bug#73820: 31.0.50; [Feature Request]how to hide *Completions* buffer when icomplete-in-buffer is not nil

[Juri Linkov]

> I would like to use `icomplete-mode`/`icomplete-vertical-mode` with
>
>  (setq icomplete-in-buffer t)
>
>  but I don't want to display the `*Completions*` buffer.
>
>  How about adding a new value for `completion-auto-help` to achieve this?

As suggested in https://debbugs.gnu.org/67661#114
this is currently achievable by

  (advice-add 'completion-at-point :after #'minibuffer-hide-completions)

But adding a new option is also an option.