Re: [PATCH] `completing-read`: Add `group-function` support to completion metadata

[Daniel Mendler]

On 4/26/21 1:33 AM, Stefan Monnier wrote:
>> So it's better if at least icomplete-mode is enabled, preferably with an
>> option which shows the completions right away with no input. And the
>> vertical style should be even better.
> 
> Maybe we could accommodate this in the default UI by adding an option to
> eagerly popup the *Completions* buffer (and keep it updated as long as
> it's displayed) and to keep it disabled by default but make it possible
> to enable it via completion-category-(overrides|defaults).

Yes, this sounds useful. It is similar to the configuration by
Protesilaos Stavrou, as he described in his other mail. However
Protesilaos' solution is more feature-rich and is always turned on.
Maybe it makes sense to integrate such enhancements directly in
minibuffer.el. An alternative is a small package providing a minor-mode
in the style of Icomplete. All in all, the default completion UI should
not be neglected when adding new metadata like a `group-function`.

Daniel