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

[tumashu]

>My ideal UI would probably be more like this: 
>https://emacs-lsp.github.io/lsp-ui/images/lsp-xref.gif (though perhaps 
>with a slightly different layout). Meaning, a posframe popup showing the 

Wow, cool!!!
it seem to many packages use posframe at the moment, is is a good idea
to move posframe to emacs.git?  

>list of all locations, vertically, and a preview popup by its side or 
>below it, displaying the current selected location.
>
>Ivy should be easy enough to extend to do that, I think. *Completions* - 
>not so much.