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

[Dmitry Gutov <dgutov@yandex.ru>]

On 27.04.2021 04:59, tumashu wrote:
> 
>> 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,

I use Ivy with posframe (because I like to have a reliably 
frame-centered popup, and by frame usually has 4 windows), but the 
package above actually implements its own rendering based on overlays. 
Probably because they wanted it to be functional in terminal as well.

> is is a good idea
> to move posframe to emacs.git?

My personal rule of thumb is, it should be in emacs.git only if it's 
going to be used by some code inside Emacs. At the moment it seems 
unlikely also because of the same factor: we don't have a similar 
feature/library for rendering popups in terminal Emacs. A few users ago 
Eli (I think?) said it could be created based on the same approach that 
renders menu in the terminal mode, but that still has not materialized.

It's also unfortunate that the core developers usually give GNU ELPA a 
wide berth instead of reviewing the code and making suggestions (in the 
most essential packages, at least). That could be another reason to add 
posframe to the core, but without at least someone among our windowing 
system experts paying attention to it, there would be no point.

And without a terminal mode counterpart/support, it's unlikely to be 
used in the core code.