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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Stepping Back: A Wealth Of Completion systems  Re: [ELPA] New
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Date: Wed, 21 Apr 2021 16:02:46 +0300
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> From: Philip Kaludercic <philipk@posteo.net>
> Cc: emacs-devel@gnu.org
> Date: Wed, 21 Apr 2021 12:50:00 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Ideally yes, but is it possible to have a menu that can be both selected
> >> and expanded?
> >
> > I don't think I understand what you mean by "expanded" here.  There
> > are submenus, if that's what you meant.
> 
> The current model I am using assumes that selecting-read is passed a
> list of objects, and each object can have sub-objects (children).

What is the semantics of selecting an object that has children?  Can
you give an example of such use case with one of the UIs we have today
that supports completion?