Re: Stepping Back: A Wealth Of Completion systems Re: [ELPA] New package: vertico

[Eli Zaretskii]

> From: Yuri Khan <yuri.v.khan@gmail.com>
> Date: Wed, 21 Apr 2021 22:43:28 +0700
> Cc: Philip Kaludercic <philipk@posteo.net>, Emacs developers 
> <emacs-devel@gnu.org>
> 
> > 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?
> 
> Choosing a directory or a mail folder comes to mind. One occasionally
> wants to say “I want to install this program into this directory, even
> though it has subdirectories” or “I want to set up my filter to move
> mail into this folder, even though it has subfolders”.

That's easy to support with menus: just doesn't create the submenu
unless the user says so with some mouse gesture, like pressing some
modifier key when clicking on a menu item.