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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 22:25:58 +0300
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Cc: philipk@posteo.net, yuri.v.khan@gmail.com, emacs-devel@gnu.org
To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwv4kfzl9yx.fsf-monnier+emacs@gnu.org> (message from Stefan
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Wed, 21 Apr 2021 15:22:34 -0400
> Cc: philipk@posteo.net, emacs-devel@gnu.org, Yuri Khan <yuri.v.khan@gmail.com>
> 
> > 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.
> 
> I don't think Gtk menus offer such a functionality

Isn't the menu data created by Emacs, GTK or not?  If so, we control
whether a menu item has children or not.