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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Sv: Sticky tooltips
Date: Mon, 05 Oct 2020 12:48:58 +0300
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To: Arthur Miller <arthur.miller@live.com>
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 (message from Arthur Miller on Mon, 05 Oct 2020 11:27:15 +0200)
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> From: Arthur Miller <arthur.miller@live.com>
> Cc: emacs-devel@gnu.org
> Date: Mon, 05 Oct 2020 11:27:15 +0200
> 
> Where do I find the mouse motion callback for tooltips? 

I don't understand the question, sorry.  What is this callback you are
looking for? what is it supposed to do?

> This also leaves question how it will behave if a tooltip frame is live
> on the screen and another tooltip frame is "requested".

In that case we pop down the previous tooltip, AFAIR.  There can be
only one tooltip active at any given time.