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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: [External] : Re: Would you say this information window is well
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Date: Tue, 23 Feb 2021 17:22:05 +0200
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 (message from Peter Dean on Tue, 23 Feb 2021 05:54:09 +0000)
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> Date: Tue, 23 Feb 2021 05:54:09 +0000
> From: Peter Dean <laszlomail@protonmail.com>
> Cc: Stefan Kangas <stefankangas@gmail.com>, Lars Ingebrigtsen <larsi@gnus.org>, Dmitry Gutov <dgutov@yandex.ru>, Eli Zaretskii <eliz@gnu.org>, "emacs-devel@gnu.org" <emacs-devel@gnu.org>
> 
> I haven't used threads yet, but I guess this search could also be
> done asynchronously from a thread which yields often to keep the
> UI responsive, so the link wouldn't be there when Help is opened,
> but if a link is found then the thread inserts the link into
> the help buffer.

I suggest that you try using threads for such purposes.  Because it's
easier said than done, and IME this kind of jobs is not something for
which Lisp threads, as currently implemented, are suitable.