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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Emacs flickers periodically
Date: Sat, 17 Jun 2017 22:37:57 +0300
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> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sat, 17 Jun 2017 22:27:56 +0300
> 
> But *when* does it happen?

When all the windows of a frame that needed to be updated were
updated.