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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Need help to debug bugs(#22989, #23412)
Date: Sun, 27 Oct 2019 09:12:20 +0200
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To: HaiJun Zhang <netjune@outlook.com>
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 (message from HaiJun Zhang on Sun, 27 Oct 2019 07:00:04 +0000)
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> From: HaiJun Zhang <netjune@outlook.com>
> CC: "emacs-devel@gnu.org" <emacs-devel@gnu.org>
> Date: Sun, 27 Oct 2019 07:00:04 +0000
> 
> Setting redisplay-dont-pause to t causes other problem for emacs after 26.2, which is worse than this one.
> See https://lists.gnu.org/archive/html/emacs-devel/2019-01/msg00495.html

Sounds like all of this is specific to NS.  So maybe the solution
should also be specific to NS, like maybe the change that you say
started all this should be disable on NS.