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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Current master d5622eb6ff, font display issue.
Date: Thu, 08 Aug 2019 20:10:55 +0300
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References: <8736ict25t.wl-all_but_last@163.com>
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To: Zhu Zihao <all_but_last@163.com>
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In-reply-to: <87y303sp9b.wl-all_but_last@163.com> (message from Zhu Zihao on
 Thu, 08 Aug 2019 22:30:56 +0800)
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> Date: Thu, 08 Aug 2019 22:30:56 +0800
> From: Zhu Zihao <all_but_last@163.com>
> Cc: Zhu Zihao <all_but_last@163.com>,
> 	emacs-devel@gnu.org
> 
> > > | English | 中文 |   |   |   |
> > > |---------+------+---+---+---|
> > > |         |      |   |   |   |
> > 
> > Are you saying that this used to work OK for you, and now it doesn't?
> > If so, can you please bisect to find the offending commit?
> > 
> 
> I'm sure that Emacs 26.2 didn't have this issue, I'll try to find which commit
> introduced the issue, but it may take some time. 

In that case, it could be because we now use the HarfBuzz shaping
engine by default.  Could you try using the Git master version with an
other font backend (via the 'font-backend' frame parameter), or
building the Git master version configured --with-harfbuzz=no?