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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: face-remapping-alist can not override internal-border face?
Date: Sun, 10 Mar 2019 14:47:57 +0200
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To: tumashu <tumashu@163.com>
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> Date: Sun, 10 Mar 2019 18:14:37 +0800 (CST)
> From: tumashu  <tumashu@163.com>
> Cc: "emacs-devel@gnu.org" <emacs-devel@gnu.org>
> 
> I just want to child-frame have its own border color, i do not know face have "frame" argument
> so I use a buffer-local face-remapping-alist to this job :-)

Buffer-local variables that determine frame-global behavior are a bad
idea.  Don't be surprised if you will see the face change unexpectedly
because some other buffer happened to be the current buffer when the
border was redrawn.