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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: BIKESHED: completion faces
Date: Fri, 08 Nov 2019 18:16:50 +0200
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> From: João Távora <joaotavora@gmail.com>
> Date: Fri, 8 Nov 2019 16:01:54 +0000
> Cc: Ergus <spacibba@aol.com>, emacs-devel <emacs-devel@gnu.org>, 
> 	Stefan Monnier <monnier@iro.umontreal.ca>, Dmitry Gutov <dgutov@yandex.ru>
> 
> So, using the opportunity that the subject is fresh now, would
> you object that 'flex' starts using a new face, say
> 'completion-flex-pattern-emphasis' or 'flex-pattern-emphasis' ,
> that inherits from the current 'completions-first-difference' face?

It's possible, though perhaps not optimal.  I'd prefer to try to use
the same faces, and have their names explain what they do in a
sufficiently generalized way which would fit all styles.