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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Question about display engine
Date: Fri, 30 Aug 2019 10:26:31 +0300
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To: martin rudalics <rudalics@gmx.at>
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> Cc: emacs-devel@gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Fri, 30 Aug 2019 09:02:54 +0200
> 
>  >> But AFAIU the actual merging rules now will create a new face (if not
>  >> there already) that will have the new background
>  >
>  > No.  At the point which we are discussing, only background of faces
>  > which have the :extend bit set get merged.  So the background of a
>  > face without that bit will simply not get merged.
> 
> It will have to get merged for text that appears _before_ the newline
> character.

For the text before the newline, the :extend bit is ignored when
merging faces.