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Re: Question about display engine

From: Ergus
Subject: Re: Question about display engine
Date: Wed, 7 Aug 2019 17:57:38 +0200
User-agent: NeoMutt/20180716

On Wed, Aug 07, 2019 at 06:45:47PM +0300, Eli Zaretskii wrote:
Date: Wed, 7 Aug 2019 17:32:20 +0200
From: Ergus <address@hidden>
Cc: address@hidden

After thinking on that a little bit more since yesterday; maybe it is
possible to add another basic face for the rest of the line. That face
will be merged with the previous face as in the example code, so if it
specifies :underline then merging should work as specified; else, it
will just use the :underline from the latest glyph.

Such a face will not be a fixed face, it will have to be recomputed
whenever the face of the text changes, right?  E.g., if the face of
the text specifies some color, you'd want this additional face to have
the same colors, right?

We don't use the face itself, just to merge with the previous glyph.

So it doesn't seem to be a face that can be customized in the usual
sense.  We could let the users specify face attributes they don't want
to see in face extension, though.

Please look the proposed patch. It may need some improvements, but at
least the functional part is a decent solution for all the issues in my

Attachment: fix_36858.patch
Description: Text document

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