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Re: Question about display engine

From: Ergus
Subject: Re: Question about display engine
Date: Wed, 28 Aug 2019 20:19:58 +0200
User-agent: NeoMutt/20180716

On Wed, Aug 28, 2019 at 08:24:26PM +0300, Eli Zaretskii wrote:
Date: Wed, 28 Aug 2019 18:31:42 +0200
From: Ergus <address@hidden>
Cc: Eli Zaretskii <address@hidden>, address@hidden

Any way my question comes from 2 frequent use cases I don't know what's
the expected behavior:

1) Base face sets background and extend; and face sets only background.

The background of the base face will be extended.

But AFAIU the actual merging rules now will create a new face (if not
there already) that will have the new background; so this means that
then we need a way to remember the last background color where
background and extend where set at the same time; so the extend flag
will be not a bool flag, but a pointer (or a copy) to a previous point
(value) in the faces stack??

Then at the last step of the merge we could potentially have N exact
equal faces that only have difference in those points.

2) Base face sets extend but not background; and face sets both.

The background of the face will be extended.

in what condition the :extend attribute goes to the merged face? Always?
when in base_face? When in face?

The :extend attribute determines whether the background color of the
face with that attribute does or doesn't get merged into the "merged
face" to be used by the iterator.

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