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Re: Can an overlay have a non-overriding face?

From: Eli Zaretskii
Subject: Re: Can an overlay have a non-overriding face?
Date: Mon, 12 Sep 2016 20:03:08 +0300

> From: Alex <>
> Date: Sun, 11 Sep 2016 20:21:22 -0600
> Suppose there are two overlays A and B. Is it possible for overlay A to
> have a higher priority than B yet for the face (or any arbitrary
> property) property to not override B's?

As the ELisp manual says, faces do not override each other, they are

     The priority matters when two or more overlays cover the same
     character and both specify the same property; the one whose
     ‘priority’ value is larger overrides the other.  For the ‘face’
     property, the higher priority overlay’s value does not completely
     override the other value; instead, its face attributes override the
     face attributes of the lower priority ‘face’ property.

IOW, only the same attributes in the lower-priority overlay's face are
overridden, the rest of that face's attributes are kept.

> If not, would that be a reasonable feature request? Currently I made a
> workaround where I copy overlay A, lower its priority, and then put the
> face on that overlay.
> It would be nice if that wasn't necessary.

Depends on the use case.  Please file a feature request, and please
describe your use cases there.


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