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Re: Idea: Be able to use text properties as face attributes

From: Eli Zaretskii
Subject: Re: Idea: Be able to use text properties as face attributes
Date: Mon, 27 Mar 2017 17:54:26 +0300

> From: Clément Pit-Claudel <address@hidden>
> Date: Sun, 26 Mar 2017 16:01:13 -0400
> This sounds interesting, and the proposal is clear and nice.  Can you think 
> of 
> concrete examples where it would things much easier for package developers 
> (your example with 'invisible is nice)?
> I can think of one, if I understand correctly.  Currently, if one want 
> font-lock to apply properties other tan face, then one must add these 
> properties to font-lock-extra-managed-props — and then font-lock will remove 
> these properties indiscriminately, regardless of where they came from.  This 
> makes things difficult sometimes. With your proposal, these attributes could 
> be 
> tucked in a face.  On the other hand, one could imagine font-lock being 
> smarter 
> and removing only the properties that it added.

Or we could provide a JIT mechanism to apply properties other than
face properties.

> Fundamentally, is there a good reason to have a distinction between
> face properties and text properties ?

I don't think I understand the question.  Face properties _are_ text
properties.  Or are you talking about face attributes?  If the latter,
then every text property can potentially have attributes, so face
attributes are not special in this respect.

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