Re: region-based face-remapping

[Eli Zaretskii]

> From: JD Smith <jdtsmith@gmail.com>
> Date: Mon, 1 Jan 2024 19:22:29 -0500
> 
> 
> Has there been any discussion of implementing region-based face remapping, 
> perhaps by adding 'face-remap as a property to overlays?  This would be very 
> useful for modes in which local syntax highlighting depends on point, now 
> broadly possible thanks to treesitter (think “brighten surrounding semantic 
> unit” or similar).

If you only want to change the appearance around point, you need a
much smaller revolution than position-dependent faces, which are
something much more general.  E.g., position-dependent faces need to
change all the face-related APIs to pass a position and a buffer
arguments, whereas if it's only "around point", you need nothing like
that because the position of point is always known in each buffer.