Re: Making `x-underline-at-descent-line' a face attribute

[Jim Porter]

On 1/5/2022 8:44 PM, Po Lu wrote:
> It would be more useful that way for people who rely on an underline at
> the descent line to achieve a bordered effect on the modeline, but who
> don't otherwise want that setting to be applied to text.  Obviously, we
> should keep the global setting for backwards compatibility, probably
> with precedence over the face attribute.
>
> WDYT?

What about enhancing the :box attribute further to allow different 
widths (and possibly colors) for each of the 4 sides? It's already 
possible to specify an outline just on the top and bottom (or the left 
and right) in Emacs 28.

This would also allow mixing a bordered effect with a "regular" 
underline, which could be useful for emphasizing parts of the mode line.

- Jim