Re: [RFC PATCH] Per-window face support

[Stefan Monnier <monnier@iro.umontreal.ca>]

> This patch lets us actually vary faces on a window-by-window basis.

Sounds good.

> +   4. Conses of the form
> +   (:filter (:window PARAMETER VALUE) FACE-SPECIFICATION),
> +   which applies FACE-SPECIFICATION only if the
> +   given face attributes are being evaluated in the context of a
> +   window with a parameter named PARAMETER being EQ VALUE.

Is there any chance we could allow running Elisp code there, i.e. allow

    (:filter FUNCTION FACE-SPECIFICATION)

or even just

    (:filter FUNCTION)

where FUNCTION returns the FACE-SPECIFICATION (or nil, say).

>    DEFSYM (QCignore_defface, ":ignore-defface");
>
> +  /* Used for limiting character attributes to windows with specific
> +     characteristics.  */
> +  DEFSYM (Qwindow_kw, ":window");
> +  DEFSYM (Qfiltered_kw, ":filtered");

Our convention is to use QC<foo> rather than Q<foo>_kw for ":foo", as
can be seen above for :ignore-defface.


        Stefan