On Mon, Jun 10, 2019 at 7:41 PM Eli Zaretskii <eliz@gnu.org> wrote:

> Right.  So we could use something similar for lines whose numbers are
> integral multiples of N, for some N.  I think a limited number of
> specific features like that is better than a total freedom via a
> function call.

The thread waned, but I still think it'd be useful at least to be able to
use a different face for some line numbers. In fact, having for multiples
of 5, of 10, and all the rest, would be ideal.