Subject: 26.0.50; display-line-numbers: allow to set alternate face for multiples of N

From: Yuri D'Elia <[email-masked]>
Date: Mon, 17 Jul 2017 16:38:38 +0200

Severity: wishlist

When displaying line numbers using the new `display-line-numbers'
feature, we could add a face to be used for each line number that is a
multiple of some number N, which could be specified by the user.

 display-line-numbers-alternate (interger or nil to disable)
 line-number-alternate (alternative face)

When used with line-number-current-line, line-number-current-line
obviously takes precedence.