patch 8.2.2640: screenstring() returns non-existing composing characters Commit: https://github.com/vim/vim/commit/f1387285e2ebe5cb3688d729fc6fd01a169a76c1 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Mar 22 17:11:15 2021 +0100 patch 8.2.2640: screenstring() returns non-existing composing characters Problem: screenstring() returns non-existing composing characters. Solution: Only use composing characters if there is a base character.

" VIM syntax file
" Language:	groff
" Maintainer:	Alejandro López-Valencia <dradul@yahoo.com>
" URL:		http://dradul.tripod.com/vim
" Last Change:	2003-05-08-12:41:13 GMT-5.

" This uses the nroff.vim syntax file.
let b:main_syntax = "nroff"
let b:nroff_is_groff = 1
runtime! syntax/nroff.vim