patch 9.0.1627: no generic mechanism to test syntax plugins Commit: https://github.com/vim/vim/commit/46acad7284cba7842b5e505fa3d07e99806d246f Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jun 11 19:04:18 2023 +0100 patch 9.0.1627: no generic mechanism to test syntax plugins Problem: No generic mechanism to test syntax plugins. Solution: Add a syntax plugin test mechanism, using screendumps. Add a simple test for "c".

" Vim filetype plugin file
" Language:	hg (Mercurial) commit file
" Maintainer:	Ken Takata <kentkt at csc dot jp>
" Last Change:	2016 Jan 6
" Filenames:	hg-editor-*.txt
" License:	VIM License
" URL:		https://github.com/k-takata/hg-vim

if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

setlocal nomodeline

let b:undo_ftplugin = 'setl modeline<'