patch 8.2.0446: listener with undo of deleting all lines not tested Commit: https://github.com/vim/vim/commit/a07e31af545b91925362854a48c42fee16dd8c28 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Mar 25 21:13:46 2020 +0100 patch 8.2.0446: listener with undo of deleting all lines not tested Problem: Listener with undo of deleting all lines not tested. Solution: Add a test.

" Vim filetype plugin
" Language:		JSON
" Maintainer:		David Barnett <daviebdawg+vim@gmail.com>
" Last Change:		2014 Jul 16

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

let b:undo_ftplugin = 'setlocal formatoptions< comments< commentstring<'

setlocal formatoptions-=t

" JSON has no comments.
setlocal comments=
setlocal commentstring=