patch 9.0.1199: crash when using kitty and using a mapping with <Esc> Commit: https://github.com/vim/vim/commit/584b853ee034754edd278d15f2966ac3d8c9d72c Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 14 21:07:07 2023 +0000 patch 9.0.1199: crash when using kitty and using a mapping with <Esc> Problem: Crash when using kitty and using a mapping with <Esc>. Solution: Do not try setting did_simplify when it is NULL. (closes https://github.com/vim/vim/issues/11817)

" Vim filetype plugin file
" Language:             Vim help file
" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
" Latest Revision:      2018-12-29

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

let s:cpo_save = &cpo
set cpo&vim

let b:undo_ftplugin = "setl fo< tw< cole< cocu< keywordprg<"

setlocal formatoptions+=tcroql textwidth=78 keywordprg=:help
if has("conceal")
  setlocal cole=2 cocu=nc
endif

let &cpo = s:cpo_save
unlet s:cpo_save