commit https://github.com/vim/vim/commit/e68c25c677167bb90ac5ec77038e340c730b6567 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 25 15:39:55 2015 +0200 patch 7.4.833 Problem: More side effects of ":set all&" are missing. (Bj?rn Linse) Solution: Call didset_options() and add didset_options2() to collect more side effects to take care of. Still not everything...

" Vim support file to switch off loading plugins for file types
"
" Maintainer:	Bram Moolenaar <Bram@vim.org>
" Last Change:	2011 Oct 20

if exists("did_load_ftplugin")
  unlet did_load_ftplugin
endif

" Remove all autocommands in the filetypeplugin group, if any exist.
if exists("#filetypeplugin")
  silent! au! filetypeplugin *
endif