commit https://github.com/vim/vim/commit/6d8d849f5ac8a3a228c62fd29e8f40ae1b8381fc Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 19 14:48:31 2016 +0100 patch 7.4.1598 Problem: When starting the GUI fails a swap file is left behind. (Joerg Plate) Solution: Preserve files before exiting. (closes https://github.com/vim/vim/issues/692)

" Vim indent file
" Language:	Mail
" Maintainer:	Bram Moolenaar
" Last Change:	2009 Jun 03

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

" What works best is auto-indenting, disable other indenting.
" For formatting see the ftplugin.
setlocal autoindent nosmartindent nocindent indentexpr=