patch 9.0.1081: using "->" with split lines does not always work Commit: https://github.com/vim/vim/commit/34820944ed101e1fbad16d552308f1486e715d27 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Dec 19 20:28:38 2022 +0000 patch 9.0.1081: using "->" with split lines does not always work Problem: Using "->" with split lines does not always work. Solution: Avoid trying to get another line. (closes https://github.com/vim/vim/issues/11723)

" Vim indent file
" Language:	Mail
" Maintainer:	Bram Moolenaar
" Last Change:	2021 Sep 26

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=

let b:undo_indent = "setl ai< cin< inde< si<"