patch 8.1.0256: using setline() in TextChangedI splits undo commit https://github.com/vim/vim/commit/9fa9506853516c82851baec643aa47458cb8b3bc Author: Bram Moolenaar <Bram@vim.org> Date: Wed Aug 8 22:08:32 2018 +0200 patch 8.1.0256: using setline() in TextChangedI splits undo Problem: Using setline() in TextChangedI splits undo. Solution: Use another solution for undo not working properly.

" Settings for test script execution
" Always use "sh", don't use the value of "$SHELL".
set shell=sh

" Only when the +eval feature is present. 
if 1
  " While some tests overwrite $HOME to prevent them from polluting user files,
  " we need to remember the original value so that we can tell external systems
  " where to ask about their own user settings.
  let g:tester_HOME = $HOME
endif

source setup.vim