patch 8.0.0408: updating folds does not always work properly commit https://github.com/vim/vim/commit/eadbc2b46176e2aff2cde5f3874b734ae2ae082a Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 4 18:42:39 2017 +0100 patch 8.0.0408: updating folds does not always work properly Problem: Updating folds does not work properly when inserting a file and a few other situations. Solution: Adjust the way folds are updated. (Matthew Malcomson)

" Common preparations for running tests.

" Make sure 'runtimepath' and 'packpath' does not include $HOME.
set rtp=$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after
if has('packages')
  let &packpath = &rtp
endif

" Only when the +eval feature is present. 
if 1
  " Make sure $HOME does not get read or written.
  let $HOME = '/does/not/exist'
endif