patch 8.0.0496: insufficient testing for folding commit https://github.com/vim/vim/commit/518c9b133baed4b1a555d7be0ece1b48bb234b1d Author: Bram Moolenaar <Bram@vim.org> Date: Tue Mar 21 11:48:39 2017 +0100 patch 8.0.0496: insufficient testing for folding Problem: Insufficient testing for folding. Solution: Add a couple more fold tests. (Dominique Pelle, closes https://github.com/vim/vim/issues/1579)

" Simplistic way to make spaces and Tabs visible

" This can be added to an already active syntax.

syn match Space " "
syn match Tab "\t"
if &background == "dark"
  hi def Space ctermbg=darkred guibg=#500000
  hi def Tab ctermbg=darkgreen guibg=#003000
else
  hi def Space ctermbg=lightred guibg=#ffd0d0
  hi def Tab ctermbg=lightgreen guibg=#d0ffd0
endif