patch 8.1.0393: not all white space difference options available commit https://github.com/vim/vim/commit/785fc6567f572b8caefbc89ec29bbd8b801464ae Author: Bram Moolenaar <Bram@vim.org> Date: Sat Sep 15 19:17:38 2018 +0200 patch 8.1.0393: not all white space difference options available Problem: Not all white space difference options available. Solution: Add "iblank", "iwhiteall" and "iwhiteeol" to 'diffopt'.

" 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