patch 8.0.0329: xfontset and guifontwide are not tested commit https://github.com/vim/vim/commit/10434674821939222bf552d15d93e0132d13badc Author: Bram Moolenaar <Bram@vim.org> Date: Sun Feb 12 19:59:08 2017 +0100 patch 8.0.0329: xfontset and guifontwide are not tested Problem: Xfontset and guifontwide are not tested. Solution: Add tests. (Kazunobu Kuriyama)

" 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