commit https://github.com/vim/vim/commit/3ef5bf7d459d6b8a21aaefc80f65448f5a7aa59f Author: Bram Moolenaar <Bram@vim.org> Date: Wed Jun 15 22:41:31 2016 +0200 patch 7.4.1941 Problem: Not all quickfix tests are also done with the location lists. Solution: Test more quickfix code. Use user commands instead of "exe". (Yegappan Lakshmanan)

" 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