patch 9.0.0457: substitute prompt does not highlight an empty match Commit: https://github.com/vim/vim/commit/a04f457a6c071179bac4088c9314007d39d5c5e0 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Sep 13 13:45:26 2022 +0100 patch 9.0.0457: substitute prompt does not highlight an empty match Problem: Substitute prompt does not highlight an empty match. Solution: Highlight at least one character.

" 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