patch 8.2.4798: t_8u option was reset even when set by the user Commit: https://github.com/vim/vim/commit/dbec26d7893dca4ff38fa4b96ac91203d30ccae5 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Apr 20 19:08:50 2022 +0100 patch 8.2.4798: t_8u option was reset even when set by the user Problem: t_8u option was reset even when set by the user. Solution: Only reset t_8u when using the default value. (closes https://github.com/vim/vim/issues/10239)

" 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