patch 8.2.2830: terminal colors are not updated when 'background' is set Commit: https://github.com/vim/vim/commit/ad431995721b2a886f789e2ea7db4c84b732eb18 Author: Bram Moolenaar <Bram@vim.org> Date: Mon May 3 20:40:38 2021 +0200 patch 8.2.2830: terminal colors are not updated when 'background' is set Problem: Terminal colors are not updated when 'background' is set. Solution: Call term_update_colors() for all terminals. (Marcin Szamotulski, closes #8171, closes #8150)

" 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