patch 8.2.4505: Vim9: outdated "autocmd nested" still works Commit: https://github.com/vim/vim/commit/f07751457c39a645009c17cd837131f6bcdd7d55 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Mar 4 20:10:38 2022 +0000 patch 8.2.4505: Vim9: outdated "autocmd nested" still works Problem: Vim9: outdated "autocmd nested" still works. Solution: Do not accept the :autocmd argument "nested" without "++" in Vim9 script.

" 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