patch 9.0.1392: using NULL pointer with nested :open command Commit: https://github.com/vim/vim/commit/7ac5023a5f1a37baafbe1043645f97ba3443d9f6 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Mar 7 21:05:04 2023 +0000 patch 9.0.1392: using NULL pointer with nested :open command Problem: Using NULL pointer with nested :open command. Solution: Check that ccline.cmdbuff is not NULL.

" 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