patch 9.0.1362: ml_get error when going to another tab Commit: https://github.com/vim/vim/commit/99ad3a8bb95c6f860545a050472b6181e33bac1a Author: Bram Moolenaar <Bram@vim.org> Date: Mon Feb 27 17:18:01 2023 +0000 patch 9.0.1362: ml_get error when going to another tab Problem: ml_get error when going to another tab. (Daniel J. Perry) Solution: Do not call update_topline() if "curwin" is invalid. (closes #11907)

" 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