augroup jnrowe_DotOutlineTree
autocmd!
Disable line numbering and fold columns as they’re of little use here:
autocmd BufNewFile DotOutlineTree* \ setlocal foldcolumn=0 nonumber norelativenumber
We don’t need spelling errors displayed here as they’re already shown in the main buffer:
autocmd BufNewFile DotOutlineTree* setlocal nospell
Use Unicode bullets to mark section levels as this feels nicer to me. This allows to see some basic colouring for depth, and also increases the text density in narrow windows.
autocmd BufNewFile DotOutlineTree*
\ syntax match rstList "^ \{2\}\ze[^ ]" conceal cchar=• |
\ syntax match rstList "^ \{4\}\ze[^ ]" conceal cchar=◦
augroup END