text.diff not working with Nord Theme

[dngray]

I noticed I get no syntax highlighting when tree-sitter-diff is active.

It appears that these are not set https://github.com/nvim-treesitter/nvim-treesitter/issues/4097#issuecomment-1374556679

[hoelter]

Playing around with some highlights, it seems that parser provides less specificity than the default highlight groups. Meaning that without that parser, you can have better diff highlighting.