[BUG] Diff `+`/`-` are colored as punctuation (i.e: grey) instead of addition/deletions

[ambroisie]

Describe the bug

1. Open a diff file, observe that the +/- at the start of lines are grey.

When running Inspect I get:

  - @diff.minus.diff links to DiffDelete diff
  - @punctuation.special.diff links to Delimiter diff

Expected behaviour

It should show up as red/green instead of grey.

Screenshots

No response

[ambroisie]

I think this is related to nvim-treesitter/nvim-treesitter@3aa2e2f / nvim-treesitter/nvim-treesitter#6619.

[ambroisie]

Correction: after applying 20f9003, they are orange rather than grey. Arguably this is even more confusing.