Fix Broken Attribute Highlights

[Chickenkeeper]

The deleted code contained keys that aren't used by Helix's themes, caused inconsistent highlighting of punctuation, highlighted lowercase arguments as integers, and was in the wrong section of the file.

However it was also highlighting derive as @special instead of function.macro, so if we want to keep that behaviour then maybe something like this could be inserted at the top of the Macros section instead?

(attribute
  (identifier) @special
  (#eq? @special "derive")
)

[the-mikedavis]

@special is undocument but used in a bunch of themes. It's used for rust's ? operator and in the picker for highlighted matches. @_macro or any other scope with an underscore is used within a match just so the capture can be referenced in the predicate: here it's used so we can assert that the attribute's name is derive. The @_macro capture can probably be replaced with @special so that the @special highlighting doesn't apply to the #[/,/] parts of the attribute. The only thing that looks really out-of-place to me in this stanza is the constant.numeric.integer capture. I didn't test this but it can most likely be removed or replaced with @type

[Chickenkeeper]

That makes sense. I've added the stanza I suggested plus your suggestion of capturing the arguments as type instead of constant.numeric.integer to handle the edge case where a derive might need to use a trait with a lowercase name, or to stop the colour changing as a name is being typed. I've also added special to the docs, as well as type.enum.variant which is also used a lot but undocumented