Highlight decorator name

[verhovsky]

In this code

@my_decorator
def foo():
  return 1

module [0, 0] - [3, 0]
  decorated_definition [0, 0] - [2, 10]
    decorator [0, 0] - [0, 13]
      identifier [0, 1] - [0, 13]
    definition: function_definition [1, 0] - [2, 10]
      name: identifier [1, 4] - [1, 7]
      parameters: parameters [1, 7] - [1, 9]
      body: block [2, 2] - [2, 10]
        return_statement [2, 2] - [2, 10]
          integer [2, 9] - [2, 10]

with the current rules, only the @ is highlighted as a function in the Zed editor. This change is to make the my_decorator part also get highlighted as a function.

The reason this special case is needed is because decorators can be expressions, you can write something like this

decorators = [dec_a, dec_b, dec_c]

@(decorators[1])
def foo():
  return 1

but the vast majority of the time you're just doing @my_decorator.

[verhovsky]

I haven't tried this because

  CXX(target) Release/obj.target/tree_sitter_python_binding/bindings/node/binding.o
In file included from ../bindings/node/binding.cc:1:
../node_modules/nan/nan.h:2548:8: error: no matching member function for call to 'SetAccessor'
  tpl->SetAccessor(
  ~~~~~^~~~~~~~~~~

[verhovsky]

It seems like on GitHub, the current rule makes everything in the expression highlight as a function, but in Zed the opposite, only the @ is highlighted.