Improve tree-sitter queries for Scala (#9475)

- Simplify function highlighting
- Highlight extension methods
- Textobject query (mia/maa) for class/trait constructor parameters/arguments
- Textobject query (mif/maf) for Scala 3 braceless lambdas

runtime/queries/scala/highlights.scm

@@ -53,28 +53,13 @@
 (var_declaration
   name: (identifier) @variable)
 
-; method definition
+; function definitions/declarations
 
-(class_definition
+(function_declaration
-  body: (template_body
+    name: (identifier) @function.method)
-    [
+
-      (function_definition
+(function_definition
-        name: (identifier) @function.method)
+      name: (identifier) @function.method)
-      (function_declaration
-        name: (identifier) @function.method)
-    ]))
-(trait_definition
-  body: (template_body
-    [
-      (function_definition
-        name: (identifier) @function.method)
-      (function_declaration
-        name: (identifier) @function.method)
-    ]))
-(object_definition
-  body: (template_body
-    (function_definition
-      name: (identifier) @function.method)))
 
 ; imports/exports
 

runtime/queries/scala/textobjects.scm

@@ -1,12 +1,15 @@
 ; Function queries
 
 (function_definition
-  body: (_) @function.inside) @function.around
+  body: (_) @function.inside) @function.around ; Does not include end marker
 
-; Does not match block lambdas or Scala 3 braceless lambdas
 (lambda_expression
   (_) @function.inside) @function.around
 
+; Scala 3 braceless lambda
+(colon_argument
+  (_) @function.inside) @function.around
+
 
 ; Class queries
 
@@ -32,6 +35,9 @@
 (parameters
   ((_) @parameter.inside . ","? @parameter.around) @parameter.around)
 
+(class_parameters
+  ((_) @parameter.inside . ","? @parameter.around) @parameter.around)
+
 (parameter_types
   ((_) @parameter.inside . ","? @parameter.around) @parameter.around)