Update syntax highlighting grammar (flutter#4948)

Author: DanTup

packages/devtools_app/assets/dart_syntax.json

@@ -1,6 +1,6 @@
 {
 	"name": "Dart",
-	"version": "1.0.1",
+	"version": "1.1.1",
 	"fileTypes": [
 		"dart"
 	],
@@ -60,6 +60,9 @@
 		{
 			"include": "#constants-and-special-vars"
 		},
+		{
+			"include": "#operators"
+		},
 		{
 			"include": "#strings"
 		}
@@ -234,27 +237,26 @@
 		"class-identifier": {
 			"patterns": [
 				{
-					"name": "storage.type.primitive.dart",
-					"match": "\\bvoid\\b"
+					"match": "(?<!\\$)\\b(bool|num|int|double|dynamic)\\b(?!\\$)",
+					"name": "support.class.dart"
 				},
 				{
-					"name": "support.class.dart",
-					"match": "\\b(bool|num|int|double|dynamic)\\b"
+					"match": "(?<!\\$)\\bvoid\\b(?!\\$)",
+					"name": "storage.type.primitive.dart"
 				},
 				{
-					"match": "\\b([_$]*[A-Z][a-zA-Z0-9_$]*)(<(?:[a-zA-Z0-9_$<>?]|,\\s*|\\s+extends\\s+)+>)?",
-					"captures": {
+					"begin": "(?<![a-zA-Z0-9_$])([_$]*[A-Z][a-zA-Z0-9_$]*)\\b",
+					"end": "(?!<)",
+					"beginCaptures": {
 						"1": {
 							"name": "support.class.dart"
-						},
-						"2": {
-							"patterns": [
-								{
-									"include": "#type-args"
-								}
-							]
 						}
-					}
+					},
+					"patterns": [
+						{
+							"include": "#type-args"
+						}
+					]
 				}
 			]
 		},
@@ -295,7 +297,7 @@
 					"include": "#class-identifier"
 				},
 				{
-					"match": "[\\s,]+"
+					"match": ","
 				},
 				{
 					"name": "keyword.declaration.dart",
@@ -331,8 +333,20 @@
 				},
 				{
 					"name": "keyword.declaration.dart",
-					"match": "(?<!\\$)\\b(abstract|class|enum|extends|extension|external|factory|implements|get|mixin|native|operator|set|typedef|with|covariant)\\b(?!\\$)"
+					"match": "(?<!\\$)\\b(abstract|class|enum|extends|extension|external|factory|implements|get(?!\\()|mixin|native|operator|set(?!\\()|typedef|with|covariant)\\b(?!\\$)"
+				},
+				{
+					"name": "storage.modifier.dart",
+					"match": "(?<!\\$)\\b(static|final|const|required|late)\\b(?!\\$)"
 				},
+				{
+					"name": "storage.type.primitive.dart",
+					"match": "(?<!\\$)\\b(?:void|var)\\b(?!\\$)"
+				}
+			]
+		},
+		"operators": {
+			"patterns": [
 				{
 					"name": "keyword.operator.dart",
 					"match": "(?<!\\$)\\b(is\\!?)\\b(?!\\$)"
@@ -376,14 +390,6 @@
 				{
 					"name": "keyword.operator.logical.dart",
 					"match": "(!|&&|\\|\\|)"
-				},
-				{
-					"name": "storage.modifier.dart",
-					"match": "(?<!\\$)\\b(static|final|const|required|late)\\b(?!\\$)"
-				},
-				{
-					"name": "storage.type.primitive.dart",
-					"match": "(?<!\\$)\\b(?:void|var)\\b(?!\\$)"
 				}
 			]
 		},

packages/devtools_app/test/test_infra/goldens/syntax_highlighting/classes_mixins.dart.golden

@@ -0,0 +1,43 @@
+>// Copyright 2022 The Chromium Authors. All rights reserved.
+#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ comment.line.double-slash.dart
+>// Use of this source code is governed by a BSD-style license that can be
+#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ comment.line.double-slash.dart
+>// found in the LICENSE file.
+#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ comment.line.double-slash.dart
+>
+>class A {
+#^^^^^ keyword.declaration.dart
+#      ^ support.class.dart
+>  String get name => '';
+#  ^^^^^^ support.class.dart
+#         ^^^ keyword.declaration.dart
+#             ^^^^ entity.name.function.dart
+#                     ^^ string.interpolated.single.dart
+#                       ^ punctuation.terminator.dart
+>  set name(String value) {}
+#  ^^^ keyword.declaration.dart
+#      ^^^^ entity.name.function.dart
+#           ^^^^^^ support.class.dart
+>
+>  void method() {}
+#  ^^^^ storage.type.primitive.dart
+#       ^^^^^^ entity.name.function.dart
+>  void get() {}
+#  ^^^^ storage.type.primitive.dart
+#       ^^^ entity.name.function.dart
+>  void set() {}
+#  ^^^^ storage.type.primitive.dart
+#       ^^^ entity.name.function.dart
+>}
+>
+>mixin MyMixin<T> on List<T> {}
+#^^^^^ keyword.declaration.dart
+#      ^^^^^^^ support.class.dart
+#             ^ other.source.dart
+#              ^ support.class.dart
+#               ^ other.source.dart
+#                 ^^ keyword.control.catch-exception.dart
+#                    ^^^^ support.class.dart
+#                        ^ other.source.dart
+#                         ^ support.class.dart
+#                          ^ other.source.dart