Roll the latest dart_style into the SDK.

There are a couple of small format changes, but they are minimal
enough that we might not need to land a pre-built SDK with this.

Change-Id: I1d258c8a782e5db24c2048f407a8b7cf7b948eef
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/325580
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>
Reviewed-by: Leaf Petersen <leafp@google.com>
Reviewed-by: Bob Nystrom <rnystrom@google.com>
Commit-Queue: Bob Nystrom <rnystrom@google.com>

CHANGELOG.md

@@ -173,6 +173,13 @@ constraint][language version] lower bound to 3.2 or greater (`sdk: '^3.2.0'`).
 
 [#53106]: https://github.com/dart-lang/sdk/issues/53106
 
+#### Dart format
+
+- Always split enum declarations containing a line comment.
+- Fix regression in splitting type annotations with library prefixes.
+- Support `--enable-experiment` command-line option to enable language
+  experiments.
+
 #### Pub
 
 - New option `dart pub upgrade --tighten` which will update dependencies' lower

DEPS

@@ -141,7 +141,7 @@ vars = {
   #   and land the review.
   #
   # For more details, see https://github.com/dart-lang/sdk/issues/30164.
-  "dart_style_rev": "2956b1a705953f880a5dae9d3a0969df0fc45e99", # disable rev_sdk_deps.dart
+  "dart_style_rev": "1a2def95a3c04dafd27b85d17e6e828bd4afa1a3", # disable rev_sdk_deps.dart
   "dartdoc_rev": "dd28f4ce4135c019c9943ef6c27e10cdcfe6760c",
   "ecosystem_rev": "e96fbdbf1135a9e41ef66eb23e6c35f41e0e05b7",
   "ffi_rev": "d36e05af55293bcc511d6b3a99ea4b8cb69f6323",

pkg/front_end/testcases/general/base_class_declaration.dart.textual_outline.expect

@@ -1,7 +1,6 @@
 // @dart = 2.19
 base class A {}
-
 abstract base class B {}
-
-base mixin M {}
+base
+mixin M {}
 base class C = Object with M;

pkg/front_end/testcases/general/final_class_declaration.dart.textual_outline.expect

@@ -1,7 +1,5 @@
 // @dart = 2.19
 final class A {}
-
 abstract final class B {}
-
 mixin M {}
 final class C = Object with M;

pkg/front_end/testcases/general/final_class_declaration.dart.textual_outline_modelled.expect

@@ -1,7 +1,5 @@
 // @dart = 2.19
 abstract final class B {}
-
 final class A {}
-
 final class C = Object with M;
 mixin M {}

pkg/front_end/testcases/general/interface_class_declaration.dart.textual_outline.expect

@@ -1,7 +1,5 @@
 // @dart = 2.19
 interface class A {}
-
 abstract interface class B {}
-
 mixin M {}
 interface class C = Object with M;

pkg/front_end/testcases/general/interface_class_declaration.dart.textual_outline_modelled.expect

@@ -1,7 +1,5 @@
 // @dart = 2.19
 abstract interface class B {}
-
 interface class A {}
-
 interface class C = Object with M;
 mixin M {}

pkg/front_end/testcases/general/mixin_class_declaration.dart.textual_outline.expect

@@ -1,7 +1,5 @@
 // @dart = 2.19
 mixin class A {}
-
 abstract mixin class B {}
-
 mixin M {}
 mixin class C = Object with M;

pkg/front_end/testcases/general/mixin_class_declaration.dart.textual_outline_modelled.expect

@@ -1,8 +1,5 @@
 // @dart = 2.19
 abstract mixin class B {}
-
 mixin M {}
-
 mixin class A {}
-
 mixin class C = Object with M;