Clean up some things I noticed while doing another change (#45658)

This fixes some minor things I noticed while doing another change.

- Uncomments an old test that wants to be run, but can't be, and marked it as "skipped", so that the code won't rot anymore.
- Added the focus state to the short string version of a FocusNode
- Added a missing piece of information to findAncestorWidgetOfExactType

packages/flutter/lib/src/widgets/focus_manager.dart

@@ -911,7 +911,12 @@ class FocusNode with DiagnosticableTreeMixin, ChangeNotifier {
 
   @override
   String toStringShort() {
-    return '${describeIdentity(this)}${debugLabel != null && debugLabel.isNotEmpty ? '($debugLabel)' : ''}';
+    final bool hasDebugLabel = debugLabel != null && debugLabel.isNotEmpty;
+    final String extraData = '${hasDebugLabel ? debugLabel : ''}'
+        '${hasFocus && hasDebugLabel ? ' ' : ''}'
+        '${hasFocus && !hasPrimaryFocus ? '[IN FOCUS PATH]' : ''}'
+        '${hasPrimaryFocus ? '[PRIMARY FOCUS]' : ''}';
+    return '${describeIdentity(this)}${extraData.isNotEmpty ? '($extraData)' : ''}';
   }
 }
 

packages/flutter/lib/src/widgets/framework.dart

@@ -2044,15 +2044,15 @@ abstract class BuildContext {
   /// Returns the nearest ancestor widget of the given type [T], which must be the
   /// type of a concrete [Widget] subclass.
   ///
-  /// In general, [dependOnInheritedWidgetOfExactType] is more useful, since inherited
-  /// widgets will trigger consumers to rebuild when they change. This method is
-  /// appropriate when used in interaction event handlers (e.g. gesture
-  /// callbacks) or for performing one-off tasks such as asserting that you have
-  /// or don't have a widget of a specific type as an ancestor. The return value
-  /// of a Widget's build method should not depend on the value returned by this
-  /// method, because the build context will not rebuild if the return value of
-  /// this method changes. This could lead to a situation where data used in the
-  /// build method changes, but the widget is not rebuilt.
+  /// In general, [dependOnInheritedWidgetOfExactType] is more useful, since
+  /// inherited widgets will trigger consumers to rebuild when they change. This
+  /// method is appropriate when used in interaction event handlers (e.g.
+  /// gesture callbacks) or for performing one-off tasks such as asserting that
+  /// you have or don't have a widget of a specific type as an ancestor. The
+  /// return value of a Widget's build method should not depend on the value
+  /// returned by this method, because the build context will not rebuild if the
+  /// return value of this method changes. This could lead to a situation where
+  /// data used in the build method changes, but the widget is not rebuilt.
   ///
   /// Calling this method is relatively expensive (O(N) in the depth of the
   /// tree). Only call this method if the distance from this widget to the
@@ -2062,6 +2062,9 @@ abstract class BuildContext {
   /// because the widget tree is no longer stable at that time. To refer to
   /// an ancestor from one of those methods, save a reference to the ancestor
   /// by calling [findAncestorWidgetOfExactType] in [State.didChangeDependencies].
+  ///
+  /// Returns null if a widget of the requested type does not appear in the
+  /// ancestors of this context.
   T findAncestorWidgetOfExactType<T extends Widget>();
 
   /// Returns the [State] object of the nearest ancestor [StatefulWidget] widget

packages/flutter/test/widgets/focus_manager_test.dart

@@ -664,12 +664,12 @@ void main() {
         description,
         equalsIgnoringHashCodes(
           'FocusManager#00000\n'
-          ' │ primaryFocus: FocusNode#00000(Child 4)\n'
+          ' │ primaryFocus: FocusNode#00000(Child 4 [PRIMARY FOCUS])\n'
           ' │ primaryFocusCreator: Container-[GlobalKey#00000] ← [root]\n'
           ' │\n'
-          ' └─rootScope: FocusScopeNode#00000(Root Focus Scope)\n'
+          ' └─rootScope: FocusScopeNode#00000(Root Focus Scope [IN FOCUS PATH])\n'
           '   │ IN FOCUS PATH\n'
-          '   │ focusedChildren: FocusScopeNode#00000\n'
+          '   │ focusedChildren: FocusScopeNode#00000([IN FOCUS PATH])\n'
           '   │\n'
           '   ├─Child 1: FocusScopeNode#00000(Scope 1)\n'
           '   │ │ context: Container-[GlobalKey#00000]\n'
@@ -683,19 +683,19 @@ void main() {
           '   │   └─Child 2: FocusNode#00000\n'
           '   │       context: Container-[GlobalKey#00000]\n'
           '   │\n'
-          '   └─Child 2: FocusScopeNode#00000\n'
+          '   └─Child 2: FocusScopeNode#00000([IN FOCUS PATH])\n'
           '     │ context: Container-[GlobalKey#00000]\n'
           '     │ IN FOCUS PATH\n'
-          '     │ focusedChildren: FocusNode#00000(Child 4)\n'
+          '     │ focusedChildren: FocusNode#00000(Child 4 [PRIMARY FOCUS])\n'
           '     │\n'
-          '     └─Child 1: FocusNode#00000(Parent 2)\n'
+          '     └─Child 1: FocusNode#00000(Parent 2 [IN FOCUS PATH])\n'
           '       │ context: Container-[GlobalKey#00000]\n'
           '       │ IN FOCUS PATH\n'
           '       │\n'
           '       ├─Child 1: FocusNode#00000(Child 3)\n'
           '       │   context: Container-[GlobalKey#00000]\n'
           '       │\n'
-          '       └─Child 2: FocusNode#00000(Child 4)\n'
+          '       └─Child 2: FocusNode#00000(Child 4 [PRIMARY FOCUS])\n'
           '           context: Container-[GlobalKey#00000]\n'
           '           PRIMARY FOCUS\n'
         ));

packages/flutter/test/widgets/focus_scope_test.dart

@@ -227,12 +227,12 @@ void main() {
       expect(parentFocusScope, hasAGoodToStringDeep);
       expect(
         parentFocusScope.toStringDeep(),
-        equalsIgnoringHashCodes('FocusScopeNode#00000(Parent Scope Node)\n'
+        equalsIgnoringHashCodes('FocusScopeNode#00000(Parent Scope Node [IN FOCUS PATH])\n'
             ' │ context: FocusScope\n'
             ' │ IN FOCUS PATH\n'
-            ' │ focusedChildren: FocusNode#00000(Child)\n'
+            ' │ focusedChildren: FocusNode#00000(Child [PRIMARY FOCUS])\n'
             ' │\n'
-            ' └─Child 1: FocusNode#00000(Child)\n'
+            ' └─Child 1: FocusNode#00000(Child [PRIMARY FOCUS])\n'
             '     context: Focus\n'
             '     PRIMARY FOCUS\n'),
       );
@@ -240,16 +240,17 @@ void main() {
       expect(FocusManager.instance.rootScope, hasAGoodToStringDeep);
       expect(
         FocusManager.instance.rootScope.toStringDeep(minLevel: DiagnosticLevel.info),
-        equalsIgnoringHashCodes('FocusScopeNode#00000(Root Focus Scope)\n'
+        equalsIgnoringHashCodes('FocusScopeNode#00000(Root Focus Scope [IN FOCUS PATH])\n'
             ' │ IN FOCUS PATH\n'
-            ' │ focusedChildren: FocusScopeNode#00000(Parent Scope Node)\n'
+            ' │ focusedChildren: FocusScopeNode#00000(Parent Scope Node [IN FOCUS\n'
+            ' │   PATH])\n'
             ' │\n'
-            ' └─Child 1: FocusScopeNode#00000(Parent Scope Node)\n'
+            ' └─Child 1: FocusScopeNode#00000(Parent Scope Node [IN FOCUS PATH])\n'
             '   │ context: FocusScope\n'
             '   │ IN FOCUS PATH\n'
-            '   │ focusedChildren: FocusNode#00000(Child)\n'
+            '   │ focusedChildren: FocusNode#00000(Child [PRIMARY FOCUS])\n'
             '   │\n'
-            '   └─Child 1: FocusNode#00000(Child)\n'
+            '   └─Child 1: FocusNode#00000(Child [PRIMARY FOCUS])\n'
             '       context: Focus\n'
             '       PRIMARY FOCUS\n'),
       );

packages/flutter/test/widgets/navigator_test.dart

@@ -255,42 +255,42 @@ void main() {
     expect(log, equals(<String>['left']));
   });
 
-  // This test doesn't work because the testing framework uses a fake version of
-  // the pointer event dispatch loop.
-  //
-  // TODO(abarth): Test more of the real code and enable this test.
-  // See https://github.com/flutter/flutter/issues/4771.
-  //
-  // testWidgets('Pending gestures are rejected', (WidgetTester tester) async {
-  //   List<String> log = <String>[];
-  //   final Map<String, WidgetBuilder> routes = <String, WidgetBuilder>{
-  //     '/': (BuildContext context) {
-  //       return new Row(
-  //         children: <Widget>[
-  //           new GestureDetector(
-  //             onTap: () {
-  //               log.add('left');
-  //               Navigator.pushNamed(context, '/second');
-  //             },
-  //             child: new Text('left')
-  //           ),
-  //           new GestureDetector(
-  //             onTap: () { log.add('right'); },
-  //             child: new Text('right')
-  //           ),
-  //         ]
-  //       );
-  //     },
-  //     '/second': (BuildContext context) => new Container(),
-  //   };
-  //   await tester.pumpWidget(new MaterialApp(routes: routes));
-  //   TestGesture gesture = await tester.startGesture(tester.getCenter(find.text('right')), pointer: 23);
-  //   expect(log, isEmpty);
-  //   await tester.tap(find.text('left'));
-  //   expect(log, equals(<String>['left']));
-  //   await gesture.up();
-  //   expect(log, equals(<String>['left']));
-  // });
+   testWidgets('Pending gestures are rejected', (WidgetTester tester) async {
+     final List<String> log = <String>[];
+     final Map<String, WidgetBuilder> routes = <String, WidgetBuilder>{
+       '/': (BuildContext context) {
+         return Row(
+           children: <Widget>[
+             GestureDetector(
+               onTap: () {
+                 log.add('left');
+                 Navigator.pushNamed(context, '/second');
+               },
+               child: const Text('left')
+             ),
+             GestureDetector(
+               onTap: () { log.add('right'); },
+               child: const Text('right'),
+             ),
+           ]
+         );
+       },
+       '/second': (BuildContext context) => Container(),
+     };
+     await tester.pumpWidget(MaterialApp(routes: routes));
+     final TestGesture gesture = await tester.startGesture(tester.getCenter(find.text('right')), pointer: 23);
+     expect(log, isEmpty);
+     await tester.tap(find.text('left'));
+     expect(log, equals(<String>['left']));
+     await gesture.up();
+     expect(log, equals(<String>['left']));
+
+     // This test doesn't work because it relies on part of the pointer event
+     // dispatching mechanism that is mocked out in testing. We should use the real
+     // mechanism even during testing and enable this test.
+     // TODO(abarth): Test more of the real code and enable this test.
+     // See https://github.com/flutter/flutter/issues/4771.
+   }, skip: true);
 
   testWidgets('popAndPushNamed', (WidgetTester tester) async {
     final Map<String, WidgetBuilder> routes = <String, WidgetBuilder>{