Track InheritedElement dependencies in diagnostic properties (#27387)

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

@@ -3431,6 +3431,12 @@ abstract class Element extends DiagnosticableTree implements BuildContext {
       widget.debugFillProperties(properties);
     }
     properties.add(FlagProperty('dirty', value: dirty, ifTrue: 'dirty'));
+    if (_dependencies != null && _dependencies.isNotEmpty) {
+      final List<DiagnosticsNode> diagnosticsDependencies = _dependencies
+        .map((InheritedElement element) => element.widget.toDiagnosticsNode(style: DiagnosticsTreeStyle.sparse))
+        .toList();
+      properties.add(DiagnosticsProperty<List<DiagnosticsNode>>('dependencies', diagnosticsDependencies));
+    }
   }
 
   @override

packages/flutter/test/widgets/inherited_dependencies_test.dart

+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/src/widgets/basic.dart';
+import 'package:flutter/src/widgets/framework.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('InheritedWidget dependencies show up in diagnostic properties', (WidgetTester tester) async {
+    final GlobalKey key = GlobalKey();
+    await tester.pumpWidget(Directionality(
+      key: key,
+      textDirection: TextDirection.ltr,
+      child: Builder(builder: (BuildContext context) {
+        Directionality.of(context);
+        return const SizedBox();
+      }),
+    ));
+    final InheritedElement element = key.currentContext;
+    expect(
+      element.toStringDeep(minLevel: DiagnosticLevel.info),
+      equalsIgnoringHashCodes(
+        'Directionality-[GlobalKey#00000](textDirection: ltr)\n'
+        '└Builder(dependencies: [Directionality-[GlobalKey#00000]])\n'
+        ' └SizedBox(renderObject: RenderConstrainedBox#00000)\n'
+        ''
+      ),
+    );
+
+    await tester.pumpWidget(Directionality(
+      key: key,
+      textDirection: TextDirection.rtl,
+      child: Builder(builder: (BuildContext context) {
+        Directionality.of(context);
+        return const SizedBox();
+      }),
+    ));
+    expect(
+      element.toStringDeep(minLevel: DiagnosticLevel.info),
+      equalsIgnoringHashCodes(
+        'Directionality-[GlobalKey#00000](textDirection: rtl)\n'
+        '└Builder(dependencies: [Directionality-[GlobalKey#00000]])\n'
+        ' └SizedBox(renderObject: RenderConstrainedBox#00000)\n'
+        ''
+      ),
+    );
+  });
+}

packages/flutter/test/widgets/table_test.dart

@@ -796,25 +796,25 @@ void main() {
     expect(
       element.toStringDeep(minLevel: DiagnosticLevel.info),
       equalsIgnoringHashCodes(
-        'Table-[GlobalKey#00000](renderObject: RenderTable#00000)\n'
+        'Table-[GlobalKey#00000](dependencies: [Directionality], renderObject: RenderTable#00000)\n'
         '├Text("A")\n'
-        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "A", renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
+        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "A", dependencies: [Directionality], renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
         '├Text("B")\n'
-        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "B", renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
+        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "B", dependencies: [Directionality], renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
         '├Text("C")\n'
-        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "C", renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
+        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "C", dependencies: [Directionality], renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
         '├Text("D")\n'
-        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "D", renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
+        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "D", dependencies: [Directionality], renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
         '├Text("EEE")\n'
-        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "EEE", renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
+        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "EEE", dependencies: [Directionality], renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
         '├Text("F")\n'
-        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "F", renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
+        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "F", dependencies: [Directionality], renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
         '├Text("G")\n'
-        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "G", renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
+        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "G", dependencies: [Directionality], renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
         '├Text("H")\n'
-        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "H", renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
+        '│└RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "H", dependencies: [Directionality], renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
         '└Text("III")\n'
-        ' └RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "III", renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
+        ' └RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "III", dependencies: [Directionality], renderObject: RenderParagraph#00000 relayoutBoundary=up1)\n'
       ),
     );
   });