Include tags in SemanticsNode debug properties (#35491)

packages/flutter/lib/src/semantics/semantics.dart

@@ -2082,6 +2082,7 @@ class SemanticsNode extends AbstractNode with DiagnosticableTreeMixin {
       }
       properties.add(DiagnosticsProperty<Rect>('rect', rect, description: description, showName: false));
     }
+    properties.add(IterableProperty<String>('tags', tags?.map((SemanticsTag tag) => tag.name), defaultValue: null));
     final List<String> actions = _actions.keys.map<String>((SemanticsAction action) => describeEnum(action)).toList()..sort();
     final List<String> customSemanticsActions = _customSemanticsActions.keys
       .map<String>((CustomSemanticsAction action) => action.label)

packages/flutter/test/semantics/semantics_test.dart

@@ -435,6 +435,7 @@ void main() {
       '   isMergedIntoParent: false\n'
       '   mergeAllDescendantsIntoThisNode: false\n'
       '   Rect.fromLTRB(0.0, 0.0, 0.0, 0.0)\n'
+      '   tags: null\n'
       '   actions: []\n'
       '   customActions: []\n'
       '   flags: []\n'
@@ -530,6 +531,7 @@ void main() {
       '   isMergedIntoParent: false\n'
       '   mergeAllDescendantsIntoThisNode: false\n'
       '   Rect.fromLTRB(0.0, 0.0, 0.0, 0.0)\n'
+      '   tags: null\n'
       '   actions: customAction\n'
       '   customActions: action1, action2, action3\n'
       '   flags: []\n'
@@ -551,7 +553,16 @@ void main() {
       '   elevation: 0.0\n'
       '   thickness: 0.0\n',
     );
+  });
+
+  test('Tags show up in debug properties', () {
+    final SemanticsNode actionNode = SemanticsNode()
+      ..tags = <SemanticsTag>{RenderViewport.useTwoPaneSemantics};
 
+    expect(
+      actionNode.toStringDeep(),
+      contains('\n   tags: RenderViewport.twoPane\n'),
+    );
   });
 
   test('SemanticsConfiguration getter/setter', () {