Hide `SelectableRegion` text selection toolbar when orientation changes (#104841)

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

@@ -16,6 +16,7 @@ import 'focus_manager.dart';
 import 'focus_scope.dart';
 import 'framework.dart';
 import 'gesture_detector.dart';
+import 'media_query.dart';
 import 'overlay.dart';
 import 'selection_container.dart';
 import 'text_editing_intents.dart';
@@ -212,6 +213,8 @@ class _SelectableRegionState extends State<SelectableRegion> with TextSelectionD
   bool get _hasSelectionOverlayGeometry => _selectionDelegate.value.startSelectionPoint != null
                                         || _selectionDelegate.value.endSelectionPoint != null;
 
+  Orientation? _lastOrientation;
+
   @override
   void initState() {
     super.initState();
@@ -228,6 +231,33 @@ class _SelectableRegionState extends State<SelectableRegion> with TextSelectionD
     );
   }
 
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+
+    switch (defaultTargetPlatform) {
+      case TargetPlatform.android:
+      case TargetPlatform.iOS:
+        break;
+      case TargetPlatform.fuchsia:
+      case TargetPlatform.linux:
+      case TargetPlatform.macOS:
+      case TargetPlatform.windows:
+        return;
+    }
+
+    // Hide the text selection toolbar on mobile when orientation changes.
+    final Orientation orientation = MediaQuery.of(context).orientation;
+    if (_lastOrientation == null) {
+      _lastOrientation = orientation;
+      return;
+    }
+    if (orientation != _lastOrientation) {
+      _lastOrientation = orientation;
+      hideToolbar(defaultTargetPlatform == TargetPlatform.android);
+    }
+  }
+
   @override
   void didUpdateWidget(SelectableRegion oldWidget) {
     super.didUpdateWidget(oldWidget);
@@ -703,7 +733,7 @@ class _SelectableRegionState extends State<SelectableRegion> with TextSelectionD
   void hideToolbar([bool hideHandles = true]) {
     _selectionOverlay?.hideToolbar();
     if (hideHandles) {
-      _selectionOverlay?.hideToolbar();
+      _selectionOverlay?.hideHandles();
     }
   }
 

packages/flutter/test/widgets/selectable_region_test.dart

@@ -1100,6 +1100,46 @@ void main() {
       expect(clipboardData['text'], 'thank');
     }, skip: kIsWeb); // [intended] Web uses its native context menu.
   });
+
+  testWidgets('toolbar is hidden on mobile when orientation changes', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: SelectableRegion(
+          focusNode: FocusNode(),
+          selectionControls: materialTextSelectionControls,
+          child: const Text('How are you?'),
+        ),
+      ),
+    );
+    addTearDown(tester.binding.window.clearPhysicalSizeTestValue);
+
+    final RenderParagraph paragraph1 = tester.renderObject<RenderParagraph>(find.descendant(of: find.text('How are you?'), matching: find.byType(RichText)));
+    final TestGesture gesture = await tester.startGesture(textOffsetToPosition(paragraph1, 6)); // at the 'r'
+    addTearDown(gesture.removePointer);
+    await tester.pump(const Duration(milliseconds: 500));
+    // `are` is selected.
+    expect(paragraph1.selections[0], const TextSelection(baseOffset: 4, extentOffset: 7));
+    await tester.pumpAndSettle();
+    // Text selection toolbar has appeared.
+    expect(find.text('Copy'), findsOneWidget);
+
+    // Hide the toolbar by changing orientation.
+    tester.binding.window.physicalSizeTestValue = const Size(1800.0, 2400.0);
+    await tester.pumpAndSettle();
+    expect(find.text('Copy'), findsNothing);
+
+    // Handles should be hidden as well on Android
+    expect(
+      find.descendant(
+        of: find.byType(CompositedTransformFollower),
+        matching: find.byType(Padding),
+      ),
+      defaultTargetPlatform == TargetPlatform.android ? findsNothing : findsNWidgets(2),
+    );
+  },
+    skip: kIsWeb, // [intended] Web uses its native context menu.
+    variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.android }),
+  );
 }
 
 class SelectionSpy extends LeafRenderObjectWidget {