Enable contextMenuBuilder in the absence of selectionControls (#141810)

packages/flutter/lib/src/gestures/events.dart

@@ -39,7 +39,7 @@ const int kPrimaryButton = 0x01;
 ///
 /// It is equivalent to:
 ///
-///  * [kPrimaryStylusButton]: The stylus contacts the screen.
+///  * [kPrimaryStylusButton]: The stylus' primary button.
 ///  * [kSecondaryMouseButton]: The secondary mouse button.
 ///
 /// See also:
@@ -97,7 +97,7 @@ const int kPrimaryStylusButton = kSecondaryButton;
 ///
 /// It is equivalent to:
 ///
-///  * [kMiddleMouseButton]: The tertiary mouseButton.
+///  * [kMiddleMouseButton]: The tertiary mouse button.
 ///  * [kSecondaryStylusButton]: The secondary button on a stylus. This is considered
 ///    a tertiary button as the primary button of a stylus already corresponds to a
 ///    "secondary operation" (where stylus contact is the primary operation).

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

@@ -4320,7 +4320,6 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
   /// Toggles the visibility of the toolbar.
   void toggleToolbar([bool hideHandles = true]) {
     final TextSelectionOverlay selectionOverlay = _selectionOverlay ??= _createSelectionOverlay();
-
     if (selectionOverlay.toolbarIsVisible) {
       hideToolbar(hideHandles);
     } else {

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

@@ -448,7 +448,7 @@ class TextSelectionOverlay {
   void showToolbar() {
     _updateSelectionOverlay();
 
-    if (selectionControls is! TextSelectionHandleControls) {
+    if (selectionControls != null && selectionControls is! TextSelectionHandleControls) {
       _selectionOverlay.showToolbar();
       return;
     }

packages/flutter/test/widgets/text_selection_test.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/foundation.dart' show ValueListenable, defaultTargetPlatform;
+import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
@@ -1781,6 +1781,51 @@ void main() {
       );
     });
   });
+
+  testWidgets('Context menus', (WidgetTester tester) async {
+    final TextEditingController controller = TextEditingController(
+      text: 'You make wine from sour grapes',
+    );
+    addTearDown(controller.dispose);
+    final GlobalKey<EditableTextState> editableTextKey = GlobalKey<EditableTextState>();
+    final FakeTextSelectionGestureDetectorBuilderDelegate delegate = FakeTextSelectionGestureDetectorBuilderDelegate(
+      editableTextKey: editableTextKey,
+      forcePressEnabled: false,
+      selectionEnabled: true,
+    );
+    final TextSelectionGestureDetectorBuilder provider =
+        TextSelectionGestureDetectorBuilder(delegate: delegate);
+    final FocusNode focusNode = FocusNode();
+    addTearDown(focusNode.dispose);
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: provider.buildGestureDetector(
+          behavior: HitTestBehavior.translucent,
+          child: EditableText(
+            key: editableTextKey,
+            controller: controller,
+            focusNode: focusNode,
+            backgroundCursorColor: Colors.white,
+            cursorColor: Colors.white,
+            style: const TextStyle(),
+            contextMenuBuilder: (
+              BuildContext context,
+              EditableTextState editableTextState,
+            ) {
+              return const Placeholder();
+            },
+          ),
+        ),
+      ),
+    );
+
+    final Offset position = textOffsetToPosition(tester, 0);
+    expect(find.byType(Placeholder), findsNothing);
+    await tester.tapAt(position, buttons: kSecondaryMouseButton, kind: PointerDeviceKind.mouse);
+    await tester.pump();
+    expect(find.byType(Placeholder), findsOneWidget);
+  }, skip: kIsWeb); // [intended] On web, we use native context menus for text fields.
 }
 
 class FakeTextSelectionGestureDetectorBuilderDelegate implements TextSelectionGestureDetectorBuilderDelegate {