Update localization of shortcut labels in menus (#116681)

* Fix Menu shortcut labels

* Remove invalid localizations

* Add more localization for Shift

* Add generated localizations

* Fix Test

packages/flutter/lib/src/material/material_localizations.dart

@@ -583,6 +583,9 @@ abstract class MaterialLocalizations {
   /// The shortcut label for the keyboard key [LogicalKeyboardKey.select].
   String get keyboardKeySelect;
 
+  /// The shortcut label for the keyboard key [LogicalKeyboardKey.shift].
+  String get keyboardKeyShift;
+
   /// The shortcut label for the keyboard key [LogicalKeyboardKey.space].
   String get keyboardKeySpace;
 
@@ -1321,6 +1324,9 @@ class DefaultMaterialLocalizations implements MaterialLocalizations {
   @override
   String get keyboardKeySelect => 'Select';
 
+  @override
+  String get keyboardKeyShift => 'Shift';
+
   @override
   String get keyboardKeySpace => 'Space';
 }

packages/flutter/lib/src/material/menu_anchor.dart

@@ -1974,9 +1974,6 @@ class _LocalizedShortcutLabeler {
     LogicalKeyboardKey.arrowUp: '↑',
     LogicalKeyboardKey.arrowDown: '↓',
     LogicalKeyboardKey.enter: '↵',
-    LogicalKeyboardKey.shift: '⇧',
-    LogicalKeyboardKey.shiftLeft: '⇧',
-    LogicalKeyboardKey.shiftRight: '⇧',
   };
 
   static final Set<LogicalKeyboardKey> _modifiers = <LogicalKeyboardKey>{
@@ -2007,15 +2004,32 @@ class _LocalizedShortcutLabeler {
   /// Returns the label to be shown to the user in the UI when a
   /// [MenuSerializableShortcut] is used as a keyboard shortcut.
   ///
-  /// To keep the representation short, this will return graphical key
-  /// representations when it can. For instance, the default
-  /// [LogicalKeyboardKey.shift] will return '⇧', and the arrow keys will return
-  /// arrows. When [defaultTargetPlatform] is [TargetPlatform.macOS] or
-  /// [TargetPlatform.iOS], the key [LogicalKeyboardKey.meta] will show as '⌘',
-  /// [LogicalKeyboardKey.control] will show as '˄', and
-  /// [LogicalKeyboardKey.alt] will show as '⌥'.
+  /// When [defaultTargetPlatform] is [TargetPlatform.macOS] or
+  /// [TargetPlatform.iOS], this will return graphical key representations when
+  /// it can. For instance, the default [LogicalKeyboardKey.shift] will return
+  /// '⇧', and the arrow keys will return arrows. The key
+  /// [LogicalKeyboardKey.meta] will show as '⌘', [LogicalKeyboardKey.control]
+  /// will show as '˄', and [LogicalKeyboardKey.alt] will show as '⌥'.
+  ///
+  /// The keys are joined by spaces on macOS and iOS, and by "+" on other
+  /// platforms.
   String getShortcutLabel(MenuSerializableShortcut shortcut, MaterialLocalizations localizations) {
     final ShortcutSerialization serialized = shortcut.serializeForMenu();
+    final String keySeparator;
+    switch (defaultTargetPlatform) {
+      case TargetPlatform.iOS:
+      case TargetPlatform.macOS:
+        // Use "⌃ ⇧ A" style on macOS and iOS.
+        keySeparator = ' ';
+        break;
+      case TargetPlatform.android:
+      case TargetPlatform.fuchsia:
+      case TargetPlatform.linux:
+      case TargetPlatform.windows:
+        // Use "Ctrl+Shift+A" style.
+        keySeparator = '+';
+        break;
+    }
     if (serialized.trigger != null) {
       final List<String> modifiers = <String>[];
       final LogicalKeyboardKey trigger = serialized.trigger!;
@@ -2051,7 +2065,7 @@ class _LocalizedShortcutLabeler {
       return <String>[
         ...modifiers,
         if (shortcutTrigger != null && shortcutTrigger.isNotEmpty) shortcutTrigger,
-      ].join(' ');
+      ].join(keySeparator);
     } else if (serialized.character != null) {
       return serialized.character!;
     }
@@ -2166,7 +2180,16 @@ class _LocalizedShortcutLabeler {
     if (modifier == LogicalKeyboardKey.shift ||
         modifier == LogicalKeyboardKey.shiftLeft ||
         modifier == LogicalKeyboardKey.shiftRight) {
-      return _shortcutGraphicEquivalents[LogicalKeyboardKey.shift]!;
+      switch (defaultTargetPlatform) {
+        case TargetPlatform.android:
+        case TargetPlatform.fuchsia:
+        case TargetPlatform.linux:
+        case TargetPlatform.windows:
+          return localizations.keyboardKeyShift;
+        case TargetPlatform.iOS:
+        case TargetPlatform.macOS:
+          return '⇧';
+      }
     }
     throw ArgumentError('Keyboard key ${modifier.keyLabel} is not a modifier.');
   }

packages/flutter/test/material/localizations_test.dart

@@ -120,6 +120,7 @@ void main() {
     expect(localizations.keyboardKeyPrintScreen, isNotNull);
     expect(localizations.keyboardKeyScrollLock, isNotNull);
     expect(localizations.keyboardKeySelect, isNotNull);
+    expect(localizations.keyboardKeyShift, isNotNull);
     expect(localizations.keyboardKeySpace, isNotNull);
     expect(localizations.currentDateLabel, isNotNull);
 

packages/flutter/test/material/menu_anchor_test.dart

@@ -1607,23 +1607,23 @@ void main() {
         case TargetPlatform.fuchsia:
         case TargetPlatform.linux:
           mnemonic0 = tester.widget(findMnemonic(TestMenu.subSubMenu110.label));
-          expect(mnemonic0.data, equals('Ctrl A'));
+          expect(mnemonic0.data, equals('Ctrl+A'));
           mnemonic1 = tester.widget(findMnemonic(TestMenu.subSubMenu111.label));
-          expect(mnemonic1.data, equals('⇧ B'));
+          expect(mnemonic1.data, equals('Shift+B'));
           mnemonic2 = tester.widget(findMnemonic(TestMenu.subSubMenu112.label));
-          expect(mnemonic2.data, equals('Alt C'));
+          expect(mnemonic2.data, equals('Alt+C'));
           mnemonic3 = tester.widget(findMnemonic(TestMenu.subSubMenu113.label));
-          expect(mnemonic3.data, equals('Meta D'));
+          expect(mnemonic3.data, equals('Meta+D'));
           break;
         case TargetPlatform.windows:
           mnemonic0 = tester.widget(findMnemonic(TestMenu.subSubMenu110.label));
-          expect(mnemonic0.data, equals('Ctrl A'));
+          expect(mnemonic0.data, equals('Ctrl+A'));
           mnemonic1 = tester.widget(findMnemonic(TestMenu.subSubMenu111.label));
-          expect(mnemonic1.data, equals('⇧ B'));
+          expect(mnemonic1.data, equals('Shift+B'));
           mnemonic2 = tester.widget(findMnemonic(TestMenu.subSubMenu112.label));
-          expect(mnemonic2.data, equals('Alt C'));
+          expect(mnemonic2.data, equals('Alt+C'));
           mnemonic3 = tester.widget(findMnemonic(TestMenu.subSubMenu113.label));
-          expect(mnemonic3.data, equals('Win D'));
+          expect(mnemonic3.data, equals('Win+D'));
           break;
         case TargetPlatform.iOS:
         case TargetPlatform.macOS:
@@ -2146,24 +2146,26 @@ void main() {
       String expectedMeta;
       String expectedCtrl;
       String expectedAlt;
+      String expectedSeparator;
+      String expectedShift;
       switch (defaultTargetPlatform) {
         case TargetPlatform.android:
         case TargetPlatform.fuchsia:
         case TargetPlatform.linux:
-          expectedCtrl = 'Ctrl';
-          expectedMeta = 'Meta';
-          expectedAlt = 'Alt';
-          break;
         case TargetPlatform.windows:
           expectedCtrl = 'Ctrl';
-          expectedMeta = 'Win';
+          expectedMeta = defaultTargetPlatform == TargetPlatform.windows ? 'Win' : 'Meta';
           expectedAlt = 'Alt';
+          expectedShift = 'Shift';
+          expectedSeparator = '+';
           break;
         case TargetPlatform.iOS:
         case TargetPlatform.macOS:
           expectedCtrl = '⌃';
           expectedMeta = '⌘';
           expectedAlt = '⌥';
+          expectedShift = '⇧';
+          expectedSeparator = ' ';
           break;
       }
 
@@ -2174,7 +2176,7 @@ void main() {
         shift: true,
         alt: true,
       );
-      final String allExpected = '$expectedAlt $expectedCtrl $expectedMeta ⇧ A';
+      final String allExpected = <String>[expectedAlt, expectedCtrl, expectedMeta, expectedShift, 'A'].join(expectedSeparator);
       const CharacterActivator charShortcuts = CharacterActivator('ñ');
       const String charExpected = 'ñ';
       await tester.pumpWidget(