Reverts "Reland Native ios context menu (#143002) (#148238)" (#148254)

Reverts: flutter/flutter#148238
Initiated by: zanderso
Reason for reverting: Failures in post submit https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8748025189669617649/+/u/run_test.dart_for_web_canvaskit_tests_shard_and_subshard_3/stdout
Original PR Author: justinmc

Reviewed By: {hellohuanlin}

This change reverts the following previous change:
Reland of flutter/flutter#143002, which was reverted in flutter/flutter#148237 due to unresolved docs references. Not sure why those weren't caught in presubmit.

```
dartdoc:stdout: Generating docs for package flutter...
dartdoc:stderr:   error: unresolved doc reference [TextInput.showSystemContextMenu]
dartdoc:stderr:     from widgets.MediaQueryData.supportsShowingSystemContextMenu: (file:///b/s/w/ir/x/w/flutter/packages/flutter/lib/src/widgets/media_query.dart:579:14)
dartdoc:stderr:     in documentation inherited from widgets.MediaQueryData.supportsShowingSystemContextMenu: (file:///b/s/w/ir/x/w/flutter/packages/flutter/lib/src/widgets/media_query.dart:579:14)
dartdoc:stderr:   error: unresolved doc reference [showSystemContextMenu]
dartdoc:stderr:     from services.SystemContextMenuController.hide: (file:///b/s/w/ir/x/w/flutter/packages/flutter/lib/src/services/text_input.dart:2554:16)
dartdoc:stderr:   error: unresolved doc reference [hideSystemContextMenu]
dartdoc:stderr:     from services.SystemContextMenuController.show: (file:///b/s/w/ir/x/w/flutter/packages/flutter/lib/src/services/text_input.dart:2509:16)
```

Author: auto-submit[bot]

examples/api/lib/widgets/system_context_menu/system_context_menu.0.dart

@@ -357,23 +357,15 @@ mixin ServicesBinding on BindingBase, SchedulerBinding {
 
   Future<dynamic> _handlePlatformMessage(MethodCall methodCall) async {
     final String method = methodCall.method;
+    assert(method == 'SystemChrome.systemUIChange' || method == 'System.requestAppExit');
     switch (method) {
-      // Called when the system dismisses the system context menu, such as when
-      // the user taps outside the menu. Not called when Flutter shows a new
-      // system context menu while an old one is still visible.
-      case 'ContextMenu.onDismissSystemContextMenu':
-        for (final SystemContextMenuClient client in _systemContextMenuClients) {
-          client.handleSystemHide();
-        }
       case 'SystemChrome.systemUIChange':
         final List<dynamic> args = methodCall.arguments as List<dynamic>;
         if (_systemUiChangeCallback != null) {
           await _systemUiChangeCallback!(args[0] as bool);
         }
       case 'System.requestAppExit':
         return <String, dynamic>{'response': (await handleRequestAppExit()).name};
-      default:
-        throw AssertionError('Method "$method" not handled.');
     }
   }
 
@@ -518,19 +510,6 @@ mixin ServicesBinding on BindingBase, SchedulerBinding {
   Future<void> initializationComplete() async {
     await SystemChannels.platform.invokeMethod('System.initializationComplete');
   }
-
-  final Set<SystemContextMenuClient> _systemContextMenuClients = <SystemContextMenuClient>{};
-
-  /// Registers a [SystemContextMenuClient] that will receive system context
-  /// menu calls from the engine.
-  static void registerSystemContextMenuClient(SystemContextMenuClient client) {
-    instance._systemContextMenuClients.add(client);
-  }
-
-  /// Unregisters a [SystemContextMenuClient] so that it is no longer called.
-  static void unregisterSystemContextMenuClient(SystemContextMenuClient client) {
-    instance._systemContextMenuClients.remove(client);
-  }
 }
 
 /// Signature for listening to changes in the [SystemUiMode].
@@ -609,23 +588,3 @@ class _DefaultBinaryMessenger extends BinaryMessenger {
     }
   }
 }
-
-/// An interface to receive calls related to the system context menu from the
-/// engine.
-///
-/// Currently this is only supported on iOS 16+.
-///
-/// See also:
-///  * [SystemContextMenuController], which uses this to provide a fully
-///    featured way to control the system context menu.
-///  * [MediaQuery.maybeSupportsShowingSystemContextMenu], which indicates
-///    whether the system context menu is supported.
-///  * [SystemContextMenu], which provides a widget interface for displaying the
-///    system context menu.
-mixin SystemContextMenuClient {
-  /// Handles the system hiding a context menu.
-  ///
-  /// This is called for all instances of [SystemContextMenuController], so it's
-  /// not guaranteed that this instance was the one that was hidden.
-  void handleSystemHide();
-}

examples/api/test/widgets/system_context_menu/system_context_menu.0_test.dart

@@ -17,7 +17,6 @@ import 'package:flutter/foundation.dart';
 import 'package:vector_math/vector_math_64.dart' show Matrix4;
 
 import 'autofill.dart';
-import 'binding.dart';
 import 'clipboard.dart' show Clipboard;
 import 'keyboard_inserted_content.dart';
 import 'message_codec.dart';
@@ -1809,7 +1808,7 @@ class TextInput {
 
   Future<dynamic> _handleTextInputInvocation(MethodCall methodCall) async {
     final String method = methodCall.method;
-    switch (method) {
+    switch (methodCall.method) {
       case 'TextInputClient.focusElement':
         final List<dynamic> args = methodCall.arguments as List<dynamic>;
         _scribbleClients[args[0]]?.onScribbleFocus(Offset((args[1] as num).toDouble(), (args[2] as num).toDouble()));
@@ -2404,178 +2403,3 @@ class _PlatformTextInputControl with TextInputControl {
     );
   }
 }
-
-/// Allows access to the system context menu.
-///
-/// The context menu is the menu that appears, for example, when doing text
-/// selection. Flutter typically draws this menu itself, but this class deals
-/// with the platform-rendered context menu.
-///
-/// Only one instance can be visible at a time. Calling [show] while the system
-/// context menu is already visible will hide it and show it again at the new
-/// [Rect]. An instance that is hidden is informed via [onSystemHide].
-///
-/// Currently this system context menu is bound to text input. The buttons that
-/// are shown and the actions they perform are dependent on the currently
-/// active [TextInputConnection]. Using this without an active
-/// [TextInputConnection] is a noop.
-///
-/// Call [dispose] when no longer needed.
-///
-/// See also:
-///
-///  * [ContextMenuController], which controls Flutter-drawn context menus.
-///  * [SystemContextMenu], which wraps this functionality in a widget.
-///  * [MediaQuery.maybeSupportsShowingSystemContextMenu], which indicates
-///    whether the system context menu is supported.
-class SystemContextMenuController with SystemContextMenuClient {
-  /// Creates an instance of [SystemContextMenuController].
-  ///
-  /// Not shown until [show] is called.
-  SystemContextMenuController({
-    this.onSystemHide,
-  }) {
-    ServicesBinding.registerSystemContextMenuClient(this);
-  }
-
-  /// Called when the system has hidden the context menu.
-  ///
-  /// For example, tapping outside of the context menu typically causes the
-  /// system to hide it directly. Flutter is made aware that the context menu is
-  /// no longer visible through this callback.
-  ///
-  /// This is not called when [show]ing a new system context menu causes another
-  /// to be hidden.
-  final VoidCallback? onSystemHide;
-
-  static const MethodChannel _channel = SystemChannels.platform;
-
-  static SystemContextMenuController? _lastShown;
-
-  /// The target [Rect] that was last given to [show].
-  ///
-  /// Null if [show] has not been called.
-  Rect? _lastTargetRect;
-
-  /// True when the instance most recently [show]n has been hidden by the
-  /// system.
-  bool _hiddenBySystem = false;
-
-  bool get _isVisible => this == _lastShown && !_hiddenBySystem;
-
-  /// After calling [dispose], this instance can no longer be used.
-  bool _isDisposed = false;
-
-  // Begin SystemContextMenuClient.
-
-  @override
-  void handleSystemHide() {
-    assert(!_isDisposed);
-    // If this instance wasn't being shown, then it wasn't the instance that was
-    // hidden.
-    if (!_isVisible) {
-      return;
-    }
-    if (_lastShown == this) {
-      _lastShown = null;
-    }
-    _hiddenBySystem = true;
-    onSystemHide?.call();
-  }
-
-  // End SystemContextMenuClient.
-
-  /// Shows the system context menu anchored on the given [Rect].
-  ///
-  /// The [Rect] represents what the context menu is pointing to. For example,
-  /// for some text selection, this would be the selection [Rect].
-  ///
-  /// There can only be one system context menu visible at a time. Calling this
-  /// while another system context menu is already visible will remove the old
-  /// menu before showing the new menu.
-  ///
-  /// Currently this system context menu is bound to text input. The buttons
-  /// that are shown and the actions they perform are dependent on the
-  /// currently active [TextInputConnection]. Using this without an active
-  /// [TextInputConnection] will be a noop.
-  ///
-  /// This is only supported on iOS 16.0 and later.
-  ///
-  /// See also:
-  ///
-  ///  * [hide], which hides the menu shown by this method.
-  ///  * [MediaQuery.supportsShowingSystemContextMenu], which indicates whether
-  ///    this method is supported on the current platform.
-  Future<void> show(Rect targetRect) {
-    assert(!_isDisposed);
-    assert(
-      TextInput._instance._currentConnection != null,
-      'Currently, the system context menu can only be shown for an active text input connection',
-    );
-
-    // Don't show the same thing that's already being shown.
-    if (_lastShown != null && _lastShown!._isVisible && _lastShown!._lastTargetRect == targetRect) {
-      return Future<void>.value();
-    }
-
-    assert(
-      _lastShown == null || _lastShown == this || !_lastShown!._isVisible,
-      'Attempted to show while another instance was still visible.',
-    );
-
-    _lastTargetRect = targetRect;
-    _lastShown = this;
-    _hiddenBySystem = false;
-    return _channel.invokeMethod<Map<String, dynamic>>(
-      'ContextMenu.showSystemContextMenu',
-      <String, dynamic>{
-        'targetRect': <String, double>{
-          'x': targetRect.left,
-          'y': targetRect.top,
-          'width': targetRect.width,
-          'height': targetRect.height,
-        },
-      },
-    );
-  }
-
-  /// Hides this system context menu.
-  ///
-  /// If this hasn't been shown, or if another instance has hidden this menu,
-  /// does nothing.
-  ///
-  /// Currently this is only supported on iOS 16.0 and later.
-  ///
-  /// See also:
-  ///
-  ///  * [show], which shows the menu hidden by this method.
-  ///  * [MediaQuery.supportsShowingSystemContextMenu], which indicates whether
-  ///    the system context menu is supported on the current platform.
-  Future<void> hide() async {
-    assert(!_isDisposed);
-    // This check prevents a given instance from accidentally hiding some other
-    // instance, since only one can be visible at a time.
-    if (this != _lastShown) {
-      return;
-    }
-    _lastShown = null;
-    // This may be called unnecessarily in the case where the user has already
-    // hidden the menu (for example by tapping the screen).
-    return _channel.invokeMethod<void>(
-      'ContextMenu.hideSystemContextMenu',
-    );
-  }
-
-  @override
-  String toString() {
-    return 'SystemContextMenuController(onSystemHide=$onSystemHide, _hiddenBySystem=$_hiddenBySystem, _isVisible=$_isVisible, _isDiposed=$_isDisposed)';
-  }
-
-  /// Used to release resources when this instance will never be used again.
-  void dispose() {
-    assert(!_isDisposed);
-    hide();
-    ServicesBinding.unregisterSystemContextMenuClient(this);
-    _isDisposed = true;
-  }
-}