[ios][autocorrection]disable auto-correction highlight in iOS 17 (flutter/engine#44176)

This PR disables the "auto-correction highlight" feature in iOS 17. 

This feature was introduced in https://github.com/flutter/flutter/pull/45354 and https://github.com/flutter/engine/pull/13959/ (CC: @LongCatIsLooong who was the original author)

I have created [a new issue](https://github.com/flutter/flutter/issues/131622) to find other approaches to re-enable this feature. 

**Note that "auto-correction" itself still works, it's only the "highlight" part is disabled:**

- iOS 16 with highlight:
https://github.com/flutter/engine/assets/41930132/2fe7bbf6-f2db-4212-a020-e420ad8dd5e6

- iOS 17 without highlight:
https://github.com/flutter/engine/assets/41930132/34f34743-6bef-4e93-80d2-d04c92ba59bf

## Why disable this feature?

The original PR uses `UITextInput::firstRectForRange` API for auto-correction, since Apple does not provide any other API when auto-correction should show up, so the original PR used this API as a workaround. 

In iOS 17, Apple changed a few `UITextInput` behaviors:  
- UIKit does not query `UITextInput::firstRectForRange` for text range of the auto-corrected word any more. 
- But instead, it repeatedly queries every single character of the current word (after entering or deleting a character), regardless whether the word should be auto-corrected or not. 

I have tried all other `UITextInput` APIs that takes a text range, and none are suitable for auto-correction feature. As a result, I have to disable this feature for iOS 17 for now. 

*List which issues are fixed by this PR. You must list at least one issue.*

Fixes https://github.com/flutter/flutter/issues/128406

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm

@@ -1632,10 +1632,21 @@ static BOOL IsSelectionRectBoundaryCloserToPoint(CGPoint point,
 
   if (_scribbleInteractionStatus == FlutterScribbleInteractionStatusNone &&
       _scribbleFocusStatus == FlutterScribbleFocusStatusUnfocused) {
-    [self.textInputDelegate flutterTextInputView:self
-            showAutocorrectionPromptRectForStart:start
-                                             end:end
-                                      withClient:_textInputClient];
+    if (@available(iOS 17.0, *)) {
+      // Disable auto-correction highlight feature for iOS 17+.
+      // In iOS 17+, whenever a character is inserted or deleted, the system will always query
+      // the rect for every single character of the current word.
+      // GitHub Issue: https://github.com/flutter/flutter/issues/128406
+    } else {
+      // This tells the framework to show the highlight for incorrectly spelled word that is
+      // about to be auto-corrected.
+      // There is no other UITextInput API that informs about the auto-correction highlight.
+      // So we simply add the call here as a workaround.
+      [self.textInputDelegate flutterTextInputView:self
+              showAutocorrectionPromptRectForStart:start
+                                               end:end
+                                        withClient:_textInputClient];
+    }
   }
 
   NSUInteger first = start;

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPluginTest.mm

@@ -313,15 +313,22 @@ FLUTTER_ASSERT_ARC
   XCTAssertNil(textInputPlugin.activeView.inputViewController);
 }
 
-- (void)testAutocorrectionPromptRectAppears {
+- (void)testAutocorrectionPromptRectAppearsBeforeIOS17AndDoesNotAppearAfterIOS17 {
   FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];
   [inputView firstRectForRange:[FlutterTextRange rangeWithNSRange:NSMakeRange(0, 1)]];
 
-  // Verify behavior.
-  OCMVerify([engine flutterTextInputView:inputView
-      showAutocorrectionPromptRectForStart:0
-                                       end:1
-                                withClient:0]);
+  if (@available(iOS 17.0, *)) {
+    // Auto-correction prompt is disabled in iOS 17+.
+    OCMVerify(never(), [engine flutterTextInputView:inputView
+                           showAutocorrectionPromptRectForStart:0
+                                                            end:1
+                                                     withClient:0]);
+  } else {
+    OCMVerify([engine flutterTextInputView:inputView
+        showAutocorrectionPromptRectForStart:0
+                                         end:1
+                                  withClient:0]);
+  }
 }
 
 - (void)testIgnoresSelectionChangeIfSelectionIsDisabled {
@@ -353,6 +360,11 @@ FLUTTER_ASSERT_ARC
 }
 
 - (void)testAutocorrectionPromptRectDoesNotAppearDuringScribble {
+  // Auto-correction prompt is disabled in iOS 17+.
+  if (@available(iOS 17.0, *)) {
+    return;
+  }
+
   if (@available(iOS 14.0, *)) {
     FlutterTextInputView* inputView = [[FlutterTextInputView alloc] initWithOwner:textInputPlugin];