[ios][autocorrection]disable auto-correction highlight in iOS 17

shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm

@@ -1632,10 +1632,21 @@ - (CGRect)firstRectForRange:(UITextRange*)range {
 
   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;

shell/platform/darwin/ios/framework/Source/FlutterTextInputPluginTest.mm

@@ -313,15 +313,22 @@ - (void)testSettingKeyboardTypeNoneDisablesSystemKeyboard {
   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 @@ - (void)testIgnoresSelectionChangeIfSelectionIsDisabled {
 }
 
 - (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];