Fix TextInput onContentSizeChange event being dispatched only once on iOS (facebook#50782)

Summary:
Pull Request resolved: facebook#50782

Changelog: [IOS][FIXED] Fix TextInput `onContentSizeChange` event being dispatched only once on iOS on the new architecture

Currently, the comparison to decide whether to send event happens between the content size before and after layout metrics update. Those values turn out to be the same in all but the first call.

This updates the logic to use the previously send values in the comparison.

Reviewed By: huntie

Differential Revision: D73182563

fbshipit-source-id: 3b764a89c1844e203001d75022a3295a3fd747f2

Author: j-piasecki

packages/react-native/React/Fabric/Mounting/ComponentViews/TextInput/RCTTextInputComponentView.mm

@@ -71,6 +71,7 @@ @implementation RCTTextInputComponentView {
   NSDictionary<NSAttributedStringKey, id> *_originalTypingAttributes;
 
   BOOL _hasInputAccessoryView;
+  CGSize _previousContentSize;
 }
 
 #pragma mark - UIView overrides
@@ -87,6 +88,7 @@ - (instancetype)initWithFrame:(CGRect)frame
     _comingFromJS = NO;
     _didMoveToWindow = NO;
     _originalTypingAttributes = [_backedTextInputView.typingAttributes copy];
+    _previousContentSize = CGSizeZero;
 
     [self addSubview:_backedTextInputView];
     [self initializeReturnKeyType];
@@ -336,16 +338,15 @@ - (void)updateState:(const State::Shared &)state oldState:(const State::Shared &
 - (void)updateLayoutMetrics:(const LayoutMetrics &)layoutMetrics
            oldLayoutMetrics:(const LayoutMetrics &)oldLayoutMetrics
 {
-  CGSize previousContentSize = _backedTextInputView.contentSize;
-
   [super updateLayoutMetrics:layoutMetrics oldLayoutMetrics:oldLayoutMetrics];
 
   _backedTextInputView.frame =
       UIEdgeInsetsInsetRect(self.bounds, RCTUIEdgeInsetsFromEdgeInsets(layoutMetrics.borderWidth));
   _backedTextInputView.textContainerInset =
       RCTUIEdgeInsetsFromEdgeInsets(layoutMetrics.contentInsets - layoutMetrics.borderWidth);
 
-  if (!CGSizeEqualToSize(previousContentSize, _backedTextInputView.contentSize) && _eventEmitter) {
+  if (!CGSizeEqualToSize(_previousContentSize, _backedTextInputView.contentSize) && _eventEmitter) {
+    _previousContentSize = _backedTextInputView.contentSize;
     static_cast<const TextInputEventEmitter &>(*_eventEmitter).onContentSizeChange([self _textInputMetrics]);
   }
 }