feat: use usedRect in layout subviews

Author: IvanIhnatsiuk

ios/EnrichedTextInputView.h

@@ -40,6 +40,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (NSArray<NSNumber *> *)getPresentStyleTypesFrom:(NSArray<NSNumber *> *)types
                                             range:(NSRange)range;
 - (CGSize)measureInitialSizeWithMaxWidth:(CGFloat)maxWidth;
+- (void)commitSize:(CGSize)size;
 @end
 
 NS_ASSUME_NONNULL_END

ios/EnrichedTextInputView.mm

@@ -673,16 +673,15 @@ - (void)updateState:(State::Shared const &)state
   // componentView) so we need to run a single height calculation for any
   // initial values
   if (oldState == nullptr) {
-    [self measureAndCommitSize];
+    [self commitSize:textView.textContainer.size];
   }
 }
 
-- (void)measureAndCommitSize {
+- (void)commitSize:(CGSize)size {
   if (_state == nullptr) {
     return;
   }
-  CGSize size =
-      [self measureInitialSizeWithMaxWidth:textView.bounds.size.width];
+
   auto selfRef = wrapManagedObjectWeakly(self);
   facebook::react::Size newSize{.width = size.width, .height = size.height};
   _state->updateState(
@@ -1366,8 +1365,6 @@ - (void)anyTextMayHaveBeenModified {
     }
   }
 
-  // update height on each character change
-  [self measureAndCommitSize];
   // update active styles as well
   [self tryUpdatingActiveStyles];
 }

ios/inputTextView/InputTextView.mm

@@ -4,8 +4,19 @@
 #import "TextInsertionUtils.h"
 #import <UniformTypeIdentifiers/UniformTypeIdentifiers.h>
 
+// for some reason UIKit may produce different size with the same text
+// the difference is always ~0.5
+static const CGFloat Epsilon = 0.5;
+
+static inline BOOL CGSizeAlmostEqual(CGSize firstSize, CGSize secondSize,
+                                     CGFloat epsilon) {
+  return fabs(firstSize.width - secondSize.width) < epsilon &&
+         fabs(firstSize.height - secondSize.height) < epsilon;
+}
+
 @implementation InputTextView {
   UILabel *placeholderView;
+  CGSize _lastCommittedSize;
 };
 
 - (instancetype)initWithFrame:(CGRect)frame {
@@ -18,6 +29,7 @@ - (instancetype)initWithFrame:(CGRect)frame {
     self.textContainer.lineFragmentPadding = 0;
     self.scrollEnabled = YES;
     self.scrollsToTop = NO;
+    _lastCommittedSize = CGSizeZero;
   }
   return self;
 }
@@ -212,6 +224,15 @@ - (void)layoutSubviews {
       [placeholderView sizeThatFits:textFrame.size].height;
   textFrame.size.height = MIN(placeholderHeight, textFrame.size.height);
   placeholderView.frame = textFrame;
+  CGSize newSize =
+      [self.layoutManager usedRectForTextContainer:self.textContainer].size;
+  if (CGSizeAlmostEqual(newSize, _lastCommittedSize, Epsilon)) {
+    return;
+  }
+
+  _lastCommittedSize = newSize;
+
+  [_input commitSize:newSize];
 }
 
 @end