Multiline <TextInput> was fixed to match layout logic of singlelined one

Summary: Now padding, border and intinsic sizes are computed same way as for singlelined text input.

Reviewed By: mmmulani

Differential Revision: D5075880

fbshipit-source-id: 1bc2fd479c13a003c717b1fc3d9c69f4639d4444

Libraries/Text/RCTUITextView.m

@@ -10,6 +10,7 @@
 #import "RCTUITextView.h"
 
 #import <React/UIView+React.h>
+#import <React/RCTUtils.h>
 
 @implementation RCTUITextView
 {
@@ -123,6 +124,21 @@ static UIColor *defaultPlaceholderTextColor()
 }
 
 - (CGSize)sizeThatFits:(CGSize)size
+{
+  // Returned fitting size depends on text size and placeholder size.
+  CGSize textSize = [self fixedSizeThatFits:size];
+
+  UIEdgeInsets padddingInsets = self.textContainerInset;
+  NSString *placeholderText = self.placeholderText ?: @"";
+  CGSize placeholderSize = [placeholderText sizeWithAttributes:@{NSFontAttributeName: self.font ?: defaultPlaceholderFont()}];
+  placeholderSize = CGSizeMake(RCTCeilPixelValue(placeholderSize.width), RCTCeilPixelValue(placeholderSize.height));
+  placeholderSize.width += padddingInsets.left + padddingInsets.right;
+  placeholderSize.height += padddingInsets.top + padddingInsets.bottom;
+
+  return CGSizeMake(MAX(textSize.width, placeholderSize.width), MAX(textSize.height, placeholderSize.height));
+}
+
+- (CGSize)fixedSizeThatFits:(CGSize)size
 {
   // UITextView on iOS 8 has a bug that automatically scrolls to the top
   // when calling `sizeThatFits:`. Use a copy so that self is not screwed up.