ScrollView/TextInput: The amnesty of `scrollRectToVisible`

Reviewed By: javache

Differential Revision: D5414438

fbshipit-source-id: 45b6a32bc2584ed99efd1514d724e2b5ca29d8e9

React/Views/RCTScrollView.m

@@ -214,9 +214,21 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
   }
 }
 
-- (void)scrollRectToVisible:(__unused CGRect)rect animated:(__unused BOOL)animated
+- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated
 {
-  // noop
+  // Limiting scroll area to an area where we actually have content.
+  CGSize contentSize = self.contentSize;
+  UIEdgeInsets contentInset = self.contentInset;
+  CGSize fullSize = CGSizeMake(
+    contentSize.width + contentInset.left + contentInset.right,
+    contentSize.height + contentInset.top + contentInset.bottom);
+
+  rect = CGRectIntersection((CGRect){CGPointZero, fullSize}, rect);
+  if (CGRectIsNull(rect)) {
+    return;
+  }
+
+  [super scrollRectToVisible:rect animated:animated];
 }
 
 /**