Fix NaN value comparison for paragraph props diffing (facebook#51289)

Summary:
Pull Request resolved: facebook#51289

Because NaN is always different from NaN, these Float props were always included in the diff when set to NaN. This checks for the specific case where both the current and the prev prop value is NaN.

Changelog: [Internal]

Reviewed By: sammy-SC

Differential Revision: D74647582

fbshipit-source-id: 7941dcc6a96bed13c2e43232606bd1f9a9179606

Author: Nick Lefever

packages/react-native/ReactCommon/react/renderer/components/text/ParagraphProps.cpp

@@ -186,18 +186,21 @@ folly::dynamic ParagraphProps::getDiffProps(const Props* prevProps) const {
     result["adjustsFontSizeToFit"] = paragraphAttributes.adjustsFontSizeToFit;
   }
 
-  if (paragraphAttributes.minimumFontScale !=
-      oldProps->paragraphAttributes.minimumFontScale) {
+  if (!floatEquality(
+          paragraphAttributes.minimumFontScale,
+          oldProps->paragraphAttributes.minimumFontScale)) {
     result["minimumFontScale"] = paragraphAttributes.minimumFontScale;
   }
 
-  if (paragraphAttributes.minimumFontSize !=
-      oldProps->paragraphAttributes.minimumFontSize) {
+  if (!floatEquality(
+          paragraphAttributes.minimumFontSize,
+          oldProps->paragraphAttributes.minimumFontSize)) {
     result["minimumFontSize"] = paragraphAttributes.minimumFontSize;
   }
 
-  if (paragraphAttributes.maximumFontSize !=
-      oldProps->paragraphAttributes.maximumFontSize) {
+  if (!floatEquality(
+          paragraphAttributes.maximumFontSize,
+          oldProps->paragraphAttributes.maximumFontSize)) {
     result["maximumFontSize"] = paragraphAttributes.maximumFontSize;
   }