Fix opacity not being animated on Text component

Reviewed By: shergin

Differential Revision: D21523725

fbshipit-source-id: 80be40fd1314b7e1cbaa827ca52f917ba5bc916e

ReactCommon/fabric/components/text/basetext/BaseTextProps.h

@@ -26,7 +26,7 @@ class BaseTextProps {
 
 #pragma mark - Props
 
-  const TextAttributes textAttributes{};
+  TextAttributes textAttributes{};
 
 #pragma mark - DebugStringConvertible (partially)
 

ReactCommon/fabric/components/text/paragraph/ParagraphProps.cpp

@@ -28,7 +28,14 @@ ParagraphProps::ParagraphProps(
           rawProps,
           "selectable",
           sourceProps.isSelectable,
-          {})){};
+          {})) {
+  /*
+   * These props are applied to `View`, therefore they must not be a part of
+   * base text attributes.
+   */
+  textAttributes.opacity = std::numeric_limits<Float>::quiet_NaN();
+  textAttributes.backgroundColor = {};
+};
 
 #pragma mark - DebugStringConvertible