Fixed a bug with positioning of nested views inside <Text>

Summary:
Fixing of recent regression in layout system.
Conseptually, a superview should define frames of child views.

Reviewed By: mmmulani

Differential Revision: D6980128

fbshipit-source-id: e267e966fd46af28db1d3d40939110040b74e33f

Author: shergin

Libraries/Text/Text/RCTTextShadowView.m

@@ -298,6 +298,11 @@ - (void)layoutSubviewsWithContext:(RCTLayoutContext)layoutContext
                             maximumSize:frame.size
                         layoutDirection:self.layoutMetrics.layoutDirection
                           layoutContext:localLayoutContext];
+
+      // Reinforcing a proper frame origin for the Shadow View.
+      RCTLayoutMetrics localLayoutMetrics = shadowView.layoutMetrics;
+      localLayoutMetrics.frame.origin = frame.origin;
+      [shadowView layoutWithMetrics:localLayoutMetrics layoutContext:localLayoutContext];
     }
   ];
 }