Prevent measuring text in RCTShadowText child nodes

Summary: We only measure text at the root node, we shouldn't be trying to build a text storage later on for tree lower in the shadow node tree.

Reviewed By: nicklockwood

Differential Revision: D3212614

fb-gh-sync-id: 574fa7f2c029ca9ad2d5fabe7bbb148157f85ca7
fbshipit-source-id: 574fa7f2c029ca9ad2d5fabe7bbb148157f85ca7

Libraries/Text/RCTShadowText.m

@@ -87,6 +87,10 @@ static css_dim_t RCTMeasure(void *context, float width, css_measure_mode_t width
 - (NSDictionary<NSString *, id> *)processUpdatedProperties:(NSMutableSet<RCTApplierBlock> *)applierBlocks
                                           parentProperties:(NSDictionary<NSString *, id> *)parentProperties
 {
+  if ([[self reactSuperview] isKindOfClass:[RCTShadowText class]]) {
+    return parentProperties;
+  }
+
   parentProperties = [super processUpdatedProperties:applierBlocks
                                     parentProperties:parentProperties];