Improved stack/fiber type-check to avoid false negative match when inst._rootNodeID is 0

Author: Brian Vaughn

src/renderers/native/ReactNativeComponentTree.js

@@ -61,7 +61,9 @@ function getInstanceFromTag(tag) {
 
 function getTagFromInstance(inst) {
   // TODO (bvaughn) Clean up once Stack is deprecated
-  var tag = inst._rootNodeID || inst.stateNode._nativeTag;
+  var tag = typeof inst.tag !== 'number'
+    ? inst._rootNodeID
+    : inst.stateNode._nativeTag;
   invariant(tag, 'All native instances should have a tag.');
   return tag;
 }

src/renderers/native/ReactNativeGlobalResponderHandler.js

@@ -16,10 +16,10 @@ var ReactNativeGlobalResponderHandler = {
   onChange: function(from, to, blockNativeResponder) {
     if (to !== null) {
       // TODO (bvaughn) Clean up once Stack is deprecated
-      UIManager.setJSResponder(
-        to._rootNodeID || to.stateNode._nativeTag,
-        blockNativeResponder
-      );
+      var tag = typeof to.tag !== 'number'
+        ? to._rootNodeID
+        : to.stateNode._nativeTag;
+      UIManager.setJSResponder(tag, blockNativeResponder);
     } else {
       UIManager.clearJSResponder();
     }