Fixed DEV mode issue with synchronously caused event (i.e. by accessed ref) of the same type within a handler calling an original handler too (fixes facebook#8559)

Author: Andarist

Diff for: src/renderers/shared/utils/ReactErrorUtils.js

@@ -62,6 +62,15 @@ if (__DEV__) {
    * To help development we can get better devtools integration by simulating a
    * real browser event.
    */
+  var once = (fn) => {
+    var result;
+    return (...args) => {
+      if (!result) {
+        result = fn(...args);
+      }
+      return result;
+    };
+  };
   if (typeof window !== 'undefined' &&
       typeof window.dispatchEvent === 'function' &&
       typeof document !== 'undefined' &&
@@ -72,9 +81,7 @@ if (__DEV__) {
       func: (a: A) => void,
       a: A,
     ): void {
-      var boundFunc = function() {
-        func(a);
-      };
+      var boundFunc = once(() => func(a));
       var evtType = `react-${name}`;
       fakeNode.addEventListener(evtType, boundFunc, false);
       var evt = document.createEvent('Event');