Fix bug in isSimulatedMouseEnterLeaveEvent. [#1269 state:resolved] (Victor, Andrew Dupont)

Author: savetheclocktower

src/prototype/dom/event.js

@@ -1297,7 +1297,7 @@
     && 'onmouseleave' in docEl;
 
   function isSimulatedMouseEnterLeaveEvent(eventName) {
-    return MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
+    return !MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
      (eventName === 'mouseenter' || eventName === 'mouseleave');
   }