Bug 936495 - Reorder is-this-listener-added-already-to-ELM check , r=bz

content/events/src/nsEventListenerManager.cpp

@@ -228,10 +228,11 @@ nsEventListenerManager::AddEventListenerInternal(
   uint32_t count = mListeners.Length();
   for (uint32_t i = 0; i < count; i++) {
     ls = &mListeners.ElementAt(i);
-    if (ls->mListener == aListener &&
-        ls->mListenerIsHandler == aHandler &&
+    // mListener == aListener is the last one, since it can be a bit slow.
+    if (ls->mListenerIsHandler == aHandler &&
         ls->mFlags == aFlags &&
-        EVENT_TYPE_EQUALS(ls, aType, aTypeAtom, aTypeString, aAllEvents)) {
+        EVENT_TYPE_EQUALS(ls, aType, aTypeAtom, aTypeString, aAllEvents) &&
+        ls->mListener == aListener) {
       return;
     }
   }