refactor $.each model

Author: erik-krogh

javascript/ql/src/semmle/javascript/DOM.qll

@@ -307,12 +307,8 @@ module DOM {
         )
         or
         // A `this` node from a callback given to a `$().each(callback)` call.
-        exists(DataFlow::MethodCallNode eachCall |
-          eachCall.getMethodName() = "each" and
-          eachCall.getReceiver().getALocalSource() = JQuery::objectRef() // purposely not using JQuery::MethodCall to avoid `jquery.each()`. 
-        |
-          this = DataFlow::thisNode(eachCall.getCallback(0).getFunction())
-        )
+        // purposely not using JQuery::MethodCall to avoid `jquery.each()`. 
+        this = DataFlow::thisNode(JQuery::objectRef().getAMethodCall("each").getCallback(0).getFunction())
       }
     }
   }