Make sure that mouseenter/mouseleave fire on the correct element when doing delegation. Fixes #9069.

src/event.js

@@ -654,6 +654,9 @@ var withinElement = function( event ) {
 	// Check if mouse(over|out) are still within the same parent element
 	var parent = event.relatedTarget;
 
+	// set the correct event type
+	event.type = event.data;
+
 	// Firefox sometimes assigns relatedTarget a XUL element
 	// which we cannot access the parentNode property of
 	try {
@@ -663,15 +666,13 @@ var withinElement = function( event ) {
 		if ( parent && parent !== document && !parent.parentNode ) {
 			return;
 		}
+
 		// Traverse up the tree
 		while ( parent && parent !== this ) {
 			parent = parent.parentNode;
 		}
 
 		if ( parent !== this ) {
-			// set the correct event type
-			event.type = event.data;
-
 			// handle event if we actually just moused on to a non sub-element
 			jQuery.event.handle.apply( this, arguments );
 		}

test/delegatetest.html

@@ -184,6 +184,16 @@
 	</tr>
         </table>
 	
+	<h1>Mouseleave Tests</h1>
+
+	<div class="out" style="margin:20px; border:1px solid #000; background: red;">
+    	<p>Count mouse leave event</p>
+    	<div class="in" style="background: green; margin: 10px auto; width: 50%;">
+        	<p>mouse over here should not trigger the counter.</p>
+    	</div>
+    	<p>0</p>
+	</div>
+
 	<ul id="log"></ul>
 
         <script type='text/javascript'>
@@ -270,6 +280,10 @@
 		jQuery("#boundSubmit").blink();
 	});
 
+var n = 0;
+$("div.out").live("mouseleave", function() {
+    $("p:last", this).text(++n);
+});
         </script>
     </body>
 </html>