Event: Fix #14544. Remove elem from event handle, close gh-1400.

This also reduces memory leaks if the element is removed without cleaning
events (e.g with native DOM operations).

Not pickable into the 1.x branch because oldIE still needs this.

src/event.js

@@ -72,12 +72,9 @@ jQuery.event = {
 			eventHandle = elemData.handle = function( e ) {
 				// Discard the second event of a jQuery.event.trigger() and
 				// when an event is called after a page has unloaded
-				return typeof jQuery !== strundefined && (!e || jQuery.event.triggered !== e.type) ?
-					jQuery.event.dispatch.apply( eventHandle.elem, arguments ) :
-					undefined;
+				return typeof jQuery !== strundefined && jQuery.event.triggered !== e.type ?
+					jQuery.event.dispatch.apply( elem, arguments ) : undefined;
 			};
-			// Add elem as a property of the handle fn to prevent a memory leak with IE non-native events
-			eventHandle.elem = elem;
 		}
 
 		// Handle multiple events separated by a space
@@ -146,8 +143,6 @@ jQuery.event = {
 			jQuery.event.global[ type ] = true;
 		}
 
-		// Nullify elem to prevent memory leaks in IE
-		elem = null;
 	},
 
 	// Detach an event or set of events from an element