jquery event: Now using an internal argument to detect if bubbling on...

jquery event: Now using an internal argument to detect if bubbling on $.event.trigger. The other would fail when it receives an event object with target. Also, the target isn't nulled anymore.
In addition, there was a lot of code running O(n) during bubbling while not needed.

src/event.js

@@ -163,90 +163,85 @@ jQuery.event = {
 		}
 	},
 
-	trigger: function( event, data, elem) {
+	trigger: function( event, data, elem, bubbling /* internal */ ) {
 		// Event object or event type
 		var type = event.type || event;
 
-		event = typeof event === "object" ?
-			// jQuery.Event object
-			event[expando] ? event :
-			// Object literal
-			jQuery.extend( jQuery.Event(type), event ) :
-			// Just the event type (string)
-			jQuery.Event(type);
-
-		if ( type.indexOf("!") >= 0 ) {
-			event.type = type = type.slice(0, -1);
-			event.exclusive = true;
-		}
-			
-		// Handle a global trigger
-		if ( !elem ) {
-			// Don't bubble custom events when global (to avoid too much overhead)
-			event.stopPropagation();
-			// Only trigger if we've ever bound an event for it
-			if ( this.global[type] )
-				jQuery.each( jQuery.cache, function(){
-					if ( this.events && this.events[type] )
-						jQuery.event.trigger( event, data, this.handle.elem );
-				});
+		if( !bubbling ){
+			event = typeof event === "object" ?
+				// jQuery.Event object
+				event[expando] ? event :
+				// Object literal
+				jQuery.extend( jQuery.Event(type), event ) :
+				// Just the event type (string)
+				jQuery.Event(type);
+
+			if ( type.indexOf("!") >= 0 ) {
+				event.type = type = type.slice(0, -1);
+				event.exclusive = true;
+			}
 
-		// Handle triggering a single element
-		} else {
+			// Handle a global trigger
+			if ( !elem ) {
+				// Don't bubble custom events when global (to avoid too much overhead)
+				event.stopPropagation();
+				// Only trigger if we've ever bound an event for it
+				if ( this.global[type] )
+					jQuery.each( jQuery.cache, function(){
+						if ( this.events && this.events[type] )
+							jQuery.event.trigger( event, data, this.handle.elem );
+					});
+			}
+
+			// Handle triggering a single element
 
 			// don't do events on text and comment nodes
-			if ( elem.nodeType == 3 || elem.nodeType == 8 )
+			if ( !elem || elem.nodeType == 3 || elem.nodeType == 8 )
 				return undefined;
-
-			// Clone the incoming data, if any
-			data = jQuery.makeArray(data);
-
+			
 			// AT_TARGET phase (not bubbling)
-			if( !event.target ){
+			if( !bubbling ){
 				// Clean up in case it is reused
 				event.result = undefined;
 				event.target = elem;
+				
+				// Clone the incoming data, if any
+				data = jQuery.makeArray(data);
+				data.unshift( event );
 			}
+		}
 
-			// Fix for custom events
-			event.currentTarget = elem;
-
-			data.unshift( event );
-
-			var fn = jQuery.isFunction( elem[ type ] );
-
-			// Trigger the event, it is assumed that "handle" is a function
-			var handle = jQuery.data(elem, "handle");
-			if ( handle )
-				handle.apply( elem, data );
+		event.currentTarget = elem;
 
-			// Handle triggering native .onfoo handlers (and on links since we don't call .click() for links)
-			if ( (!fn || (jQuery.nodeName(elem, 'a') && type == "click")) && elem["on"+type] && elem["on"+type].apply( elem, data ) === false )
-				event.result = false;
+		var fn = jQuery.isFunction( elem[ type ] );
 
-			// Extra functions don't get the custom event object
-			data.shift();
+		// Trigger the event, it is assumed that "handle" is a function
+		var handle = jQuery.data(elem, "handle");
+		if ( handle )
+			handle.apply( elem, data );
 
-			// Trigger the native events (except for clicks on links)
-			if ( event.target === elem && fn && !event.isDefaultPrevented() && !(jQuery.nodeName(elem, 'a') && type == "click") ) {
-				this.triggered = true;
-				try {
-					elem[ type ]();
-				// prevent IE from throwing an error for some hidden elements
-				} catch (e) {}
-			}
+		// Handle triggering native .onfoo handlers (and on links since we don't call .click() for links)
+		if ( (!fn || (jQuery.nodeName(elem, 'a') && type == "click")) && elem["on"+type] && elem["on"+type].apply( elem, data ) === false )
+			event.result = false;
 
-			if ( !event.isPropagationStopped() ) {
-				var parent = elem.parentNode || elem.ownerDocument;
-				if ( parent )
-					jQuery.event.trigger(event, data, parent);
-			}
+		// data.shift();
 
-			// Clean up, in case the event object is reused
-			event.target = null;
+		// Trigger the native events (except for clicks on links)
+		if ( !bubbling && fn && !event.isDefaultPrevented() && !(jQuery.nodeName(elem, 'a') && type == "click") ) {
+			this.triggered = true;
+			try {
+				elem[ type ]();
+			// prevent IE from throwing an error for some hidden elements
+			} catch (e) {}
+		}
 
-			this.triggered = false;
+		if ( !event.isPropagationStopped() ) {
+			var parent = elem.parentNode || elem.ownerDocument;
+			if ( parent )
+				jQuery.event.trigger(event, data, parent, true);
 		}
+
+		this.triggered = false;
 	},
 
 	handle: function(event) {