Followup to #8753. Modify new Event constructor signature to...

Followup to #8753. Modify new Event constructor signature to jQuery.event(type, props), which can be exploited by jQuery.event.trigger as well.

src/event.js

@@ -304,9 +304,9 @@ jQuery.event = {
 			// jQuery.Event object
 			event[ jQuery.expando ] ? event :
 			// Object literal
-			jQuery.extend( new jQuery.Event(type), event ) :
+			new jQuery.Event( type, event ) :
 			// Just the event type (string)
-			new jQuery.Event(type);
+			new jQuery.Event( type );
 
 		event.type = type;
 		event.namespace = namespaces.join(".");
@@ -563,26 +563,15 @@ jQuery.removeEvent = document.removeEventListener ?
 		}
 	};
 
-jQuery.Event = function( src ) {
+jQuery.Event = function( src, props ) {
 	// Allow instantiation without the 'new' keyword
 	if ( !this.preventDefault ) {
-		return new jQuery.Event( src );
+		return new jQuery.Event( src, props );
 	}
 
 	// Event object
 	if ( src && src.type ) {
 		this.originalEvent = src;
-
-		// Push explicitly provided properties onto the event object
-		for ( var prop in src ) {
-			//	Ensure we don't clobber jQuery.Event prototype
-			//	with own properties.
-			if ( hasOwn.call( src, prop ) ) {
-				this[ prop ] = src[ prop ];
-			}
-		}
-
-		// Always ensure a type has been explicitly set
 		this.type = src.type;
 
 		// Events bubbling up the document may have been marked as prevented
@@ -595,6 +584,11 @@ jQuery.Event = function( src ) {
 		this.type = src;
 	}
 
+	// Put explicitly provided properties onto the event object
+	if ( props ) {
+		jQuery.extend( this, props );
+	}
+
 	// timeStamp is buggy for some events on Firefox(#3843)
 	// So we won't rely on the native value
 	this.timeStamp = jQuery.now();

test/unit/event.js

@@ -978,11 +978,11 @@ test("trigger(eventObject, [data], [fn])", function() {
 	$parent.unbind().remove();
 });
 
-test("jQuery.Event({ /* props */ })", function() {
+test("jQuery.Event( type, props )", function() {
 
 	expect(4);
 
-	var event = jQuery.Event({ type: "keydown", keyCode: 64 }),
+	var event = jQuery.Event( "keydown", { keyCode: 64 }),
 			handler = function( event ) {
 				ok( "keyCode" in event, "Special property 'keyCode' exists" );
 				equal( event.keyCode, 64, "event.keyCode has explicit value '64'" );