Fix #10563. Ensure event.currentTarget==this if delegated.

Now, event.delegateTarget is always the element where the event was handled, regardless of whether delegated handlers are attached.

src/event.js

@@ -412,7 +412,7 @@ jQuery.event = {

		// Use the fix-ed jQuery.Event rather than the (read-only) native event
		args[0] = event;
		event.currentTarget = this;
		event.delegateTarget = this;

		// Determine handlers that should run if there are delegated events
		// Avoid disabled elements in IE (#6911) and non-left-click bubbling in Firefox (#3861)
@@ -447,18 +447,18 @@ jQuery.event = {
			handlerQueue.push({ elem: this, matches: handlers.slice( delegateCount ) });
		}

		// Run delegates first; they may want to stop propagation beneath us
		for ( i = 0; i < handlerQueue.length && !event.isPropagationStopped(); i++ ) {
			matched = handlerQueue[ i ];
			event.currentTarget = matched.elem;

			for ( j = 0; j < matched.matches.length && !event.isImmediatePropagationStopped(); j++ ) {
				handleObj = matched.matches[ j ];

				// Triggered event must either 1) be non-exclusive and have no namespace, or
				// 2) have namespace(s) a subset or equal to those in the bound event (both can have no namespace).
				if ( run_all || (!event.namespace && !handleObj.namespace) || event.namespace_re && event.namespace_re.test( handleObj.namespace ) ) {

					// Pass in a reference to the handler function itself
					// So that we can later remove it
					event.handler = handleObj.handler;
					event.data = handleObj.data;
					event.handleObj = handleObj;

@@ -929,7 +929,7 @@ jQuery.fn.extend({
		if ( types && types.preventDefault && types.handleObj ) {
			// ( event )  dispatched jQuery.Event
			var handleObj = types.handleObj;
			jQuery( types.currentTarget ).off( 
			jQuery( types.delegateTarget ).off( 
				handleObj.namespace? handleObj.type + "." + handleObj.namespace : handleObj.type, 
				handleObj.selector, 
				handleObj.handler

test/unit/event.js

@@ -1060,7 +1060,7 @@ test("trigger(eventObject, [data], [fn])", function() {
		// Tries bubbling
		equals( e.type, "foo", "Verify event type when passed passing an event object" );
		equals( e.target.id, "child", "Verify event.target when passed passing an event object" );
		equals( e.currentTarget.id, "par", "Verify event.target when passed passing an event object" );
		equals( e.currentTarget.id, "par", "Verify event.currentTarget when passed passing an event object" );
		equals( e.secret, "boo!", "Verify event object's custom attribute when passed passing an event object" );
	});

@@ -1160,18 +1160,20 @@ test("jQuery.Event( type, props )", function() {
});

test("jQuery.Event.currentTarget", function(){
	expect(1);

	var counter = 0,
		$elem = jQuery("<button>a</button>").click(function(e){
		equals( e.currentTarget, this, "Check currentTarget on "+(counter++?"native":"fake") +" event" );
	});

	// Fake event
	$elem.trigger("click");

	// Cleanup
	$elem.unbind();
	expect(2);

	jQuery('<div><p><button>shiny</button></p></div>')
		.on( "click", "p", function( e ){
				equals( e.currentTarget, this, "Check delegated currentTarget on event" );
		})
		.find( "button" )
			.on( "click", function( e ){
				equals( e.currentTarget, this, "Check currentTarget on event" );
			})
			.click()
			.off( "click" )
		.end()
		.off( "click" );
});

test("toggle(Function, Function, ...)", function() {
@@ -1253,7 +1255,7 @@ test("toggle(Function, Function, ...)", function() {
});

test(".live()/.die()", function() {
	expect(65);
	expect(66);

	var submit = 0, div = 0, livea = 0, liveb = 0;

@@ -1476,7 +1478,8 @@ test(".live()/.die()", function() {
	// Test this, target and currentTarget are correct
	jQuery("span#liveSpan1").live("click", function(e){
		equals( this.id, "liveSpan1", "Check the this within a live handler" );
		equals( e.currentTarget, document, "Check the event.currentTarget within a live handler" );
		equals( e.currentTarget.id, "liveSpan1", "Check the event.currentTarget within a live handler" );
		equals( e.delegateTarget, document, "Check the event.delegateTarget within a live handler" );
		equals( e.target.nodeName.toUpperCase(), "A", "Check the event.target within a live handler" );
	});

@@ -1784,7 +1787,7 @@ test("live with special events", function() {
});

test(".delegate()/.undelegate()", function() {
	expect(64);
	expect(65);

	var submit = 0, div = 0, livea = 0, liveb = 0;

@@ -2008,7 +2011,8 @@ test(".delegate()/.undelegate()", function() {
	// Test this, target and currentTarget are correct
	jQuery("#body").delegate("span#liveSpan1", "click", function(e){
		equals( this.id, "liveSpan1", "Check the this within a delegate handler" );
		equals( e.currentTarget, document.body, "Check the event.currentTarget within a delegate handler" );
		equals( e.currentTarget.id, "liveSpan1", "Check the event.currentTarget within a delegate handler" );
		equals( e.delegateTarget, document.body, "Check the event.delegateTarget within a delegate handler" );
		equals( e.target.nodeName.toUpperCase(), "A", "Check the event.target within a delegate handler" );
	});