Event: Call underlying stopImmediatePropagation when present

Fixes #13997
(cherry picked from commit 6a89db86)

src/event.js

@@ -751,7 +751,14 @@ jQuery.Event.prototype = {
 		e.cancelBubble = true;
 	},
 	stopImmediatePropagation: function() {
+		var e = this.originalEvent;
+
 		this.isImmediatePropagationStopped = returnTrue;
+
+		if ( e && e.stopImmediatePropagation ) {
+			e.stopImmediatePropagation();
+		}
+
 		this.stopPropagation();
 	}
 };

test/unit/event.js

@@ -386,10 +386,13 @@ test("on immediate propagation", function() {
 	$p.off( "click", "**" );
 });
 
-test("on bubbling, isDefaultPrevented", function() {
-	expect(2);
+test("on bubbling, isDefaultPrevented, stopImmediatePropagation", function() {
+	expect( 3 );
 	var $anchor2 = jQuery( "#anchor2" ),
 		$main = jQuery( "#qunit-fixture" ),
+		neverCallMe = function() {
+			ok( false, "immediate propagation should have been stopped" );
+		},
 		fakeClick = function($jq) {
 			// Use a native click so we don't get jQuery simulated bubbling
 			if ( document.createEvent ) {
@@ -427,6 +430,18 @@ test("on bubbling, isDefaultPrevented", function() {
 	fakeClick( $anchor2 );
 	$anchor2.off( "click" );
 	$main.off( "click", "**" );
+
+	if ( !window.addEventListener ) {
+		ok( true, "Old IE, skipping native stopImmediatePropagation check" );
+	} else {
+		$anchor2.on( "click", function( e ) {
+			e.stopImmediatePropagation();
+			ok( true, "anchor was clicked and prop stopped" );
+		});
+		$anchor2[0].addEventListener( "click", neverCallMe, false );
+		fakeClick( $anchor2 );
+		$anchor2[0].removeEventListener( "click", neverCallMe );
+	}
 });
 
 test("on(), iframes", function() {