Event: Remove fake originalEvent from jQuery.Event.simulate

Fixes gh-2300
Closes gh-2303

src/event.js

@@ -610,10 +610,14 @@ jQuery.event = {
 			event,
 			{
 				type: type,
-				isSimulated: true,
+				isSimulated: true
-				originalEvent: {}
 			}
 		);
+
+		// This prevents stopPropagation(), stopImmediatePropagation(), and preventDefault() from
+		// preventing default on the donor event.
+		delete e.originalEvent;
+
 		if ( bubble ) {
 			jQuery.event.trigger( e, null, elem );
 		} else {

test/index.html

@@ -42,6 +42,11 @@
 	<!-- this iframe is outside the #qunit-fixture so it won't reload constantly wasting time, but it means the tests must be "safe" and clean up after themselves -->
 	<iframe id="loadediframe" name="loadediframe" style="display:none;" src="data/iframe.html"></iframe>
 	<dl id="dl" style="position:absolute;top:-32767px;left:-32767px;width:1px;">
+	<div id="donor-outer">
+		<form id="donor-form">
+			<input id="donor-input" type="radio" />
+		</form>
+	</div>
 	<div id="qunit-fixture">
 		<p id="firstp">See <a id="simon1" href="http://simon.incutio.com/archive/2003/03/25/#getElementsBySelector" rel="bookmark">this blog entry</a> for more information.</p>
 		<p id="ap">

test/unit/event.js

@@ -2671,6 +2671,60 @@ test( ".off() removes the expando when there's no more data", function() {
 	}
 });
 
+test( "preventDefault() on focusin does not throw exception", function( assert ) {
+	expect( 1 );
+
+	var done = assert.async(),
+		input = jQuery( "<input/>" ).appendTo( "#form" );
+		input
+			.on( "focusin", function( event ) {
+				var exceptionCaught;
+
+				try {
+					event.preventDefault();
+				} catch ( theException ) {
+					exceptionCaught = theException;
+				}
+
+				assert.strictEqual( exceptionCaught, undefined,
+					"Preventing default on focusin throws no exception" );
+
+				done();
+			} )
+			.focus();
+} );
+
+test( "jQuery.event.simulate() event has no originalEvent", function( assert ) {
+	expect( 1 );
+
+	var done = assert.async(),
+		input = jQuery( "<input>" )
+		.on( "click", function( event ) {
+			assert.strictEqual( "originalEvent" in event, false,
+				"originalEvent not present on simulated event" );
+			done();
+		} );
+
+	jQuery.event.simulate( "click", input[ 0 ], new jQuery.Event(), true );
+} );
+
+test( "Donor event interference", function( assert ) {
+	assert.expect( 4 );
+
+	jQuery( "#donor-outer" ).on( "click", function() {
+		assert.ok( true, "click bubbled to outer div" );
+	} );
+	jQuery( "#donor-input" ).on( "click", function( event ) {
+		assert.ok( true, "got a click event from the input" );
+		assert.ok( !event.isPropagationStopped(), "propagation says it's not stopped" );
+	} );
+	jQuery( "#donor-input" ).on( "change", function( event ) {
+		assert.ok( true, "got a change event from the input" );
+		event.stopPropagation();
+	} );
+	jQuery( "#donor-input" )[0].click();
+} );
+
 // This tests are unreliable in Firefox
 if ( !(/firefox/i.test( window.navigator.userAgent )) ) {
 	test( "Check order of focusin/focusout events", 2, function() {