Fix #11649. Preserve oldIE submit flag when cloning, closes gh-772.

src/event.js

@@ -772,11 +772,11 @@ if ( !jQuery.support.submitBubbles ) {
 				// Node name check avoids a VML-related crash in IE (#9807)
 				var elem = e.target,
 					form = jQuery.nodeName( elem, "input" ) || jQuery.nodeName( elem, "button" ) ? elem.form : undefined;
-				if ( form && !form._submit_attached ) {
+				if ( form && !jQuery._data( form, "_submit_attached" ) ) {
 					jQuery.event.add( form, "submit._submit", function( event ) {
 						event._submit_bubble = true;
 					});
-					form._submit_attached = true;
+					jQuery._data( form, "_submit_attached", true );
 				}
 			});
 			// return undefined since we don't need an event listener

src/manipulation.js

@@ -467,7 +467,6 @@ function cloneFixAttributes( src, dest ) {
 
 	// Clear flags for bubbling special change/submit events, they must
 	// be reattached when the newly cloned events are first activated
-	dest.removeAttribute( "_submit_attached" );
 	dest.removeAttribute( "_change_attached" );
 }
 

test/unit/event.js

@@ -1062,6 +1062,41 @@ test("trigger(type, [data], [fn])", function() {
 	form.remove();
 });
 
+test( "submit event bubbles on copied forms (#11649)", function(){
+	expect( 3 );
+
+	var $formByClone, $formByHTML,
+		$testForm = jQuery("#testForm"),
+		$fixture = jQuery("#qunit-fixture"),
+		$wrapperDiv = jQuery("<div/>").appendTo( $fixture );
+
+	function noSubmit( e ) {
+		e.preventDefault();
+	}
+	function delegatedSubmit() {
+		ok( true, "Make sure submit event bubbles up." );
+		return false;
+	}
+
+	// Attach a delegated submit handler to the parent element
+	$fixture.on( "submit", "form", delegatedSubmit );
+
+	// Trigger form submission to introduce the _submit_attached property
+	$testForm.on( "submit", noSubmit ).find("input[name=sub1]").click();
+
+	// Copy the form via .clone() and .html()
+	$formByClone = $testForm.clone( true, true ).removeAttr("id");
+	$formByHTML = jQuery( $fixture.html() ).filter("#testForm").removeAttr("id");
+	$wrapperDiv.append( $formByClone, $formByHTML );
+
+	// Check submit bubbling on the copied forms
+	$wrapperDiv.find("form").on( "submit", noSubmit ).find("input[name=sub1]").click();
+
+	// Clean up
+	$wrapperDiv.remove();
+	$fixture.off( "submit", "form", delegatedSubmit );
+});
+
 test("trigger(eventObject, [data], [fn])", function() {
 	expect(28);