Fix #12127, fer real. IE9/10 check state on clone. Close gh-875.

AUTHORS.txt

@@ -129,3 +129,4 @@ David Benjamin <davidben@mit.edu>
 Uri Gilad <antishok@gmail.com>
 Chris Faulkner <thefaulkner@gmail.com>
 Elijah Manor <elijah.manor@gmail.com>
+Daniel Chatfield <chatfielddaniel@googlemail.com>

src/manipulation.js

@@ -455,9 +455,8 @@ function cloneFixAttributes( src, dest ) {
 		// IE6-8 fails to persist the checked state of a cloned checkbox
 		// or radio button. Worse, IE6-7 fail to give the cloned element
 		// a checked appearance if the defaultChecked value isn't also set
-		if ( src.checked ) {
-			dest.defaultChecked = dest.checked = src.checked;
-		}
+
+		dest.defaultChecked = dest.checked = src.checked;
 
 		// IE6-7 get confused and end up setting the value of a cloned
 		// checkbox/radio button to an empty string instead of "on"

test/unit/manipulation.js

@@ -1895,3 +1895,15 @@ test("html() - script exceptions bubble (#11743)", function() {
 		ok( false, "error ignored" );
 	}, "exception bubbled from remote script" );
 });
+
+test("checked state is cloned with clone()", function(){
+	expect(2);
+
+	var elem = jQuery.parseHTML("<input type='checkbox' checked='checked'/>")[0];
+	elem.checked = false;
+	equal( jQuery(elem).clone().attr("id","clone")[0].checked, false, "Checked false state correctly cloned" );
+	
+	elem = jQuery.parseHTML("<input type='checkbox'/>")[0];
+	elem.checked = true;
+	equal( jQuery(elem).clone().attr("id","clone")[0].checked, true, "Checked true state correctly cloned" );
+});