Set the property corresponding to a boolean attribute when setting to…

… true. Fixes #9103.

- Once boolean properties had been modified natively, setting the attribute no longer set the current value

src/attributes.js

@@ -301,7 +301,7 @@ jQuery.extend({
			return jQuery( elem )[ name ]( value );
		}

		var ret, hooks,
		var ret, hooks, boolProp,
			notxml = nType !== 1 || !jQuery.isXMLDoc( elem );

		// Normalize the name if needed
@@ -326,7 +326,12 @@ jQuery.extend({
			} else {

				// Set boolean attributes to the same name
				// Also set the DOM property
				if ( value === true && !rspecial.test( name ) ) {
					boolProp = jQuery.propFix[ name ] || name;
					if ( !rinvalidChar.test( boolProp ) && typeof elem[ boolProp ] === "boolean" ) {
						elem[ boolProp ] = true;
					}
					value = name.toLowerCase();
				}

@@ -338,7 +343,6 @@ jQuery.extend({
			return hooks.get( elem, name );

		} else {
			var boolProp;

			// Align boolean attributes with corresponding properties
			// Do not check the property if the name contains characters

test/unit/attributes.js

@@ -163,7 +163,8 @@ test("attr(String, Object)", function() {
	equals( jQuery("#name").attr("name"), "something", "Set name attribute" );
	jQuery("#name").attr("name", null);
	equals( jQuery("#name").attr("name"), undefined, "Remove name attribute" );
	jQuery("#check2").attr("checked", true);

	jQuery("#check2").prop("checked", true).prop("checked", false).attr("checked", true);
	equals( document.getElementById("check2").checked, true, "Set checked attribute" );
	equals( jQuery("#check2").prop("checked"), true, "Set checked attribute" );
	equals( jQuery("#check2").attr("checked"), "checked", "Set checked attribute" );