Twenty Twelve: stop nav slide animation when clicking the button mult…

…iple times in a row. Props Jayjdk, fixes #21531.

git-svn-id: http://core.svn.wordpress.org/trunk@21519 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentytwelve/js/theme.js

@@ -14,7 +14,7 @@ jQuery( document ).ready( function( $ ) {
 		masthead.find( '.site-navigation h3' ).removeClass( 'assistive-text' ).addClass( 'menu-toggle' );
 
 		$( '.menu-toggle' ).off( 'click' ).click( function() {
-			masthead.find( '.menu' ).slideToggle();
+			masthead.find( '.menu' ).stop().slideToggle();
 			$( this ).toggleClass( 'toggled-on' );
 		} );
 	};