Theme Customizer: Reset scroll to top when the preview url is changed. props ocean90, fixes #20713, see #19910.

git-svn-id: http://core.svn.wordpress.org/trunk@20833 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/customize-preview.dev.js

@@ -34,6 +34,7 @@
 			this.body = $( document.body );
 			this.body.on( 'click.preview', 'a', function( event ) {
 				event.preventDefault();
+				self.send( 'scroll', 0 );
 				self.send( 'url', $(this).prop('href') );
 			});