Ticket #18198: 18198.has-right-sidebar.patch

wp-admin/css/wp-admin.dev.css

@@ -2681 +2681 @@
   11.0 - Write/Edit Post Screen
 ------------------------------------------------------------------------------*/
 
-.postarea {
+.postarea,
+.meta-box-sortables {
         max-width: 900px;
 }
 

wp-admin/js/postbox.dev.js

@@ -192 +192 @@
                                 }
 
                                 if ( pb > 1149 ) {
+                                        $('#poststuff').addClass('has-right-sidebar');
                                         $(document.body).addClass('wide-screen');
                                 }