Ticket #20961: 20961.patch

wp-admin/includes/update.php

@@ -264 +264 @@
         $themes_allowedtags = array('a' => array('href' => array(),'title' => array()),'abbr' => array('title' => array()),'acronym' => array('title' => array()),'code' => array(),'em' => array(),'strong' => array());
         $theme_name = wp_kses( $theme['Name'], $themes_allowedtags );
 
-        $details_url = self_admin_url("theme-install.php?tab=theme-information&theme=$theme_key&TB_iframe=true&width=600&height=400");
+        $details_url = add_query_arg( array( 'TB_iframe' => 'true', 'width' => 1024, 'height' => 800 ), $current->response[ $theme_key ]['url'] );
 
         $wp_list_table = _get_list_table('WP_MS_Themes_List_Table');