Use DOMDocument LIBXML_PARSEHUGE and LIBXML_COMPACT options if possible (#1489302)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Use DOMDocument LIBXML_PARSEHUGE and LIBXML_COMPACT options if possible (#1489302)
 - Support HTTP_HOST, SERVER_NAME and SERVER_ADDR values in include_host_config feature
 - Hide Delivery Status Notification option when smtp_server is unset (#1489336)
 - Make default font size for HTML messages configurable (request #118)

program/lib/Roundcube/rcube_washtml.php

@@ -377,7 +377,14 @@ class rcube_washtml
         // Detect max nesting level (for dumpHTML) (#1489110)
         $this->max_nesting_level = (int) @ini_get('xdebug.max_nesting_level');
 
-        @$node->loadHTML($html);
+        // Use optimizations if supported
+        if (version_compare(PHP_VERSION, '5.4.0', '>=')) {
+            @$node->loadHTML($html, LIBXML_PARSEHUGE | LIBXML_COMPACT);
+        }
+        else {
+            @$node->loadHTML($html);
+        }
+
         return $this->dumpHtml($node);
     }