Update inbuilt renderers for node/leaf state in listitem_open

- includes, xhtml renderer adding 'node' class to <li> when it contains
  child list(s)

inc/parser/metadata.php

@@ -251,8 +251,9 @@ class Doku_Renderer_metadata extends Doku_Renderer {
      * Open a list item
      *
      * @param int $level the nesting level
+     * @param bool $node true when a node; false when a leaf
      */
-    function listitem_open($level) {
+    function listitem_open($level,$node=false) {
         $this->cdata(str_repeat(DOKU_TAB, $level).'* ');
     }
 

inc/parser/renderer.php

@@ -343,8 +343,9 @@ class Doku_Renderer extends DokuWiki_Plugin {
      * Open a list item
      *
      * @param int $level the nesting level
+     * @param bool $node true when a node; false when a leaf
      */
-    function listitem_open($level) {
+    function listitem_open($level,$node=false) {
     }
 
     /**

inc/parser/xhtml.php

@@ -456,9 +456,11 @@ class Doku_Renderer_xhtml extends Doku_Renderer {
      * Open a list item
      *
      * @param int $level the nesting level
+     * @param bool $node true when a node; false when a leaf
      */
-    function listitem_open($level) {
-        $this->doc .= '<li class="level'.$level.'">';
+    function listitem_open($level, $node=false) {
+        $branching = $node ? ' node' : '';
+        $this->doc .= '<li class="level'.$level.$branching.'">';
     }
 
     /**