Index: includes/menu.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/menu.inc,v
retrieving revision 1.357
diff -u -p -r1.357 menu.inc
--- includes/menu.inc	17 Oct 2009 11:39:15 -0000	1.357
+++ includes/menu.inc	29 Oct 2009 22:13:14 -0000
@@ -118,6 +118,11 @@ define('MENU_IS_LOCAL_TASK', 0x0080);
 define('MENU_IS_LOCAL_ACTION', 0x0100);
 
 /**
+ * Internal menu flag -- menu item is visible depending child items.
+ */
+define('MENU_DEPENDS_ON_CHILDREN', 0x0200);
+
+/**
  * @} End of "Menu flags".
  */
 
@@ -156,6 +161,15 @@ define('MENU_CALLBACK', MENU_VISIBLE_IN_
 define('MENU_SUGGESTED_ITEM', MENU_VISIBLE_IN_BREADCRUMB | 0x0010);
 
 /**
+ * Menu type -- A grouping menu item, hidden when no children are accessible.
+ *
+ * Modules may use "dynamic" menu items that are only displayed in case the
+ * current user is able to access any child item below it. They act like normal
+ * items when visible.
+ */
+define('MENU_DYNAMIC_ITEM', MENU_VISIBLE_IN_TREE | MENU_VISIBLE_IN_BREADCRUMB | MENU_DEPENDS_ON_CHILDREN);
+
+/**
  * Menu type -- A task specific to the parent item, usually rendered as a tab.
  *
  * Local tasks are menu items that describe actions to be performed on their
@@ -1267,7 +1281,6 @@ function menu_tree_check_access(&$tree, 
     }
   }
   _menu_tree_check_access($tree);
-  return;
 }
 
 /**
@@ -1275,12 +1288,24 @@ function menu_tree_check_access(&$tree, 
  */
 function _menu_tree_check_access(&$tree) {
   $new_tree = array();
+  $tree_level_access = FALSE;
   foreach ($tree as $key => $v) {
     $item = &$tree[$key]['link'];
     _menu_link_translate($item);
     if ($item['access']) {
+      // Return that this level is accessible when at least one link on this
+      // tree level is accessible.
+      $tree_level_access = TRUE;
+
+      $child_access = FALSE;
       if ($tree[$key]['below']) {
-        _menu_tree_check_access($tree[$key]['below']);
+        $child_access = _menu_tree_check_access($tree[$key]['below']);
+      }
+      // If this link is a MENU_DYNAMIC_ITEM and there are no accessible
+      // children, then we mark it as inaccessible and skip it.
+      if ($item['type'] & MENU_DEPENDS_ON_CHILDREN && !$child_access) {
+        $item['access'] = FALSE;
+        continue;
       }
       // The weights are made a uniform 5 digits by adding 50000 as an offset.
       // After _menu_link_translate(), $item['title'] has the localized link title.
@@ -1291,6 +1316,8 @@ function _menu_tree_check_access(&$tree)
   // Sort siblings in the tree based on the weights and localized titles.
   ksort($new_tree);
   $tree = $new_tree;
+
+  return $tree_level_access;
 }
 
 /**
Index: modules/system/system.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.module,v
retrieving revision 1.828
diff -u -p -r1.828 system.module
--- modules/system/system.module	29 Oct 2009 06:58:56 -0000	1.828
+++ modules/system/system.module	29 Oct 2009 22:16:38 -0000
@@ -560,6 +560,7 @@ function system_menu() {
     'type' => MENU_CALLBACK,
     'file' => 'system.admin.inc',
   );
+
   $items['admin'] = array(
     'title' => 'Administer',
     'access arguments' => array('access administration pages'),
@@ -593,16 +594,18 @@ function system_menu() {
     'file' => 'system.admin.inc',
   );
 
-  // Menu items that are basically just menu blocks.
+  // Structure.
   $items['admin/structure'] = array(
     'title' => 'Structure',
     'description' => 'Control how your site looks and feels.',
+    'type' => MENU_DYNAMIC_ITEM,
     'position' => 'right',
     'weight' => -8,
     'page callback' => 'system_admin_menu_block_page',
     'access arguments' => array('access administration pages'),
     'file' => 'system.admin.inc',
   );
+
   // Appearance.
   $items['admin/appearance'] = array(
     'title' => 'Appearance',
@@ -647,9 +650,10 @@ function system_menu() {
     );
   }
 
-  // Configuration and modules.
+  // Configuration.
   $items['admin/config'] = array(
     'title' => 'Configuration and modules',
+    'type' => MENU_DYNAMIC_ITEM,
     'page callback' => 'system_admin_config_page',
     'access arguments' => array('access administration pages'),
     'file' => 'system.admin.inc',
@@ -661,6 +665,8 @@ function system_menu() {
     'weight' => -10,
     'file' => 'system.admin.inc',
   );
+
+  // Modules.
   $items['admin/config/modules'] = array(
     'title' => 'Modules',
     'description' => 'Enable or disable add-on modules for your site.',
@@ -694,7 +700,26 @@ function system_menu() {
     'file' => 'system.admin.inc',
   );
 
-  // Actions.
+  // System.
+  $items['admin/config/system'] = array(
+    'title' => 'System',
+    'description' => 'General system related configuration.',
+    'type' => MENU_DYNAMIC_ITEM,
+    'position' => 'right',
+    'weight' => -5,
+    'page callback' => 'system_admin_menu_block_page',
+    'access arguments' => array('access administration pages'),
+    'file' => 'system.admin.inc',
+  );
+  $items['admin/config/system/site-information'] = array(
+    'title' => 'Site information',
+    'description' => 'Change basic site name, e-mail address, slogan, default front page, number of posts per page, error pages and cron.',
+    'page callback' => 'drupal_get_form',
+    'page arguments' => array('system_site_information_settings'),
+    'access arguments' => array('administer site configuration'),
+    'file' => 'system.admin.inc',
+    'weight' => -10,
+  );
   $items['admin/config/system/actions'] = array(
     'title' => 'Actions',
     'description' => 'Manage the actions defined for your site.',
@@ -735,7 +760,7 @@ function system_menu() {
     'file' => 'system.admin.inc',
   );
 
-  // IP address blocking.
+  // People: IP address blocking.
   $items['admin/config/people/ip-blocking'] = array(
     'title' => 'IP address blocking',
     'description' => 'Manage blocked IP addresses.',
@@ -760,10 +785,11 @@ function system_menu() {
     'file' => 'system.admin.inc',
   );
 
-  // Configuration.
+  // Development.
   $items['admin/config/development'] = array(
     'title' => 'Development',
     'description' => 'Development tools.',
+    'type' => MENU_DYNAMIC_ITEM,
     'position' => 'left',
     'weight' => 10,
     'page callback' => 'system_admin_menu_block_page',
@@ -786,9 +812,20 @@ function system_menu() {
     'access arguments' => array('administer site configuration'),
     'file' => 'system.admin.inc',
   );
+  $items['admin/config/development/logging'] = array(
+    'title' => 'Logging and errors',
+    'description' => "Settings for logging and alerts modules. Various modules can route Drupal's system events to different destinations, such as syslog, database, email, etc.",
+    'page callback' => 'drupal_get_form',
+    'page arguments' => array('system_logging_settings'),
+    'access arguments' => array('administer site configuration'),
+    'file' => 'system.admin.inc',
+  );
+
+  // Media.
   $items['admin/config/media'] = array(
     'title' => 'Media',
     'description' => 'Media tools.',
+    'type' => MENU_DYNAMIC_ITEM,
     'position' => 'left',
     'weight' => 10,
     'page callback' => 'system_admin_menu_block_page',
@@ -814,6 +851,7 @@ function system_menu() {
   $items['admin/config/services'] = array(
     'title' => 'Web services',
     'description' => 'Tools related to web services.',
+    'type' => MENU_DYNAMIC_ITEM,
     'page callback' => 'system_admin_menu_block_page',
     'access arguments' => array('access administration pages'),
     'file' => 'system.admin.inc',
@@ -826,19 +864,12 @@ function system_menu() {
     'access arguments' => array('administer site configuration'),
     'file' => 'system.admin.inc',
   );
-  $items['admin/config/development/logging'] = array(
-    'title' => 'Logging and errors',
-    'description' => "Settings for logging and alerts modules. Various modules can route Drupal's system events to different destinations, such as syslog, database, email, etc.",
-    'page callback' => 'drupal_get_form',
-    'page arguments' => array('system_logging_settings'),
-    'access arguments' => array('administer site configuration'),
-    'file' => 'system.admin.inc',
-  );
 
   // Regional and date settings.
   $items['admin/config/regional'] = array(
     'title' => 'Regional and language',
     'description' => 'Regional settings, localization and translation.',
+    'type' => MENU_DYNAMIC_ITEM,
     'position' => 'left',
     'weight' => -7,
     'page callback' => 'system_admin_menu_block_page',
@@ -937,9 +968,11 @@ function system_menu() {
     'file' => 'system.admin.inc',
   );
 
+  // Search and metadata.
   $items['admin/config/search'] = array(
     'title' => 'Search and metadata',
     'description' => 'Local site search, metadata and SEO.',
+    'type' => MENU_DYNAMIC_ITEM,
     'page callback' => 'system_admin_menu_block_page',
     'access arguments' => array('access administration pages'),
     'file' => 'system.admin.inc',
@@ -960,40 +993,26 @@ function system_menu() {
     'type' => MENU_CALLBACK,
     'file' => 'system.admin.inc',
   );
+
+  // Content authoring.
   $items['admin/config/content'] = array(
     'title' => 'Content authoring',
     'description' => 'Settings related to formatting and authoring content.',
+    'type' => MENU_DYNAMIC_ITEM,
     'position' => 'right',
     'weight' => 5,
     'page callback' => 'system_admin_menu_block_page',
     'access arguments' => array('access administration pages'),
     'file' => 'system.admin.inc',
   );
-  $items['admin/config/system'] = array(
-    'title' => 'System',
-    'description' => 'General system related configuration.',
-    'position' => 'right',
-    'weight' => -5,
-    'page callback' => 'system_admin_menu_block_page',
-    'access arguments' => array('access administration pages'),
-    'file' => 'system.admin.inc',
-  );
-  $items['admin/config/system/site-information'] = array(
-    'title' => 'Site information',
-    'description' => 'Change basic site name, e-mail address, slogan, default front page, number of posts per page, error pages and cron.',
-    'page callback' => 'drupal_get_form',
-    'page arguments' => array('system_site_information_settings'),
-    'access arguments' => array('administer site configuration'),
-    'file' => 'system.admin.inc',
-    'weight' => -10,
-  );
 
   // Reports.
   $items['admin/reports'] = array(
     'title' => 'Reports',
     'description' => 'View reports from system logs and other status information.',
+    'type' => MENU_DYNAMIC_ITEM,
     'page callback' => 'system_admin_menu_block_page',
-    'access arguments' => array('access site reports'),
+    'access arguments' => array('access administration pages'),
     'weight' => 5,
     'position' => 'left',
     'file' => 'system.admin.inc',
@@ -1020,6 +1039,7 @@ function system_menu() {
     'type' => MENU_CALLBACK,
     'file' => 'system.admin.inc',
   );
+
   // Default page for batch operations.
   $items['batch'] = array(
     'page callback' => 'system_batch_page',