--- ../drupal/modules/system.module	2005-03-09 04:00:02.000000000 +0100
+++ modules/system.module	2005-03-13 21:17:34.000000000 +0100
@@ -467,6 +467,7 @@ function system_module_listing() {
 
   $required = array('block', 'filter', 'system', 'user', 'watchdog');
   $throttle_required = array_merge($required, array('throttle'));
+  $depends = module_invoke_all('info');
 
   $header = array(t('Name'), t('Description'), t('Enabled'));
   if (module_exist('throttle')) {
@@ -488,15 +489,29 @@ function system_module_listing() {
       }
     }
 
+    if (!$file->status && in_array($file->name, $depends)) {
+      drupal_set_message(t('%module is enabled because other modules depend on it.', array ('%module' =>'<em>'. $file->name .'</em>')), 'error');
+      $file->status = 1;
+      $need_save = TRUE;
+    }
+
     // Update the contents of the system table:
     db_query("DELETE FROM {system} WHERE name = '%s' AND type = '%s'", $file->name, 'module');
     db_query("INSERT INTO {system} (name, description, type, filename, status, throttle, bootstrap) VALUES ('%s', '%s', '%s', '%s', %d, %d, %d)", $file->name, $file->description, 'module', $file->filename, $file->status, $file->throttle, $bootstrap);
 
     $row = array($file->name, $file->description, array('data' => (in_array($file->name, $required) ? form_hidden("status][$file->name", 1) . t('required') : form_checkbox('', "status][$file->name", 1, $file->status)), 'align' => 'center'));
+    $edit['status'][$file->name] = $file->status;
     if (module_exist('throttle')) {
       $row[] = array('data' => (in_array($file->name, $throttle_required) ? form_hidden("throttle][$file->name", 0) . t('required') : form_checkbox(NULL, "throttle][$file->name", 1, $file->throttle, NULL)), 'align' => 'center');
+      $edit['throttle'][$file->name] = $file->throttle;
     }
     $rows[] = $row;
+
+  }
+
+  if ($need_save) {
+    $edit['type'] = 'module';
+    system_listing_save($edit, t('Save configuration'));
   }
 
   $output  = theme('table', $header, $rows);
@@ -505,9 +520,13 @@ function system_module_listing() {
   return $output;
 }
 
-function system_listing_save($edit = array()) {
-  $op = $_POST['op'];
-  $edit = $_POST['edit'];
+function system_listing_save($edit = array(), $op = '') {
+  if (empty($op)) {
+    $op = $_POST['op'];
+  }
+  if (empty($edit)) {
+    $edit = $_POST['edit'];
+  }
 
   if ($op == t('Save configuration')) {
     db_query("UPDATE {system} SET status = 0 WHERE type = '%s'", $edit['type']);
--- ../drupal/modules/forum.module	2005-03-09 16:00:01.000000000 +0100
+++ modules/forum.module	2005-03-13 21:16:53.000000000 +0100
@@ -25,6 +25,14 @@ function forum_help($section) {
 }
 
 /**
+ * Implementation of hook_info().
+ */
+function forum_info($key = 'depends') {
+  $info['depends'] = 'comment';
+  return $info[$key];
+}
+
+/**
  * Implementation of hook_node_name().
  */
 function forum_node_name($node) {
--- includes/bootstrap.inc	2005-01-09 16:00:01.000000000 +0100
+++ ../drupal/includes/bootstrap.inc	2005-03-13 21:12:32.000000000 +0100
@@ -610,7 +610,9 @@ function drupal_set_message($message = N
       $_SESSION['messages'][$type] = array();
     }
 
-    $_SESSION['messages'][$type][] = $message;
+    if (!in_array($message, $_SESSION['messages'][$type])) {
+      $_SESSION['messages'][$type][] = $message;
+    }
   }
 
   return $_SESSION['messages'];