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Gray out trivial database names

libraries/List_Database.class.php

@@ -27,6 +27,16 @@ require_once './libraries/List.class.php';
  */
 /*public*/ class PMA_List_Database extends PMA_List
 {
+    /**
+     * @var array   list of trivial database names
+     */
+    protected $_trivial_db_names = array(
+        'information_schema',
+        'mysql',
+        'performance_schema',
+        'sys',
+    );
+
     /**
      * @var mixed   database link resource|object to be used
      */
@@ -387,6 +397,9 @@ require_once './libraries/List.class.php';
                 if (! empty($db['comment'])) {
                     $return .= ' title="' . htmlspecialchars($db['comment']) . '"';
                 }
+                if (in_array($db['name'], $this->_trivial_db_names)) {
+                    $return .= ' class="trivial"';
+                }
                 $return .= ' href="index.php?' . PMA_generate_common_url($db['name'])
                     . '" target="_parent">';
                 if ($cut) {