prevent deletion of WP Users segment in Segments listing

lib/Models/Segment.php

@@ -190,4 +190,24 @@ class Segment extends Model {
   static function getPublic() {
     return self::getPublished()->where('type', 'default')->orderByAsc('name');
   }
+
+  static function bulkTrash($orm) {
+    return parent::bulkAction($orm, function($ids) {
+      parent::rawExecute(join(' ', array(
+        'UPDATE `'.self::$_table.'`',
+        'SET `deleted_at`=NOW()',
+        'WHERE `id` IN ('.rtrim(str_repeat('?,', count($ids)), ',').')',
+        'AND `type` = "default"'
+      )), $ids);
+    });
+  }
+
+  static function bulkDelete($orm) {
+    return parent::bulkAction($orm, function($ids) {
+      // delete segments (only default)
+      Segment::whereIn('id', $ids)
+        ->where('type', 'default')
+        ->deleteMany();
+    });
+  }
 }