support custom fields for invoices (#3077)

src/Event/InvoiceMetaDisplayEvent.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Event;
+
+use App\Repository\Query\InvoiceArchiveQuery;
+
+/**
+ * Dynamically find possible meta fields for an invoice-archive query.
+ *
+ * @method InvoiceArchiveQuery getQuery()
+ */
+final class InvoiceMetaDisplayEvent extends AbstractMetaDisplayEvent
+{
+    public const INVOICE = 'invoice';
+
+    public function __construct(InvoiceArchiveQuery $query, string $location)
+    {
+        parent::__construct($query, $location);
+    }
+}