added inline disposition for PDF previews (#3486)

src/Export/Base/DispositionInlineInterface.php

@@ -0,0 +1,18 @@
+<?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\Export\Base;
+
+/**
+ * @deprecated remove me in 2.0
+ */
+interface DispositionInlineInterface
+{
+    public function setDispositionInline(bool $useInlineDisposition): void;
+}