Admin Panel: save menu collapse state

admin/tools/menu_collapse.php

@@ -0,0 +1,23 @@
+<?php
+
+const MYAAC_ADMIN = true;
+const IGNORE_SET_LAST_VISIT = true;
+
+require '../../common.php';
+require SYSTEM . 'functions.php';
+require SYSTEM . 'init.php';
+require SYSTEM . 'login.php';
+
+if(!admin()) {
+	http_response_code(500);
+	die('You are not logged in. Probably session expired. Please login again.');
+}
+
+if (!isset($_POST['collapse'])) {
+	http_response_code(500);
+	die('Something went wrong.');
+}
+
+csrfProtect();
+
+setSession('admin.menu-collapse', $_POST['collapse'] == 'true');