Do not refresh the whole page when changing subtask status (work in progress)

app/Controller/SubtaskStatus.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Kanboard\Controller;
+
+/**
+ * Subtask Status
+ *
+ * @package  controller
+ * @author   Frederic Guillot
+ */
+class SubtaskStatus extends Base
+{
+    /**
+     * Change status to the next status: Toto -> In Progress -> Done
+     *
+     * @access public
+     */
+    public function change()
+    {
+        $task = $this->getTask();
+        $subtask = $this->getSubtask();
+
+        $status = $this->subtask->toggleStatus($subtask['id']);
+        $subtask['status'] = $status;
+
+        $this->response->html($this->helper->subtask->toggleStatus($subtask, $task['project_id']));
+    }
+}