More refactor

Signed-off-by: Varun Patil <varunpatil@ucla.edu>

lib/Db/TimelineQuery.php

@@ -36,7 +36,7 @@ class TimelineQuery
     {
         if (null === $this->_root) {
             $this->_root = new TimelineRoot();
-            \OC::$server->get(FsManager::class)->populateRoot($this->_root);
+            $this->_root->populate();
         }
 
         return $this->_root;

lib/Db/TimelineRoot.php

@@ -17,6 +17,14 @@ class TimelineRoot
     {
     }
 
+    /**
+     * Populate the root with the current user's folders.
+     */
+    public function populate()
+    {
+        \OC::$server->get(FsManager::class)->populateRoot($this);
+    }
+
     /**
      * Add a folder to the root.
      *