From 8bc5ae06ed802e83361909754cee993d7afc103f Mon Sep 17 00:00:00 2001
From: Peter Savchenko <specc.dev@gmail.com>
Date: Thu, 21 Jul 2022 01:00:46 +0300
Subject: [PATCH] optimization

---
 src/frontend/js/classes/table-of-content.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/frontend/js/classes/table-of-content.js b/src/frontend/js/classes/table-of-content.js
index 682bad1..86a879c 100644
--- a/src/frontend/js/classes/table-of-content.js
+++ b/src/frontend/js/classes/table-of-content.js
@@ -288,6 +288,18 @@ export default class TableOfContent {
    * @returns {void}
    */
   scrollToActiveItemIfNeeded() {
+    /**
+     * Do nothing if the Table of Content has no internal scroll at this page
+     *
+     * @todo compute it once
+     */
+    const hasScroll = this.nodes.wrapper.scrollHeight > this.nodes.wrapper.clientHeight;
+
+    if (!hasScroll) {
+      return;
+    }
+
+
     /**
      * If some item is highlighted, check whether we need to scroll to it or not
      */