From 2fe2361828259d497934d5a87a9a95aa01237aef Mon Sep 17 00:00:00 2001
From: Max Pumperla <max.pumperla@googlemail.com>
Date: Fri, 20 Jan 2023 10:43:05 +0100
Subject: [PATCH] [docs] maintain scrollbar posiion on redirects, fixes #31789

Signed-off-by: Max Pumperla <max.pumperla@googlemail.com>
---
 doc/source/_static/js/custom.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/doc/source/_static/js/custom.js b/doc/source/_static/js/custom.js
index e745f4e140054..7db383309c9be 100644
--- a/doc/source/_static/js/custom.js
+++ b/doc/source/_static/js/custom.js
@@ -27,3 +27,19 @@ function loadVisibleTermynals() {
 window.addEventListener("scroll", loadVisibleTermynals);
 createTermynals();
 loadVisibleTermynals();
+
+// Remember the scroll position when the page is unloaded.
+window.onload = function() {
+    let sidebar = document.querySelector("#bd-docs-nav");
+
+    window.onbeforeunload = function() {
+        let scroll = sidebar.scrollTop;
+        localStorage.setItem("scroll", scroll);
+    }
+
+    let storedScrollPosition = localStorage.getItem("scroll");
+    if (storedScrollPosition) {
+        sidebar.scrollTop = storedScrollPosition;
+        localStorage.removeItem("scroll");
+    }
+};