From 0657cc1848a286e416b9aed7653fc3728edd0331 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?K=C3=A9vin=20Commaille?=
 <76261501+zecakeh@users.noreply.github.com>
Date: Tue, 19 Nov 2024 23:06:20 +0100
Subject: [PATCH] Fix error in ToC script at the bottom of the page (#2002)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>
---
 assets/js/toc.js                                     | 5 +++++
 changelogs/internal/newsfragments/2002.clarification | 1 +
 2 files changed, 6 insertions(+)
 create mode 100644 changelogs/internal/newsfragments/2002.clarification

diff --git a/assets/js/toc.js b/assets/js/toc.js
index af8682b3..89a83ced 100644
--- a/assets/js/toc.js
+++ b/assets/js/toc.js
@@ -107,6 +107,11 @@ function getCurrentHeading(headings, headerOffset) {
     index += 1;
   }
 
+  // At the bottom of the page we might not have a heading.
+  if (!currentHeading) {
+    currentHeading = prevHeading;
+  }
+
   return currentHeading;
 }
 
diff --git a/changelogs/internal/newsfragments/2002.clarification b/changelogs/internal/newsfragments/2002.clarification
new file mode 100644
index 00000000..5f641bff
--- /dev/null
+++ b/changelogs/internal/newsfragments/2002.clarification
@@ -0,0 +1 @@
+Improve the JS script to highlight the current ToC entry.