From 9d19ce18751b4ce9185e678c6a2d94e19d42b8c6 Mon Sep 17 00:00:00 2001
From: Oskar Nyberg <oskar@mullvad.net>
Date: Mon, 22 Jan 2024 16:41:55 +0100
Subject: [PATCH] Fix CustomScrollbars off-by-one error

---
 gui/src/renderer/components/CustomScrollbars.tsx | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gui/src/renderer/components/CustomScrollbars.tsx b/gui/src/renderer/components/CustomScrollbars.tsx
index 65db8c87fe54..45e7ad521dca 100644
--- a/gui/src/renderer/components/CustomScrollbars.tsx
+++ b/gui/src/renderer/components/CustomScrollbars.tsx
@@ -542,8 +542,9 @@ class CustomScrollbars extends React.Component<IProps, IState> {
       const thumbHeight = this.computeThumbHeight(scrollable);
       thumb.style.setProperty('height', thumbHeight + 'px');
 
-      // hide thumb when there is nothing to scroll
-      const canScroll = thumbHeight < scrollable.offsetHeight;
+      // hide thumb when there is nothing to scroll. We've had issues with scrollHeight being
+      // off-by-one, to ensure this doesn't happen we subtract 1 here.
+      const canScroll = thumbHeight < scrollable.offsetHeight - 1;
       if (this.state.canScroll !== canScroll) {
         this.setState({ canScroll });