From d56c5e63c38bcaefa9fd03124fd6dc62ed434c15 Mon Sep 17 00:00:00 2001
From: Jeremy Tuloup <jeremy.tuloup@gmail.com>
Date: Wed, 29 Dec 2021 18:45:37 +0100
Subject: [PATCH] Fix scroll toggle

---
 packages/notebook-extension/src/index.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/notebook-extension/src/index.ts b/packages/notebook-extension/src/index.ts
index 052f579c1..4102a048d 100644
--- a/packages/notebook-extension/src/index.ts
+++ b/packages/notebook-extension/src/index.ts
@@ -245,10 +245,11 @@ const scrollOutput: JupyterFrontEndPlugin<void> = {
       const height = node.getBoundingClientRect().height;
       const fontSize = parseFloat(node.style.fontSize.replace('px', ''));
       const lineHeight = (fontSize || 14) * 1.3;
-      const scroll = height > lineHeight * autoScrollThreshold;
       // do not set via cell.outputScrolled = true, as this would
       // otherwise synchronize the scrolled state to the notebook metadata
-      cell.toggleClass(SCROLLED_OUTPUTS_CLASS, scroll);
+      if (height > lineHeight * autoScrollThreshold) {
+        cell.toggleClass(SCROLLED_OUTPUTS_CLASS, true);
+      }
     };
 
     tracker.widgetAdded.connect((sender, notebook) => {