From 4b6ce6e6e17b95734cee0fd385933797310d440d Mon Sep 17 00:00:00 2001
From: Jiuqing Song <jisong@microsoft.com>
Date: Fri, 22 Apr 2022 09:15:48 -0700
Subject: [PATCH] Fix memory leak in demo site (#921)

* Fix memory leak in demo site

* fix
---
 demo/scripts/controls/sidePane/SidePane.tsx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/demo/scripts/controls/sidePane/SidePane.tsx b/demo/scripts/controls/sidePane/SidePane.tsx
index aa79b15e0f7..b508187d53c 100644
--- a/demo/scripts/controls/sidePane/SidePane.tsx
+++ b/demo/scripts/controls/sidePane/SidePane.tsx
@@ -28,6 +28,10 @@ export default class SidePane extends React.Component<SidePaneProps, SidePaneSta
         this.updateStateFromHash();
     }
 
+    componentWillUnmount() {
+        window.removeEventListener('hashchange', this.updateStateFromHash);
+    }
+
     render() {
         let className = (this.props.className || '') + ' ' + styles.sidePane;
         return (