From b07aa6e20594c8a57197925bf5d4021342fbf8fe Mon Sep 17 00:00:00 2001
From: David Luzar <luzar.david@gmail.com>
Date: Mon, 20 Jul 2020 12:53:53 +0200
Subject: [PATCH] delay scene init until document active (#1920)

* delay scene init until document active

* use opts.once for the listener
---
 src/components/App.tsx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/components/App.tsx b/src/components/App.tsx
index 5c8c0df8..be3b2c99 100644
--- a/src/components/App.tsx
+++ b/src/components/App.tsx
@@ -474,6 +474,14 @@ class App extends React.Component<ExcalidrawProps, AppState> {
           window.history.replaceState({}, "Excalidraw", window.location.origin);
         }
       } else {
+        // https://github.com/excalidraw/excalidraw/issues/1919
+        if (document.hidden) {
+          window.addEventListener("focus", () => this.initializeScene(), {
+            once: true,
+          });
+          return;
+        }
+
         isCollaborationScene = false;
         window.history.replaceState({}, "Excalidraw", window.location.origin);
       }