Merge branch 'master' into mrazator/delta-based-sync

excalidraw-app/collab/Collab.tsx

@@ -310,7 +310,13 @@ class Collab extends PureComponent<CollabProps, CollabState> {
       //  the purpose is to run in immediately after user decides to stay
       this.saveCollabRoomToFirebase(syncableElements);
 
-      preventUnload(event);
+      if (import.meta.env.VITE_APP_DISABLE_PREVENT_UNLOAD !== "true") {
+        preventUnload(event);
+      } else {
+        console.warn(
+          "preventing unload disabled (VITE_APP_DISABLE_PREVENT_UNLOAD)",
+        );
+      }
     }
   });