Fix app crash when using many tabs (#81)

* fix: call visitableWillAppear sooner

* docs: add comment to explain fix

packages/turbo/ios/RNVisitableView.swift

@@ -45,6 +45,13 @@ class RNVisitableView: UIView, RNSessionSubscriber {
     controller.didMove(toParent: reactViewController())
     addSubview(controller.view)
   }
+
+  override func willMove(toWindow newWindow: UIWindow?) {
+    // visitableWillAppear is not called automatically sometimes. So it has to be called
+    // manually to make sure that visitableViews list is not empty
+    // see https://github.com/software-mansion-labs/react-native-turbo-demo/pull/81
+    controller.viewWillAppear(false)
+  }
 
   public func handleMessage(message: WKScriptMessage) {
     if let messageBody = message.body as? [AnyHashable : Any] {