title: Present ViewController on top of everything regardless of the view hierarchy in IOS 13
body: <p>In iOS 13,there is a new behaviour for modal view controller when being presented. Now it's not fullscreen by default, and when i try to change modalPresentationStyle to .fullScreen my view present and dismiss immediately.
  I'm presenting view controller with code :</p>
  
  <pre><code> if #available(iOS 13.0, *) {
  
          var popupWindow: UIWindow?
  
          let windowScene = UIApplication.shared
              .connectedScenes
              .filter { $0.activationState == .foregroundActive }
              .first
          if let windowScene = windowScene as? UIWindowScene {
              popupWindow = UIWindow(windowScene: windowScene)
          }
  
          let vc = UIViewController()
          vc.view.frame = UIScreen.main.bounds
  
          popupWindow?.frame = UIScreen.main.bounds
          popupWindow?.backgroundColor = .clear
          popupWindow?.windowLevel = UIWindow.Level.statusBar + 1
          popupWindow?.rootViewController = vc
          popupWindow?.makeKeyAndVisible()
          popupWindow?.rootViewController?.present(self, animated: true, completion: nil)
  }
  </code></pre>