FlutterViewController should not show the Launch storyboard in add2app scenarios #24420
Description
Even with flutter/engine#6834, the following code will result in a flash of the launch storyboard.
FlutterViewController* flutterViewController =
[[FullScreenViewController alloc] init];
flutterViewController.splashScreenView = nil;
[self.navigationController pushViewController:flutterViewController
animated:NO];Pre-warming the engine makes it marginally better but not much, e.g.:
// marginally better, but still flashes
FlutterViewController* flutterViewController =
[[FlutterViewController alloc] initWithEngine:[self engine]
nibName:nil
bundle:nil];
flutterViewController.splashScreenView = nil;
[self.navigationController pushViewController:flutterViewController
animated:YES];still flashes the launch screen.
/cc @jamesderlin