yubioath-flutter/macos/Runner/MainFlutterWindow.swift

import Cocoa
import FlutterMacOS
import window_manager

class MainFlutterWindow: NSWindow {
  override func awakeFromNib() {
    let flutterViewController = FlutterViewController.init()
    let windowFrame = self.frame
    self.contentViewController = flutterViewController
    self.setFrame(windowFrame, display: true)

    RegisterGeneratedPlugins(registry: flutterViewController)

    super.awakeFromNib()
  }
  override public func order(_ place: NSWindow.OrderingMode, relativeTo otherWin: Int) {
      super.order(place, relativeTo: otherWin)
      hiddenWindowAtLaunch()
  }
}