AppFlowy/frontend/appflowy_flutter/macos/Runner/AppDelegate.swift

import Cocoa
import FlutterMacOS

@NSApplicationMain
class AppDelegate: FlutterAppDelegate {
  override func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
    return false
  }

  override func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
    if !flag {
        for window in sender.windows {
            window.makeKeyAndOrderFront(self)
        }
    }

    return true
  }
}