Use AdwAboutDialog

countdown/main.py

@@ -33,16 +33,15 @@ class Application(Adw.Application):
         self.set_accels_for_action("win.set-timer", ("<Ctrl>t", ))
 
     def _on_about(self, action: Gio.SimpleAction, param: None) -> None:
-        about = Adw.AboutWindow(
+        about = Adw.AboutDialog(
             application_icon="timer",
             application_name="Countdown",
-            copyright="Copyright 2016–2022 Bruce Cowan",
+            copyright="Copyright 2016–2024 Bruce Cowan",
             developer_name="Bruce Cowan",
             license_type=Gtk.License.LGPL_3_0,
-            transient_for=self.props.active_window,
             version=config.VERSION,
         )
-        about.present()
+        about.present(self.props.active_window)
 
 
 def main():