[web][Link] Cleanup event listeners on hot restart #148133
Description
When the Link widget is used, it attaches some global event listeners. These listeners are leaked when a hot-restart occurs.
My first (failing) attempt was:
developer.registerExtension('ext.flutter.disassemble', (_, __) {
_detachGlobalListeners();
return Future<developer.ServiceExtensionResponse>.value(
developer.ServiceExtensionResponse.result('OK'),
);
});but it throws the following error:
Invalid argument(s): Extension already registered: ext.flutter.disassemble