chore: fixed user notifier default notification handler

Author: ibetitsmike

App/App.xaml.cs

@@ -27,7 +27,7 @@
 
 namespace Coder.Desktop.App;
 
-public partial class App : Application, IDispatcherQueueManager, INotificationHandler
+public partial class App : Application, IDispatcherQueueManager, IDefaultNotificationHandler
 {
     private const string MutagenControllerConfigSection = "MutagenController";
     private const string UpdaterConfigSection = "Updater";
@@ -91,7 +91,7 @@ public App()
         services.AddSingleton<IAgentApiClientFactory, AgentApiClientFactory>();
 
         services.AddSingleton<IDispatcherQueueManager>(_ => this);
-        services.AddSingleton<INotificationHandler>(_ => this);
+        services.AddSingleton<IDefaultNotificationHandler>(_ => this);
         services.AddSingleton<ICredentialBackend>(_ =>
             new WindowsCredentialBackend(WindowsCredentialBackend.CoderCredentialsTargetName));
         services.AddSingleton<ICredentialManager, CredentialManager>();
@@ -340,9 +340,6 @@ public void RunInUiThread(DispatcherQueueHandler action)
     public void HandleNotificationActivation(IDictionary<string, string> args)
     {
         var app = (App)Current;
-        if (app != null && app.TrayWindow != null)
-        {
-            app.TrayWindow.Tray_Open();
-        }
+        app.TrayWindow?.Tray_Open();
     }
 }

App/Services/UserNotifier.cs

@@ -15,6 +15,12 @@ public interface INotificationHandler
     public void HandleNotificationActivation(IDictionary<string, string> args);
 }
 
+// This interface is meant to protect the default
+// notification handler from being overriden by DI.
+public interface IDefaultNotificationHandler : INotificationHandler
+{
+}
+
 public interface IUserNotifier : INotificationHandler, IAsyncDisposable
 {
     public void RegisterHandler(string name, INotificationHandler handler);
@@ -46,7 +52,7 @@ public class UserNotifier : IUserNotifier
     private ConcurrentDictionary<string, INotificationHandler> Handlers { get; } = new();
 
     public UserNotifier(ILogger<UserNotifier> logger, IDispatcherQueueManager dispatcherQueueManager,
-        INotificationHandler notificationHandler)
+        IDefaultNotificationHandler notificationHandler)
     {
         _logger = logger;
         _dispatcherQueueManager = dispatcherQueueManager;

App/Views/TrayWindow.xaml.cs

@@ -152,10 +152,13 @@ private void SetPageByState(RpcModel rpcModel, CredentialModel credentialModel,
         }
     }
 
+    /// <summary>
+    /// This method is called when the state changes, but we don't want to notify
+    /// the user if the state hasn't changed.
+    /// </summary>
+    /// <param name="rpcModel"></param>
     private void MaybeNotifyUser(RpcModel rpcModel)
     {
-        // This method is called when the state changes, but we don't want to notify
-        // the user if the state hasn't changed.
         var isRpcLifecycleChanged = rpcModel.RpcLifecycle == RpcLifecycle.Disconnected && curRpcLifecycle != rpcModel.RpcLifecycle;
         var isVpnLifecycleChanged = (rpcModel.VpnLifecycle == VpnLifecycle.Started || rpcModel.VpnLifecycle == VpnLifecycle.Stopped) && curVpnLifecycle != rpcModel.VpnLifecycle;