Added an ActivityLock for locking into an activity state

Toolkit.Avalonia/ContentDialogHandler.cs

@@ -21,13 +21,6 @@ public class ContentDialogHandler(IDispatcher dispatcher) :
                 {
                     if (content is IPrimaryConfirmation primaryConfirmation)
                     {
-                        List<Action> postActions = [];
-                        if (content is IActivityIndicator activityIndicator)
-                        {
-                            activityIndicator.Active = true;
-                            postActions.Add(() => activityIndicator.Active = false);
-                        }
-
                         Deferral deferral = args.GetDeferral();
                         if (!await primaryConfirmation.Confirm())
                         {
@@ -36,10 +29,6 @@ public class ContentDialogHandler(IDispatcher dispatcher) :
                         }
 
                         deferral.Complete();
-                        foreach (Action action in postActions)
-                        {
-                            action.Invoke();
-                        }
                     }
                 }
             }
@@ -52,13 +41,6 @@ public class ContentDialogHandler(IDispatcher dispatcher) :
                 {
                     if (content is ISecondaryConfirmation secondaryConfirmation)
                     {
-                        List<Action> postActions = [];
-                        if (content is IActivityIndicator activityIndicator)
-                        {
-                            activityIndicator.Active = true;
-                            postActions.Add(() => activityIndicator.Active = false);
-                        }
-
                         Deferral deferral = args.GetDeferral();
                         if (!await secondaryConfirmation.Confirm())
                         {
@@ -67,10 +49,6 @@ public class ContentDialogHandler(IDispatcher dispatcher) :
                         }
 
                         deferral.Complete();
-                        foreach (Action action in postActions)
-                        {
-                            action.Invoke();
-                        }
                     }
                 }
             }

Toolkit.Foundation/AsyncLock.cs

@@ -2,18 +2,33 @@
 
 namespace Toolkit.Foundation;
 
+public class ActivityLock(IActivityIndicator activityIndicator) : AsyncLock
+{
+    public override TaskAwaiter<AsyncLock> GetAwaiter()
+    {
+        activityIndicator.Active = true;
+        return base.GetAwaiter();
+    }
+
+    public override void Dispose()
+    {
+        activityIndicator.Active = false;
+        base.Dispose();
+    }
+}
+
 public class AsyncLock(int initial = 1,
     int maximum = 1) :
     IDisposable
 {
     private readonly SemaphoreSlim semaphore = new(initial, maximum);
 
-    public void Dispose()
+    public virtual void Dispose()
     {
         semaphore.Release();
     }
 
-    public TaskAwaiter<AsyncLock> GetAwaiter() => LockAsync().GetAwaiter();
+    public virtual TaskAwaiter<AsyncLock> GetAwaiter() => LockAsync().GetAwaiter();
 
     private async Task<AsyncLock> LockAsync()
     {