Fixing UI thread issues with bulk operations and request queue refactoring.

Wino.Core/Requests/Mail/ChangeJunkStateRequest.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using CommunityToolkit.Mvvm.Messaging;
 using Wino.Core.Domain.Entities.Mail;
 using Wino.Core.Domain.Enums;
@@ -30,6 +31,7 @@ public record ChangeJunkStateRequest(bool IsJunk, MailCopy Item, MailItemFolder
     public bool ExcludeMustHaveFolders => false;
 
     public override MailSynchronizerOperation Operation => MailSynchronizerOperation.ChangeJunkState;
+    public override object GroupingKey() => (Operation, IsJunk, FromFolder.Id, TargetFolder?.Id ?? Guid.Empty);
 
     public override void ApplyUIChanges()
     {
@@ -47,4 +49,22 @@ public class BatchChangeJunkStateRequest : BatchCollection<ChangeJunkStateReques
     public BatchChangeJunkStateRequest(IEnumerable<ChangeJunkStateRequest> collection) : base(collection)
     {
     }
+
+    public override void ApplyUIChanges()
+    {
+        var removedMails = this.Select(x => x.Item).Where(x => x != null).ToList();
+        if (removedMails.Count == 0)
+            return;
+
+        WeakReferenceMessenger.Default.Send(new BulkMailRemovedMessage(removedMails, EntityUpdateSource.ClientUpdated));
+    }
+
+    public override void RevertUIChanges()
+    {
+        var addedMails = this.Select(x => x.Item).Where(x => x != null).ToList();
+        if (addedMails.Count == 0)
+            return;
+
+        WeakReferenceMessenger.Default.Send(new BulkMailAddedMessage(addedMails, EntityUpdateSource.ClientReverted));
+    }
 }