Parent's children, optimalizations

src/AppCommon/FileTime.App.Core.Abstraction/Services/IRxSchedulerService.cs

@@ -0,0 +1,10 @@
+using System.Reactive.Concurrency;
+
+namespace FileTime.App.Core.Services
+{
+    public interface IRxSchedulerService
+    {
+        IScheduler GetWorkerScheduler();
+        IScheduler GetUIScheduler();
+    }
+}

src/AppCommon/FileTime.App.Core.Abstraction/ViewModels/ITabViewModel.cs

@@ -15,5 +15,6 @@ namespace FileTime.App.Core.ViewModels
         IObservable<IReadOnlyList<IItemViewModel>> CurrentItems { get; }
         IObservable<IEnumerable<FullName>> MarkedItems { get; }
         IObservable<IReadOnlyList<IItemViewModel>?> SelectedsChildren { get; }
+        IObservable<IReadOnlyList<IItemViewModel>?> ParentsChildren { get; }
     }
 }