Frequency navigation WIP

src/Core/FileTime.Core.Abstraction/Models/IItem.cs

@@ -1,4 +1,5 @@
 using System.Reactive.Linq;
+using DynamicData;
 using FileTime.Core.ContentAccess;
 using FileTime.Core.Enums;
 using FileTime.Core.Timeline;
@@ -21,7 +22,7 @@ public interface IItem
     string? Attributes { get; }
     AbsolutePathType Type { get; }
     PointInTime PointInTime { get; }
-    IObservable<IEnumerable<Exception>> Exceptions { get; }
+    IObservable<IChangeSet<Exception>> Exceptions { get; }
     ReadOnlyExtensionCollection Extensions { get; }
 
     T? GetExtension<T>() => (T?)Extensions.FirstOrDefault(i => i is T);

src/Core/FileTime.Core.Abstraction/Models/TabLocationChanged.cs

@@ -0,0 +1,15 @@
+using FileTime.Core.Services;
+
+namespace FileTime.Core.Models;
+
+public class TabLocationChanged : EventArgs
+{
+    public FullName Location { get; }
+    public ITab Tab { get; }
+    
+    public TabLocationChanged(FullName location, ITab tab)
+    {
+        Location = location;
+        Tab = tab;
+    }
+}

src/Core/FileTime.Core.Abstraction/Services/ITabEvents.cs

@@ -0,0 +1,9 @@
+using FileTime.Core.Models;
+
+namespace FileTime.Core.Services;
+
+public interface ITabEvents
+{
+    event EventHandler<TabLocationChanged> LocationChanged;
+    void OnLocationChanged(ITab tab, FullName location);
+}