Icon, Tab state persistence

src/GuiApp/FileTime.Avalonia/Application/AppState.cs

@@ -16,6 +16,7 @@ namespace FileTime.Avalonia.Application
         private ObservableCollection<TabContainer> _tabs = new();
 
         [Property]
+        [PropertyCallMethod(nameof(SelectedTabChanged))]
         private TabContainer _selectedTab;
 
         [Property]
@@ -62,6 +63,14 @@ namespace FileTime.Avalonia.Application
             }
         }
 
+        private void SelectedTabChanged()
+        {
+            foreach(var tab in Tabs)
+            {
+                tab.IsSelected = tab == SelectedTab;
+            }
+        }
+
         private async Task TabItemMarked(TabState tabState, AbsolutePath item)
         {
             var tabContainer = Tabs.FirstOrDefault(t => t.TabState == tabState);