Refresh a tab when it switches in

src/HexManiac.Core/ViewModels/EditorViewModel.cs

@@ -208,6 +208,7 @@ namespace HavenSoft.HexManiac.Core.ViewModels {
                if (TryUpdate(ref selectedIndex, value)) {
                   findPrevious.CanExecuteChanged.Invoke(findPrevious, EventArgs.Empty);
                   findNext.CanExecuteChanged.Invoke(findNext, EventArgs.Empty);
+                  if (selectedIndex >= 0 && selectedIndex < tabs.Count) tabs[selectedIndex].Refresh();
                   UpdateGotoViewModel();
                   foreach (var edit in QuickEdits) edit.TabChanged();
                }

src/HexManiac.Core/ViewModels/ITabContent.cs

@@ -27,5 +27,7 @@ namespace HavenSoft.HexManiac.Core.ViewModels {
       event EventHandler<ITabContent> RequestTabChange;
       event EventHandler<Action> RequestDelayedWork;
       event EventHandler RequestMenuClose;
+
+      void Refresh();
    }
 }

src/HexManiac.Core/ViewModels/SearchResultsViewPort.cs

@@ -214,6 +214,8 @@ namespace HavenSoft.HexManiac.Core.ViewModels {
          }) { ShortcutText = "Ctrl+Click" } };
       }
 
+      public void Refresh() { }
+
       private void NotifyCollectionChanged() {
          if (children.Count == 0) return;
          UpdateHeaders();

src/HexManiac.Tests/GeneralAppTests.cs

@@ -446,6 +446,20 @@ namespace HavenSoft.HexManiac.Tests {
          Assert.Equal(0x100, newTab.DataOffset);                          // the new tab is scrolled to the desired location
       }
 
+      [Fact]
+      public void TabGetsRefreshedWhenSwitchedIn() {
+         int count = 0;
+         var tab1 = new StubTabContent { Refresh = () => count++ };
+         var tab2 = new StubTabContent();
+         editor.Add(tab1);
+         count = 0;
+
+         tab1.RequestTabChange?.Invoke(tab1, tab2);
+         editor.SelectedIndex = 0;
+
+         Assert.Equal(1, count);
+      }
+
       private StubTabContent CreateClosableTab() {
          var tab = new StubTabContent();
          var close = new StubCommand { CanExecute = arg => true };