From 02a8edd4ef1efdada60f9c07196811cc2e1fcbb0 Mon Sep 17 00:00:00 2001
From: Benjamin Popp <haven1433@gmail.com>
Date: Tue, 15 Jan 2019 21:50:00 -0600
Subject: [PATCH] fix a crash if you try to use back/forward from a search tab.

---
 .../ViewModels/SearchResultsViewPort.cs        | 18 +++++++++---------
 src/Gen3Hex.Tests/NavigationTests.cs           |  7 +++++++
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/src/Gen3Hex.Core/ViewModels/SearchResultsViewPort.cs b/src/Gen3Hex.Core/ViewModels/SearchResultsViewPort.cs
index 6360ab4c..4d661741 100644
--- a/src/Gen3Hex.Core/ViewModels/SearchResultsViewPort.cs
+++ b/src/Gen3Hex.Core/ViewModels/SearchResultsViewPort.cs
@@ -55,15 +55,15 @@ namespace HavenSoft.Gen3Hex.Core.ViewModels {
       }
       public string Name { get; }
       public string FileName => string.Empty;
-      public ICommand Save => null;
-      public ICommand SaveAs => null;
-      public ICommand Undo => null;
-      public ICommand Redo => null;
-      public ICommand Copy => null;
-      public ICommand Clear => null;
-      public ICommand Goto => null;
-      public ICommand Back => null;
-      public ICommand Forward => null;
+      public ICommand Save { get; } = new StubCommand();
+      public ICommand SaveAs { get; } = new StubCommand();
+      public ICommand Undo { get; } = new StubCommand();
+      public ICommand Redo { get; } = new StubCommand();
+      public ICommand Copy { get; } = new StubCommand();
+      public ICommand Clear { get; } = new StubCommand();
+      public ICommand Goto { get; } = new StubCommand();
+      public ICommand Back { get; } = new StubCommand();
+      public ICommand Forward { get; } = new StubCommand();
       public ICommand Close => close;
 
       public IModel Model => null;
diff --git a/src/Gen3Hex.Tests/NavigationTests.cs b/src/Gen3Hex.Tests/NavigationTests.cs
index bfb492e9..7926718b 100644
--- a/src/Gen3Hex.Tests/NavigationTests.cs
+++ b/src/Gen3Hex.Tests/NavigationTests.cs
@@ -142,6 +142,13 @@ namespace HavenSoft.Gen3Hex.Tests {
          Assert.Equal("000A00", viewPort.Headers[0]);
       }
 
+      [Fact]
+      public void CannotBackFromSearchTab() {
+         var searchTab = new SearchResultsViewPort("bob");
+         Assert.False(searchTab.Back.CanExecute(null));
+         Assert.False(searchTab.Forward.CanExecute(null));
+      }
+
       [Fact]
       public void BackRecallsYourLastScrollPosition() {
          var viewPort = new ViewPort(new LoadedFile("test.txt", new byte[0x1000])) { Width = 0x10, Height = 0x10 };