Added test that failed on its first Undo before the change in commit 1cc5346e7a.

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Tests/Designer/ModelTests.cs

@@ -19,6 +19,7 @@
 using System;
 using System.Diagnostics;
 using System.IO;
+using System.Linq;
 using System.Text;
 using System.Windows;
 using System.Windows.Controls;
@@ -376,6 +377,81 @@ namespace ICSharpCode.WpfDesign.Tests.Designer
 			AssertLog("");
 		}
 		
+		[Test]
+		public void UndoRedoRemoveClearResetInputBindings()
+		{
+			const string originalXaml =  "<TextBlock Text=\"My text\" />";
+			
+			DesignItem textBlock = CreateCanvasContext(originalXaml);
+			UndoService s = textBlock.Context.Services.GetService<UndoService>();
+			IComponentService component = textBlock.Context.Services.Component;
+			
+			Assert.IsFalse(s.CanUndo);
+			Assert.IsFalse(s.CanRedo);
+			
+			DesignItemProperty inputbinding = textBlock.Properties["InputBindings"];
+			Assert.IsTrue(inputbinding.IsCollection);
+			
+			const string expectedXaml = @"<TextBlock Text=""My text"" Cursor=""Hand"">
+  <TextBlock.InputBindings>
+    <MouseBinding Gesture=""LeftDoubleClick"" Command=""ApplicationCommands.New"" />
+  </TextBlock.InputBindings>
+</TextBlock>";
+			
+			using (ChangeGroup changeGroup = textBlock.Context.OpenGroup("", new[] { textBlock }))
+			{
+				DesignItem di = component.RegisterComponentForDesigner(new System.Windows.Input.MouseBinding());
+				di.Properties["Gesture"].SetValue(System.Windows.Input.MouseAction.LeftDoubleClick);
+				di.Properties["Command"].SetValue("ApplicationCommands.New");
+
+				inputbinding.CollectionElements.Add(di);
+				
+				textBlock.Properties["Cursor"].SetValue(System.Windows.Input.Cursors.Hand);
+
+				changeGroup.Commit();
+			}
+			
+			Assert.IsTrue(s.CanUndo);
+			Assert.IsFalse(s.CanRedo);
+			AssertCanvasDesignerOutput(expectedXaml, textBlock.Context);
+			
+			using (ChangeGroup changeGroup = textBlock.Context.OpenGroup("", new[] { textBlock }))
+			{
+				DesignItem di = inputbinding.CollectionElements.First();
+				
+				// Remove, Clear, Reset combination caused exception at first Undo after this group commit before the issue was fixed
+				inputbinding.CollectionElements.Remove(di);
+				inputbinding.CollectionElements.Clear();
+				inputbinding.Reset();
+				
+				di = component.RegisterComponentForDesigner(new System.Windows.Input.MouseBinding());
+				di.Properties["Gesture"].SetValue(System.Windows.Input.MouseAction.LeftDoubleClick);
+				di.Properties["Command"].SetValue("ApplicationCommands.New");
+
+				inputbinding.CollectionElements.Add(di);
+				
+				textBlock.Properties["Cursor"].SetValue(System.Windows.Input.Cursors.Hand);
+
+				changeGroup.Commit(); 
+			}
+			
+			s.Undo();
+			s.Undo();
+			Assert.IsFalse(s.CanUndo);
+			Assert.IsTrue(s.CanRedo);
+			AssertCanvasDesignerOutput(originalXaml, textBlock.Context);
+			
+			s.Redo();
+			s.Redo();
+			Assert.IsTrue(s.CanUndo);
+			Assert.IsFalse(s.CanRedo);
+			AssertCanvasDesignerOutput(expectedXaml, textBlock.Context);
+			
+			Assert.IsTrue(((System.Windows.Input.InputBindingCollection)inputbinding.ValueOnInstance).Count == inputbinding.CollectionElements.Count);
+			
+			AssertLog("");
+		}
+		
 		[Test]
 		public void AddTextBoxToCanvas()
 		{