fix: resolve WinForms test compile errors on Windows CI

Author: glennawatson

src/tests/ReactiveUI.Binding.WinForms.Tests/CommandBinding/WinFormsCommandBindingTests.cs

@@ -192,7 +192,7 @@ public async Task Button_CustomMouseUpEvent_ExecutesCommand()
         using var binding = WinFormsCommandScenarios.ButtonCustomEvent(vm, view);
 
         // Raise MouseUp event on the button
-        var mouseArgs = new MouseEventArgs(MouseButtons.Left, 1, 0, 0, 0);
+        var mouseArgs = new System.Windows.Forms.MouseEventArgs(MouseButtons.Left, 1, 0, 0, 0);
         view.SaveButton.GetType()
             .GetMethod("OnMouseUp", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic)!
             .Invoke(view.SaveButton, [mouseArgs]);

src/tests/ReactiveUI.Binding.WinForms.Tests/CommandBinding/WinFormsCommandScenarios.cs

@@ -26,7 +26,7 @@ public static IDisposable ButtonBasic(WinFormsCommandViewModel vm, WinFormsComma
     /// <param name="view">The target view.</param>
     /// <returns>A disposable representing the binding.</returns>
     public static IDisposable ButtonWithExpressionParam(WinFormsCommandViewModel vm, WinFormsCommandView view)
-        => view.BindCommand(vm, x => x.Save, x => x.SaveButton, vm, x => x.CurrentItem);
+        => view.BindCommand(vm, x => x.Save, x => x.SaveButton, x => x.CurrentItem);
 
     /// <summary>
     /// Binds the Save command to a real WinForms Button with an observable parameter.

src/tests/ReactiveUI.Binding.WinForms.Tests/CommandBinding/WinFormsCommandViewModel.cs

@@ -12,7 +12,14 @@ namespace ReactiveUI.Binding.WinForms.Tests.CommandBinding;
 /// </summary>
 public class WinFormsCommandViewModel : INotifyPropertyChanged
 {
+    /// <summary>
+    /// The backing field for <see cref="Save"/>.
+    /// </summary>
     private ICommand? _save;
+
+    /// <summary>
+    /// The backing field for <see cref="CurrentItem"/>.
+    /// </summary>
     private string? _currentItem;
 
     /// <inheritdoc/>

src/tests/ReactiveUI.Binding.WinForms.Tests/ReactiveUI.Binding.WinForms.Tests.csproj

@@ -49,7 +49,6 @@
       </PropertyGroup>
       <ItemGroup>
         <Using Include="System.Windows.Forms" />
-        <Using Include="System.Windows.Input" />
         <ProjectReference Include="..\..\ReactiveUI.Binding.WinForms\ReactiveUI.Binding.WinForms.csproj" />
         <Compile Include="CommandBinding\**\*.cs" />
       </ItemGroup>