Fix Global Usings One Per Project (#3648)

Issues with a single file where invalid usings exist.

<!-- Please be sure to read the
[Contribute](https://github.com/reactiveui/reactiveui#contribute)
section of the README -->

**What kind of change does this PR introduce?**
<!-- Bug fix, feature, docs update, ... -->

Fix

**What is the current behavior?**
<!-- You can also link to an open issue here. -->

A single GlobalUsing file is used

**What is the new behavior?**
<!-- If this is a feature change -->

Multiple GlobalUsing files are used to remove the issue where usings are
included that are invalid for some projects

**What might this PR break?**

none expected

**Please check if the PR fulfills these requirements**
- [ ] Tests for the changes have been added (for bug fixes / features)
- [ ] Docs have been added / updated (for bug fixes / features)

**Other information**:

src/Directory.build.props

@@ -70,10 +70,6 @@
     <None Include="$(MSBuildThisFileDirectory)..\README.md" Pack="true" PackagePath="\" />
   </ItemGroup>
 
-  <ItemGroup Condition="$(MSBuildProjectName.Contains('Fody')) != 'true'">
-    <Compile Include="$(MSBuildThisFileDirectory)GlobalUsings.cs" />
-  </ItemGroup>
-
   <ItemGroup>	
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.6.133" PrivateAssets="all" />	
     <PackageReference Include="stylecop.analyzers" Version="1.2.0-beta.507" PrivateAssets="all" />

src/ReactiveUI.AndroidSupport/GlobalUsings.cs

@@ -0,0 +1,16 @@
+// Copyright (c) 2023 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+global using global::Splat;
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.ComponentModel;
+global using global::System.Diagnostics.CodeAnalysis;
+global using global::System.Linq;
+global using global::System.Reactive;
+global using global::System.Reactive.Linq;
+global using global::System.Reactive.Subjects;
+global using global::System.Reactive.Threading.Tasks;
+global using global::System.Threading.Tasks;

src/ReactiveUI.AndroidSupport/ReactiveAppCompatActivity.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 using Android.App;
 using Android.Content;
 using Android.Runtime;
@@ -194,4 +191,4 @@ protected override void Dispose(bool disposing)
 
         base.Dispose(disposing);
     }
-}
+}

src/ReactiveUI.AndroidSupport/ReactiveDialogFragment.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 namespace ReactiveUI.AndroidSupport;
 
 /// <summary>

src/ReactiveUI.AndroidSupport/ReactiveFragment.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 namespace ReactiveUI.AndroidSupport;
 
 /// <summary>

src/ReactiveUI.AndroidSupport/ReactiveFragmentActivity.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 using Android.App;
 using Android.Content;
 using Android.Support.V4.App;

src/ReactiveUI.AndroidSupport/ReactivePagerAdapter.cs

@@ -4,7 +4,6 @@
 // See the LICENSE file in the project root for full license information.
 
 using System.Collections.Specialized;
-using System.Diagnostics.CodeAnalysis;
 
 using Android.Support.V4.View;
 using Android.Views;

src/ReactiveUI.AndroidSupport/ReactivePreferenceFragment.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 using Android.Runtime;
 using Android.Support.V7.Preferences;
 

src/ReactiveUI.AndroidSupport/ReactiveRecyclerViewAdapter.cs

@@ -4,7 +4,6 @@
 // See the LICENSE file in the project root for full license information.
 
 using System.Collections.Specialized;
-using System.Diagnostics.CodeAnalysis;
 
 using Android.Support.V7.Widget;
 using Android.Views;

src/ReactiveUI.AndroidSupport/ReactiveRecyclerViewViewHolder.cs

@@ -3,8 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
 using System.Runtime.Serialization;
 

src/ReactiveUI.AndroidX/GlobalUsings.cs

@@ -0,0 +1,16 @@
+// Copyright (c) 2023 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+global using global::Splat;
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.ComponentModel;
+global using global::System.Diagnostics.CodeAnalysis;
+global using global::System.Linq;
+global using global::System.Reactive;
+global using global::System.Reactive.Linq;
+global using global::System.Reactive.Subjects;
+global using global::System.Reactive.Threading.Tasks;
+global using global::System.Threading.Tasks;

src/ReactiveUI.AndroidX/ReactiveAppCompatActivity.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 using Android.App;
 using Android.Content;
 using Android.Runtime;
@@ -196,4 +193,4 @@ protected override void Dispose(bool disposing)
 
         base.Dispose(disposing);
     }
-}
+}

src/ReactiveUI.AndroidX/ReactiveDialogFragment.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 namespace ReactiveUI.AndroidX;
 
 /// <summary>

src/ReactiveUI.AndroidX/ReactiveFragment.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 namespace ReactiveUI.AndroidX;
 
 /// <summary>

src/ReactiveUI.AndroidX/ReactiveFragmentActivity.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 using Android.App;
 using Android.Content;
 

src/ReactiveUI.AndroidX/ReactivePagerAdapter.cs

@@ -4,7 +4,6 @@
 // See the LICENSE file in the project root for full license information.
 
 using System.Collections.Specialized;
-using System.Diagnostics.CodeAnalysis;
 
 using Android.Views;
 

src/ReactiveUI.AndroidX/ReactivePreferenceFragment.cs

@@ -3,9 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
-
 using Android.Runtime;
 
 using AndroidX.Preference;

src/ReactiveUI.AndroidX/ReactiveRecyclerViewAdapter.cs

@@ -4,7 +4,6 @@
 // See the LICENSE file in the project root for full license information.
 
 using System.Collections.Specialized;
-using System.Diagnostics.CodeAnalysis;
 
 using AndroidX.RecyclerView.Widget;
 

src/ReactiveUI.AndroidX/ReactiveRecyclerViewViewHolder.cs

@@ -3,8 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
 using System.Runtime.Serialization;
 

src/ReactiveUI.Blazor/GlobalUsings.cs

@@ -0,0 +1,15 @@
+// Copyright (c) 2023 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.ComponentModel;
+global using global::System.Diagnostics.CodeAnalysis;
+global using global::System.Linq;
+global using global::System.Reactive;
+global using global::System.Reactive.Concurrency;
+global using global::System.Reactive.Disposables;
+global using global::System.Reactive.Linq;
+global using global::System.Reactive.Subjects;

src/ReactiveUI.Blazor/ReactiveComponentBase.cs

@@ -3,8 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
 
 using Microsoft.AspNetCore.Components;
@@ -134,4 +132,4 @@ protected virtual void Dispose(bool disposing)
             _disposedValue = true;
         }
     }
-}
+}

src/ReactiveUI.Blazor/ReactiveInjectableComponentBase.cs

@@ -3,8 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
-using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
 
 using Microsoft.AspNetCore.Components;

src/ReactiveUI.Blazor/ReactiveLayoutComponentBase.cs

@@ -3,7 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.ComponentModel;
 using System.Runtime.CompilerServices;
 
 using Microsoft.AspNetCore.Components;

src/ReactiveUI.Blend/GlobalUsings.cs

@@ -0,0 +1,7 @@
+// Copyright (c) 2023 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+global using global::System;
+global using global::System.Reactive.Linq;

src/ReactiveUI.Drawing/GlobalUsings.cs

@@ -0,0 +1,7 @@
+// Copyright (c) 2023 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+global using global::Splat;
+global using global::System;

src/ReactiveUI.Maui/GlobalUsings.cs

@@ -0,0 +1,17 @@
+// Copyright (c) 2023 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+global using global::Splat;
+global using global::System;
+global using global::System.ComponentModel;
+global using global::System.Linq;
+global using global::System.Linq.Expressions;
+global using global::System.Reactive;
+global using global::System.Reactive.Concurrency;
+global using global::System.Reactive.Disposables;
+global using global::System.Reactive.Linq;
+global using global::System.Reactive.Subjects;
+global using global::System.Threading;
+global using global::System.Threading.Tasks;

src/ReactiveUI.Splat.Tests/GlobalUsings.cs

@@ -0,0 +1,9 @@
+// Copyright (c) 2023 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+global using global::Splat;
+global using global::System.Collections.Generic;
+global using global::System.Linq;
+global using global::System.Reactive.Linq;

src/ReactiveUI.Testing.Tests/GlobalUsings.cs

@@ -0,0 +1,11 @@
+// Copyright (c) 2023 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.Reactive;
+global using global::System.Reactive.Linq;
+global using global::System.Reactive.Subjects;
+global using global::System.Threading.Tasks;

src/ReactiveUI.Testing.Tests/TestFixture.cs

@@ -3,8 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.Diagnostics.CodeAnalysis;
-
 namespace ReactiveUI.Testing.Tests
 {
     /// <summary>

src/ReactiveUI.Testing/GlobalUsings.cs

@@ -0,0 +1,12 @@
+// Copyright (c) 2023 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.Reactive;
+global using global::System.Reactive.Concurrency;
+global using global::System.Reactive.Disposables;
+global using global::System.Threading;
+global using global::System.Threading.Tasks;

src/ReactiveUI.Tests/API/ApiApprovalTests.cs

@@ -3,12 +3,8 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using System.Diagnostics.CodeAnalysis;
-
 using VerifyXunit;
 
-using Xunit;
-
 namespace ReactiveUI.Tests.API
 {
     /// <summary>

src/ReactiveUI.Tests/Activation/ActivatingViewModelTests.cs

@@ -3,8 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using Xunit;
-
 namespace ReactiveUI.Tests
 {
     /// <summary>

src/ReactiveUI.Tests/Activation/ActivatingViewTests.cs

@@ -3,8 +3,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-using Xunit;
-
 namespace ReactiveUI.Tests
 {
     /// <summary>

src/ReactiveUI.Tests/Activation/CanActivateViewFetcherTests.cs

@@ -7,8 +7,6 @@
 
 using ReactiveUI.Tests.Winforms;
 
-using Xunit;
-
 namespace ReactiveUI.Tests
 {
     /// <summary>

src/ReactiveUI.Tests/Activation/ViewModelActivatorTests.cs

@@ -5,8 +5,6 @@
 
 using DynamicData;
 
-using Xunit;
-
 namespace ReactiveUI.Tests
 {
     /// <summary>

src/ReactiveUI.Tests/AutoPersist/AutoPersistCollectionTests.cs

@@ -9,8 +9,6 @@
 
 using ReactiveUI.Testing;
 
-using Xunit;
-
 namespace ReactiveUI.Tests
 {
     /// <summary>