Add global usings and plumb through the WPF

Relates to dotnet/sdk#18459

Author: RussKie

pkg/Microsoft.Private.Winforms/Microsoft.Private.Winforms.csproj

@@ -58,35 +58,42 @@
       <PackagePath></PackagePath>
     </None>
   </ItemGroup>
+  
+  <ItemGroup>
+    <None Include="sdk\dotnet-wpf\*">
+      <Pack>True</Pack>
+      <PackagePath>sdk\dotnet-wpf</PackagePath>
+    </None>
+  </ItemGroup>
 
   <!-- Any projects referenced here will have their outputs automatically put into the package -->
   <!-- If you add a new csproj, and you want the outputs in the package, you must add it here -->
   <ItemGroup>
-    <!-- Facade for System.Drawing include -->
+    <!-- Facade for System.Drawing -->
     <ProjectReference Include="..\..\src\System.Drawing\src\System.Drawing.Facade.csproj" />
 
-    <!-- Facade for System.Design include -->
+    <!-- Facade for System.Design -->
     <ProjectReference Include="..\..\src\System.Design\src\System.Design.Facade.csproj" />
 
-    <!-- Facade for System.Drawing.Design include -->
+    <!-- Facade for System.Drawing.Design -->
     <ProjectReference Include="..\..\src\System.Drawing.Design\src\System.Drawing.Design.Facade.csproj" />
 
-    <!-- Reference and Source System.Windows.Forms includes -->
+    <!-- Reference and Source System.Windows.Forms -->
     <ProjectReference Include="..\..\src\System.Windows.Forms\src\System.Windows.Forms.csproj" />
 
-    <!-- Reference and Source System.Windows.Forms.Primitives includes -->
+    <!-- Reference and Source System.Windows.Forms.Primitives -->
     <ProjectReference Include="..\..\src\System.Windows.Forms.Primitives\src\System.Windows.Forms.Primitives.csproj" />
 
-    <!-- Reference and Source System.Windows.Forms.Design includes -->
+    <!-- Reference and Source System.Windows.Forms.Design -->
     <ProjectReference Include="..\..\src\System.Windows.Forms.Design\src\System.Windows.Forms.Design.csproj" />
 
-    <!-- Facade for System.Windows.Forms.Design.Editors includes -->
+    <!-- Facade for System.Windows.Forms.Design.Editors -->
     <ProjectReference Include="..\..\src\System.Windows.Forms.Design.Editors\src\System.Windows.Forms.Design.Editors.Facade3x.csproj" />
 
-    <!-- Facade for Microsoft.VisualBasic include -->
+    <!-- Facade for Microsoft.VisualBasic -->
     <ProjectReference Include="..\..\src\Microsoft.VisualBasic\src\Microsoft.VisualBasic.Facade.csproj" />
 
-    <!-- Reference and Source Microsoft.VisualBasic.Forms includes -->
+    <!-- Reference and Source Microsoft.VisualBasic.Forms -->
     <ProjectReference Include="..\..\src\Microsoft.VisualBasic.Forms\src\Microsoft.VisualBasic.Forms.vbproj" />
 
     <ProjectReference Include="..\..\src\Accessibility\src\Accessibility.ilproj" />

pkg/Microsoft.Private.Winforms/sdk/dotnet-wpf/System.Windows.Forms.GlobalUsings.props

@@ -0,0 +1,22 @@
+<!--
+    This props file comes from dotnet/winforms. It gets ingested by dotnet/wpf and processed by
+    packaging/Microsoft.NET.Sdk.WindowsDesktop project.
+    
+    It is referenced via Microsoft.NET.Sdk.WindowsDesktop/targets/Microsoft.NET.Sdk.WindowsDesktop.props.
+   -->
+
+<Project>
+
+  <ItemGroup Condition=" '$(UseWindowsForms)' == 'true' ">
+    <!--
+      SDK defines the following global usings:
+      * System
+      * System.Collections.Generic
+      * System.Linq
+      * System.Threading.Tasks
+    -->
+    <Import Include="System.Drawing" />
+    <Import Include="System.Windows.Forms" />
+  </ItemGroup>
+
+</Project>