Add 'ILLink.Substitutions.xml' file and embed it

Author: Sergio0694

src/CommunityToolkit.Mvvm/CommunityToolkit.Mvvm.csproj

@@ -54,6 +54,11 @@
     <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
   </ItemGroup>
 
+  <!-- Include the ILLink file (to properly trim configuration switches in publish builds) -->
+  <ItemGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">
+    <EmbeddedResource Include="Properties\ILLink.Substitutions.xml" LogicalName="ILLink.Substitutions.xml" />
+  </ItemGroup>
+
   <!-- Reference CsWinRT when targeting Windows, to get the latest source generators -->
   <ItemGroup Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0-windows10.0.17763.0'))">
     <PackageReference Include="Microsoft.Windows.CsWinRT" Version="2.1.1" PrivateAssets="all" />

src/CommunityToolkit.Mvvm/Properties/ILLink.Substitutions.xml

@@ -0,0 +1,10 @@
+<linker>
+  <assembly fullname="CommunityToolkit.Mvvm">
+    <type fullname="CommunityToolkit.Mvvm.FeatureSwitches">
+
+      <!-- MVVMTOOLKIT_ENABLE_INOTIFYPROPERTYCHANGING_SUPPORT switch -->
+      <method signature="System.Boolean get_EnableINotifyPropertyChangingSupport()" body="stub" value="false" feature="MVVMTOOLKIT_ENABLE_INOTIFYPROPERTYCHANGING_SUPPORT" featurevalue="false"/>
+      <method signature="System.Boolean get_EnableINotifyPropertyChangingSupport()" body="stub" value="true" feature="MVVMTOOLKIT_ENABLE_INOTIFYPROPERTYCHANGING_SUPPORT" featurevalue="true"/>
+    </type>
+  </assembly>
+</linker>