Preserve /// <inheritdoc/> in top level types, add unit test

Author: Sergio0694

src/CommunityToolkit.Mvvm.SourceGenerators/Models/HierarchyInfo.Syntax.cs

@@ -68,6 +68,10 @@ public CompilationUnitSyntax GetCompilationUnit(
 
         if (Namespace is "")
         {
+            // Special case for top level types with no namespace: we need to re-add the
+            // inheritdoc XML comment, as otherwise the call below would remove it.
+            syntaxTriviaList = syntaxTriviaList.Add(Comment("/// <inheritdoc/>"));
+
             // If there is no namespace, attach the pragma directly to the declared type,
             // and skip the namespace declaration. This will produce code as follows:
             //

tests/CommunityToolkit.Mvvm.SourceGenerators.UnitTests/Test_SourceGeneratorsCodegen.cs

@@ -1538,6 +1538,41 @@ public string? A
 #endif
     }
 
+    [TestMethod]
+    public void RelayCommandMethodInTopLevelTypeWithNoNamespace_PreservesInheritdoc()
+    {
+        string source = """
+            using CommunityToolkit.Mvvm.Input;
+            
+            partial class MyViewModel
+            {
+                [RelayCommand]
+                private void Test()
+                {
+                }
+            }
+            """;
+
+        string result = """
+            // <auto-generated/>
+            #pragma warning disable
+            #nullable enable
+            /// <inheritdoc/>
+            partial class MyViewModel
+            {
+                /// <summary>The backing field for <see cref="TestCommand"/>.</summary>
+                [global::System.CodeDom.Compiler.GeneratedCode("CommunityToolkit.Mvvm.SourceGenerators.RelayCommandGenerator", "8.2.0.0")]
+                private global::CommunityToolkit.Mvvm.Input.RelayCommand? testCommand;
+                /// <summary>Gets an <see cref="global::CommunityToolkit.Mvvm.Input.IRelayCommand"/> instance wrapping <see cref="Test"/>.</summary>
+                [global::System.CodeDom.Compiler.GeneratedCode("CommunityToolkit.Mvvm.SourceGenerators.RelayCommandGenerator", "8.2.0.0")]
+                [global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+                public global::CommunityToolkit.Mvvm.Input.IRelayCommand TestCommand => testCommand ??= new global::CommunityToolkit.Mvvm.Input.RelayCommand(new global::System.Action(Test));
+            }
+            """;
+
+        VerifyGenerateSources(source, new[] { new RelayCommandGenerator() }, ("MyViewModel.Test.g.cs", result));
+    }
+
     /// <summary>
     /// Generates the requested sources
     /// </summary>