Avoid VSTHRD003 diagnostic for properties on objects created by async methods

src/Microsoft.VisualStudio.Threading.Analyzers.CSharp/VSTHRD003UseJtfRunAsyncAnalyzer.cs

@@ -205,7 +205,7 @@ private void AnalyzeAwaitExpression(SyntaxNodeAnalysisContext context)
                                 containingFunc ??= CSharpUtils.GetContainingFunction(focusedExpression);
                                 if (containingFunc.Value.BlockOrExpression is not null &&
                                     CSharpUtils.FindAssignedValuesWithin(containingFunc.Value.BlockOrExpression, semanticModel, local, cancellationToken).Any(
-                                        v => v is ObjectCreationExpressionSyntax or ImplicitObjectCreationExpressionSyntax or InvocationExpressionSyntax))
+                                        v => v is ObjectCreationExpressionSyntax or ImplicitObjectCreationExpressionSyntax or InvocationExpressionSyntax or AwaitExpressionSyntax { Expression: InvocationExpressionSyntax }))
                                 {
                                     return null;
                                 }

test/Microsoft.VisualStudio.Threading.Analyzers.Tests/VSTHRD003UseJtfRunAsyncAnalyzerTests.cs

@@ -1382,6 +1382,31 @@ static async Task ListenAndWait()
         await CSVerify.VerifyAnalyzerAsync(test);
     }
 
+    [Fact]
+    public async Task DoNotReportWarningWhenAwaitingTaskPropertyOfObjectReturnedFromAsyncMethodViaLocal()
+    {
+        var test = """
+            using System.Threading.Tasks;
+
+            class JsonRpc
+            {
+                internal static Task<JsonRpc> AttachAsync() => throw new System.NotImplementedException();
+
+                internal Task Completion { get; }
+            }
+
+            class Tests
+            {
+                static async Task ListenAndWait()
+                {
+                    var jsonRpc = await JsonRpc.AttachAsync();
+                    await jsonRpc.Completion;
+                }
+            }
+            """;
+        await CSVerify.VerifyAnalyzerAsync(test);
+    }
+
     [Fact]
     public async Task ReportWarningWhenAwaitingTaskPropertyThatWasNotSetInContext()
     {