Microsoft.CodeAnalysis.CSharp.SignatureHelp.InvocationExpressionSignatureHelpProviderBase.GetMethodGroupItemsAndSelectionAsync(System.Collections.Immutable.ImmutableArray<Microsoft.CodeAnalysis.IMethodSymbol>, Microsoft.CodeAnalysis.Document, Microsoft.CodeAnalysis.CSharp.Syntax.InvocationExpressionSyntax, Microsoft.CodeAnalysis.SemanticModel, Microsoft.CodeAnalysis.SymbolInfo, Microsoft.CodeAnalysis.IMethodSymbol, System.Threading.CancellationToken)