private async Task <Document> AddNewLineToAttribute(Document document, AttributeListSyntax attribute, CancellationToken cancellationToken)
{
var leadingWhitespace = attribute.HasLeadingTrivia ?
attribute.GetLeadingTrivia().Last()
: SyntaxFactory.ElasticWhitespace("");
var newAttribute = GetNodeWithTrailingEOL(attribute.WithoutTrailingTrivia());
newAttribute = newAttribute
.WithTrailingTrivia(newAttribute
.GetTrailingTrivia()
.Add(leadingWhitespace));
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
root = root.ReplaceNode(attribute, newAttribute);
return(document.WithSyntaxRoot(root));
}