public static async Task <Document> RefactorAsync(
Document document,
BinaryExpressionSyntax binaryExpression,
bool multiline = false,
CancellationToken cancellationToken = default(CancellationToken))
{
SyntaxNode root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var chain = new StringLiteralChain(binaryExpression);
LiteralExpressionSyntax newNode = (multiline)
? chain.MergeMultiline()
: chain.Merge();
root = root.ReplaceNode(
binaryExpression,
newNode.WithFormatterAnnotation());
return(document.WithSyntaxRoot(root));
}