public static TextSpan GetSpan(this SourceNode node)
{
// TODO remove this after SourceNode has this method itself
var pos = node.AncestorsAndSelf().Select(item =>
{
if (item.Parent is null)
{
return(0);
}
var precedingSiblingWidth = item.Parent.Children().Take(item.IndexInParent).Sum(x => x.GetWidth());
return(precedingSiblingWidth);
}).Sum();
return(new TextSpan(pos, node.GetWidth()));
}