/// <summary>
/// Returns <c>true</c> if the provided position is in a hidden region inaccessible to the user.
/// </summary>
public static bool IsHiddenPosition(this SyntaxTree tree, int position, CancellationToken cancellationToken = default(CancellationToken))
{
if (!tree.HasHiddenRegions())
{
return(false);
}
var lineVisibility = tree.GetLineVisibility(position, cancellationToken);
return(lineVisibility == LineVisibility.Hidden || lineVisibility == LineVisibility.BeforeFirstLineDirective);
}