public override IReadOnlyList <TextChangeRange> GetChangeRanges(SourceText oldText)
{
if (oldText == null)
{
throw new ArgumentNullException(nameof(oldText));
}
if (ReferenceEquals(_oldText, oldText))
{
// check whether the bases are same one
return(_changes);
}
if (_oldText.GetChangeRanges(oldText).Count == 0)
{
// okay, the bases are different, but the contents might be same.
return(_changes);
}
if (this == oldText)
{
return(TextChangeRange.NoChanges);
}
return(ImmutableArray.Create(new TextChangeRange(new TextSpan(0, oldText.Length), _newText.Length)));
}
