private static IReadOnlyList <ImmutableArray <TextChangeRange> > GetChangesBetween(SourceText oldText, ChangedText newText)
{
var list = new List <ImmutableArray <TextChangeRange> >();
var change = newText._info;
list.Add(change.ChangeRanges);
while (change != null)
{
SourceText actualOldText;
change.WeakOldText.TryGetTarget(out actualOldText);
if (actualOldText == oldText)
{
return(list);
}
change = change.Previous;
if (change != null)
{
list.Insert(0, change.ChangeRanges);
}
}
// did not find old text, so not connected?
list.Clear();
return(list);
}