title: Is there a simple text diff unit for Delphi?
body: <p>For data validation, for example during migrations from one XML library to a new one, we need to make sure that the old and the new text are the same. </p>
  
  <p>For small files, comparing can be done manually, but for large files it would save time to see only the lines which are different, missing or new.</p>
  
  <p>Do you know a simple but reliable diff unit for Delphi, which can scan two documents and collect informations about lines with different content?</p>
  
  <p>The unit should support WideString (for XML text).</p>