Diff does't work with unicode

[valodzka]

In some cases diff сuts unicode charachres (cyrilic for example). Adding mb_chars to diff_lcs solves problem:

diffs = Diff::LCS.sdiff( (old_text || '').mb_chars, (new_text || '').mb_chars ) # Building symmetric diff sequence    

[alno]

Thanks, fixed.

[valodzka]

I don't understand definitely why, but this fix require change in Irwi::Comparators::Spans::NotChangedSpan (.to_s instead of simple @value)

def to_s
  @value.to_s
end

It uses some kind inspect instead of to_s otherwise

[alno]

Ok, released, i think this is because result of mb_chars in fact not a string