title: How to change the attributes of only future text in an NSTextStorage?
body: <p>Good day,</p>
  <p>i'll like to know how I can change the attributes of only future text in an NSTextStorage, setting the attributes of the textStorage changes all the text in the Text Storage not future text. if anyone could assist me with this. it would be highly appreciated.</p>
  <p>Thank you</p>