 

      </div>
    <div class="jd-details-descr">
      
  <div class="jd-tagdata jd-tagdescr"><p>This method is called when the buffer is going to replace the
 range <code>dstart &hellip; dend</code> of <code>dest</code>
 with the new text from the range <code>start &hellip; end</code>
 of <code>source</code>.  Returns the CharSequence that we want
 placed there instead, including an empty string
 if appropriate, or <code>null</code> to accept the original
 replacement.  Be careful to not to reject 0-leng