title: NSLinkAttributeName not clickable for unicode font
body: <p>I am using a UITextView backed by NSTextStorage. The below code for attributed string with links works well for English language. </p>
  
  <pre><code>let linkURL = NSURL(string: "reference://\(pageno)")
  var pagenoAttrString = NSMutableAttributedString(string: myString)
  let range = NSMakeRange(0, pagenoAttrString.length)
  pagenoAttrString.beginEditing()
  pagenoAttrString.addAttribute(NSLinkAttributeName, value: linkURL!, range: range)
  pagenoAttrString.endEditing()
  </code></pre>
  
  <p>The same code does not seem to work when I am switching language other than English. I do get the links in blue colour but it is not clickable.</p>