Open Radar

 
When displaying HTML in a UITextView/UILabel if the document ends in a tag `</b>` or `</i>` the fontDescriptor on the font on the underlying label changes. But if there is a blank character, or a character not wrapped in an html tag, the font is unchanged.


Playground that recreates the issue

```
import UIKit

var htmlChangesFont = "<i>Testing Test</i>"
var htmlDoesntChangeFont = "<i>Testing Test</i> "

let textView = UITextView()
textView.font = UIFont.systemFont(ofSize: 12)
print(textView.font!.fontDescriptor)
/*
Prints out:
 UICTFontDescriptor <0x600001881020> = {
     NSCTFontUIUsageAttribute = CTFontRegularUsage;
     NSFontSizeAttribute = 12;
 }
*/

let data = html.data(using: .utf8)!

let options: [NSAttributedString.DocumentReadingOptionKey: Any] = [
    .documentType: NSAttributedString.DocumentType.html,
    .characterEncoding: NSNumber(value: String.Encoding.utf8.rawValue),
]


let attributedString = try? NSMutableAttributedString(data: data, options: options,
                                                      documentAttributes: nil)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center

let range = NSRange(location: 0, length: attributedString?.length ?? 0)
attributedString?.addAttribute(.paragraphStyle, value: paragraphStyle, range: range)

textView.attributedText = attributedString
print(textView.font!.fontDescriptor)
/*
Prints out:
 UICTFontDescriptor <0x6000018950e0> = {
     NSFontNameAttribute = "TimesNewRomanPS-ItalicMT";
     NSFontSizeAttribute = 12;
 }
*/
```