iOS WKWebView findString not selecting and scrolling

Since iOS 14 WebKit supports findString, but there is no documentation whatsoever yet.

However on the WWDC Sessions Discover WKWebView enhancements they mention that is a basic functionality for "Find on Page", where you can find a string and the WebView will select it and scroll to center it.

It seems very easy to use and to be finding the string as I get a result of matchFound true, but there is no selection and there is no scrolling. Maybe I'm missing something?

This is the code I have tried:

let webView = WKWebView()
    
// ...
// after loading a website with the desired string on it.
// ...
    
webView.find("hello world") { result in
    print(result.matchFound) // true
}

[Wenson Hsieh]

FWIW, the documentation does suggest that the matching range ought to be selected and scrolled into view:

```
/* @abstract Searches the page contents for the given string.
 @param string The string to search for.
 @param configuration A set of options configuring the search.
 @param completionHandler A block to invoke when the search completes.
 @discussion If the WKFindConfiguration is nil, all of the default WKFindConfiguration values will be used.
  A match found by the search is selected and the page is scrolled to reveal the selection.
  The completion handler is called after the search completes.
*/
- (void)findString:(NSString *)string withConfiguration:(nullable WKFindConfiguration *)configuration completionHandler:(void (^)(WKFindResult *result))completionHandler NS_REFINED_FOR_SWIFT WK_API_AVAILABLE(macos(11.0), ios(14.0));
```

[Radar WebKit Bug Importer]

<rdar://problem/80034358>