TextView event `tapLink` also fires when regular text is tapped

### Problem description

Using a `onTapLink` listener on iOS fires the listener event when the link is not directly touched but only the text around the link.

### Expected behavior

Only fire the `tapLink` listener when the link is tapped.

### Environment

- Tabris.js version: 3.4
- Device: iPhone 6
- OS: iOS 13.4

### Code snippet

```javascript
console.warn('link tapped')}
text='markupEnabled onTapLink link'/>
```

Start by reproducing the supplied TextView markup and onTapLink example on iOS with Tabris.js 3.4, then trace the TextView tapLink event handling. Done means the listener fires when the link is tapped but not when surrounding regular text is tapped.

Written by the indexing model from the issue text.