TAB navigation allows you to navigate to hidden Hyperlinks

* .NET Core Version: 3.1
* Windows version: Windows 10 64bit
* Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes

**Problem description:**

Even if the Visibility of the TextBox is set to Collapsed, you can still navigate to internal hyperlinks via TAB navigation.

This can cause unintended hyperlink processing.

**Minimal repro:**

```

LINK

```

```
private void Hyperlink_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show("Clicked");
}
```

1. Press TAB key -> Focus moves to invisible Hyperlink.
2. Press Enter key -> Hyperlink event is executed.