[Opera] Selection stops updating after incorrect blur

[Piotrek Koszuliński]

1. Open attached sample and open console (on Opera ctrl+shift+i).
2. Click on the plain text inside editor, see that focus and selectionChange were logged and the selection path is *body,p*.
3. Click on the bolded text, see that selectionChange was logged and selection path is *body,p,b*.
4. Do one of:
   • click below the text (on html element),
   • click on the link inside editor,
   • apply font-size to selected text.
5. See that blur was logged.
6. Click on normal and bolded text - selection path isn't updating any more and selectionChange isn't thrown.

Note: In #9459 I was able to fix 5. - there's no blur on editor (however I don't what's happening with focus), but 6. still occurs.