New dialog when Unsafe Browser is not enabled makes it too easy to lose work
It's a limitation of Zenity to have the action being the button with the focus by default. Otherwise, we could have put it to "Close" like initially proposed on #18598 (closed). So, either we rollback !628 (merged) (I'm not against that), either we try to add more friction.
This is a UX regression introduced by #18598 (closed).