and switch to a different workspace where you start typing.
The popup of the other program should appear and capture your input.
As far as I know, i3 has no prevention for that.
(In this example I'm spawning a program delayed to demonstrate that, but the same can happen to e.g. the gpg-agent password prompt popping up when an SSH connection that uses it reconnects, a chat window from an IM program, and so on. I think the idea of Wayland window activation / focus stealing prevention is that you can still have those windows pop up, but without them taking your input.)
