Poll authors redirected to admin/content/poll

I don't know how to code a "return to where you were when you clicked /poll/add" route.

What I've done as a workaround may be useful to someone (replacing WHATEVER as needed)

• Step one: create new route in poll.routing.yml

poll.poll_WHATEVER:
	  path: '/WHATEVER'
	  defaults:
	    _title: 'WHATEVER'

• Step two: change route name in poll/src/Form/PollForm.php to use the new route instead of poll.poll_list
This is currently line 70. Looks like this: $form_state->setRedirect('poll.poll_list');

Of course, this approach requires re-hacking after any update to poll module.