If a transition initiated with replaceWith, its retry is also a replace.

[cibernox]

Prior to this change retrying the transition would convert the replaceWith in
a regular transitionTo.

Example code (assuming this is an Ember route):

let transition = this.replaceWith('new.route');
transition.abort();
session.set('attemptedTransition', transition);
session.authenticate('authenticator:devise').authenticate(username, password); // Successful authentication will call `session.get('attemptedTransition').retry()`

[rwjblue]

Thanks @cibernox!