tree 387318e52641095bdfc6898649be21966ad6f307
parent 97f22945e1f75959d957158737d4a11101a771fc
author Jeremy Woods <jbwoods@google.com> 1701819524 +0000
committer Jeremy Woods <jbwoods@google.com> 1701820328 +0000

Add additional support for BackStackChangedListeners

Now that we have Predictive back support in Fragments, we can expose the
backEvent outside of the FragmentManager via the
OnBackStackChangedListeners.

This change provides two additional callbacks:
1. OnBackStackChangeProgressed which is called whenever there is a progress
event during the predictive back gesture.
2. OnBackStackChangeCancelled which is called whenever a predictive back
   event is cancelled.

RelNote: "`FragmentManager.OnBackStackChangedListener()` now provides
APIs for receive predictive back progress and cancelled events."
Test: modified tests to include these cases
Bug: 258863095

Change-Id: I84e0fdea5a0d8c5c3c15116513533c9a7545b0a9