onBackStackChangeProgressed

Called whenever a predictive back gesture is changing the back stack. This will continue to be called with an updated BackEventCompat object until the gesture is either cancelled or completed.

This is called immediately after onBackStackChangeStarted during a predictive back gesture. If the gesture is completed, this will be followed by onBackStackChangeCommitted and if it is cancelled, it will be followed by onBackStackChangeCancelled.

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