Add previousBackStackEntryFlow in NavController and NavController.previousBackStackEntryAsState
#740
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…r.previousBackStackEntryAsState` with their KDocs copied and adapted from related functions, and extract a common `List<NavBackStackEntry>.getPreviousBackStackEntry` function
This was referenced Jan 4, 2025
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Proposed Changes
Add
previousBackStackEntryFlowinNavControllerandNavController.previousBackStackEntryAsStateSee Observe
navController.previousBackStackEntryas a state google-developer-training/basic-android-kotlin-compose-training-cupcake#121 for an example use case.Testing
Test: I did not add any tests yet. I can add tests if these new APIs and their implementations are considered OK.
Issues Related
Related: https://issuetracker.google.com/issues/198449626