IssueTracker

Currently, when using SavedStateHandle APIs such as get(key): T, getLiveData(key): MutableLiveData, and getStateFlow(key): StateFlow simultaneously with a matching key, the SavedStateHandle synchronizes the value between them.

However, synchronizing between a MutableStateFlow and a MutableLiveData would be very challenging, and now that SavedStateHandle is Multiplatform, MutableLiveData is not available in Kotlin Multiplatform.

For this reason, we have decided to:

1. Introduce a new getMutableStateFlow(key): MutableStateFlow.
2. Introduce a new Boolean flag that makes accessing a getMutableStateFlow(key): MutableStateFlow and a getLiveData(key): MutableLiveData mutually exclusive.

Therefore, once a key is used by one of the two methods, attempting to get the other with the same key will result in an exception.

Please note that getStateFlow(key): StateFlow will remain unchanged and is not mutually exclusive with getLiveData(key): MutableLiveData to maintain backward compatibility.

These changes will also address the following feature requests: b/354497131 and b/235574686