IssueTracker

Jetpack Compose version: 1.7.4

Jetpack Compose component used: runtime-saveable

Trying to save a SnapshotStateList of a saveable type throws an IllegalArgumentException, as SnapshotStateList itself can't be saved by the default saver.

For example, this throws:

rememberSaveable { mutableStateListOf<String>("") }

which feels unexpected, because this works fine:

rememberSaveable { mutableListOf<String>("") }

Exception:

java.lang.IllegalArgumentException: androidx.compose.runtime.snapshots.SnapshotStateList@2d34102 cannot be saved using the current SaveableStateRegistry. The default implementation only supports types which can be stored inside the Bundle. Please consider implementing a custom Saver for this class and pass it to rememberSaveable().