The store no longer needs a mutableStateSetOf: an ordinary Set kept in a
mutableStateOf does the same job, and matches DefaultMediaPreviewConfigStateStore.
The Compose state itself has to stay. TimelineProtectionPresenter derives
ProtectionState from the store inside a derivedStateOf, so the set must be a
snapshot object for a reveal to invalidate it and reach the timeline. Backing it
with a plain mutableSetOf leaves the presenter with nothing to observe and it
stops emitting after ShowContent.
hayaksi1
09efb04a8f