flow operator that adds pausing upstream

pausedWhen.kt

@Suppress("DeprecatedCallableAddReplaceWith")
@Deprecated("Temporary, to not use it by accident", level = DeprecationLevel.ERROR)
@ExperimentalCoroutinesApi
fun <T> Flow<T>.pausedWhen(isPaused: StateFlow<Boolean>) = flow {
    //WRONG! this impl changes context of a safe flow - violates invariant
    // - would need to be specially, correctly passed through SafeFlow
    withContext(mergePausing(currentCoroutineContext(), isPaused)) {
        emitAll(this@pausedWhen)
    }
}