Demote switchMap and combineLatest to preview features as we may want to rework in #1262 and #1335

Author: qwwdfsad

kotlinx-coroutines-core/common/src/flow/operators/Merge.kt

@@ -125,7 +125,7 @@ public fun <T> Flow<Flow<T>>.flattenMerge(concurrency: Int = DEFAULT_CONCURRENCY
  * ```
  * produces `aa bb b_last`
  */
-@ExperimentalCoroutinesApi
+@FlowPreview
 public fun <T, R> Flow<T>.switchMap(transform: suspend (value: T) -> Flow<R>): Flow<R> = scopedFlow { downstream ->
     var previousFlow: Job? = null
     collect { value ->

kotlinx-coroutines-core/common/src/flow/operators/Zip.kt

@@ -28,7 +28,7 @@ import kotlinx.coroutines.flow.unsafeFlow as flow
  * }
  * ```
  */
-@ExperimentalCoroutinesApi
+@FlowPreview
 public fun <T1, T2, R> Flow<T1>.combineLatest(other: Flow<T2>, transform: suspend (T1, T2) -> R): Flow<R> = flow {
     coroutineScope {
         val firstChannel = asFairChannel(this@combineLatest)
@@ -80,7 +80,7 @@ public fun <T1, T2, R> Flow<T1>.combineLatest(other: Flow<T2>, transform: suspen
  * Returns a [Flow] whose values are generated with [transform] function by combining
  * the most recently emitted values by each flow.
  */
-@ExperimentalCoroutinesApi
+@FlowPreview
 public inline fun <T1, T2, T3, R> Flow<T1>.combineLatest(
     other: Flow<T2>,
     other2: Flow<T3>,
@@ -97,7 +97,7 @@ public inline fun <T1, T2, T3, R> Flow<T1>.combineLatest(
  * Returns a [Flow] whose values are generated with [transform] function by combining
  * the most recently emitted values by each flow.
  */
-@ExperimentalCoroutinesApi
+@FlowPreview
 public inline fun <T1, T2, T3, T4, R> Flow<T1>.combineLatest(
     other: Flow<T2>,
     other2: Flow<T3>,
@@ -116,7 +116,7 @@ public inline fun <T1, T2, T3, T4, R> Flow<T1>.combineLatest(
  * Returns a [Flow] whose values are generated with [transform] function by combining
  * the most recently emitted values by each flow.
  */
-@ExperimentalCoroutinesApi
+@FlowPreview
 public inline fun <T1, T2, T3, T4, T5, R> Flow<T1>.combineLatest(
     other: Flow<T2>,
     other2: Flow<T3>,
@@ -137,7 +137,7 @@ public inline fun <T1, T2, T3, T4, T5, R> Flow<T1>.combineLatest(
  * Returns a [Flow] whose values are generated with [transform] function by combining
  * the most recently emitted values by each flow.
  */
-@ExperimentalCoroutinesApi
+@FlowPreview
 public inline fun <reified T, R> Flow<T>.combineLatest(vararg others: Flow<T>, crossinline transform: suspend (Array<T>) -> R): Flow<R> =
     combineLatest(*others, arrayFactory = { arrayOfNulls(others.size + 1) }, transform = { transform(it) })