Analysis: Resolve opt-in experimental coroutines api warnings

1st Warning Messages: "This declaration is experimental and its usage
should be marked with '@kotlinx.coroutines.ExperimentalCoroutinesApi' or
'@OptIn(kotlinx.coroutines.ExperimentalCoroutinesApi::class)'"

Adding the '@OptIn(ExperimentalCoroutinesApi::class)' annotation on
these functions is the recommended action to resolve this 'GlobalScope'
warnings. However, this results to the below '@OptIn' warnings:

2nd Warning Message: "This annotation should be used with the
compiler argument '-Xopt-in=kotlin.RequiresOptIn'"

Adding the '-Xopt-in=kotlin.RequiresOptIn' free compiler argument is the
recommended action to resolve this '@OptIn' warning.

Author: ParaskP7

WordPress/src/main/java/org/wordpress/android/models/usecases/LocalCommentCacheUpdateHandler.kt

@@ -1,5 +1,6 @@
 package org.wordpress.android.models.usecases
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.merge
 import org.wordpress.android.models.usecases.LocalCommentCacheUpdateUseCase.PropagateCommentsUpdateAction.UpdatedComments
 import javax.inject.Inject
@@ -11,6 +12,7 @@ class LocalCommentCacheUpdateHandler @Inject constructor(
 ) {
     private val useCases = listOf(localCommentCacheUpdateUseCase)
 
+    @OptIn(ExperimentalCoroutinesApi::class)
     fun subscribe() = useCases.map { it.subscribe() }.merge()
 
     suspend fun requestCommentsUpdate() = localCommentCacheUpdateUseCase.manageAction(

WordPress/src/main/java/org/wordpress/android/models/usecases/UnifiedCommentsListHandler.kt

@@ -1,5 +1,6 @@
 package org.wordpress.android.models.usecases
 
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.merge
 import org.wordpress.android.models.usecases.BatchModerateCommentsUseCase.ModerateCommentsAction.OnModerateComments
 import org.wordpress.android.models.usecases.BatchModerateCommentsUseCase.Parameters.ModerateCommentsParameters
@@ -21,6 +22,7 @@ class UnifiedCommentsListHandler @Inject constructor(
 ) {
     private val useCases = listOf(paginateCommentsUseCase, batchModerationUseCase, moderationWithUndoUseCase)
 
+    @OptIn(ExperimentalCoroutinesApi::class)
     fun subscribe() = useCases.map { it.subscribe() }.merge()
 
     suspend fun requestPage(parameters: GetPageParameters) = paginateCommentsUseCase.manageAction(

WordPress/src/main/java/org/wordpress/android/ui/utils/ConcurrentContinuationWrapper.kt

@@ -1,6 +1,7 @@
 package org.wordpress.android.ui.utils
 
 import kotlinx.coroutines.CancellableContinuation
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.suspendCancellableCoroutine
 
 class ConcurrentContinuationWrapper<T> : ContinuationWrapper<T> {
@@ -18,6 +19,7 @@ class ConcurrentContinuationWrapper<T> : ContinuationWrapper<T> {
         }
     }
 
+    @OptIn(ExperimentalCoroutinesApi::class)
     override fun continueWith(t: T) {
         continuationList.removeFirstOrNull()?.let {
             if (it.isActive) {

build.gradle

@@ -113,6 +113,9 @@ allprojects {
     tasks.withType(KotlinCompile).all {
         kotlinOptions {
             jvmTarget = JavaVersion.VERSION_1_8
+            freeCompilerArgs += [
+                    "-Xopt-in=kotlin.RequiresOptIn"
+            ]
         }
     }
 }