Fix locking multiple threads during KotlinConfiguration check

#KT-29892 Fixed

idea/idea-jvm/src/org/jetbrains/kotlin/idea/configuration/ui/KotlinConfigurationCheckerComponent.kt

@@ -36,6 +36,7 @@ import org.jetbrains.kotlin.idea.configuration.ui.notifications.notifyKotlinStyl
 import org.jetbrains.kotlin.idea.project.getAndCacheLanguageLevelByDependencies
 import org.jetbrains.kotlin.idea.versions.collectModulesWithOutdatedRuntime
 import org.jetbrains.kotlin.idea.versions.findOutdatedKotlinLibraries
+import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.atomic.AtomicInteger
 
 class KotlinConfigurationCheckerComponent(val project: Project) : ProjectComponent {
@@ -44,13 +45,21 @@ class KotlinConfigurationCheckerComponent(val project: Project) : ProjectCompone
     @Volatile
     private var notificationPostponed = false
 
-    init {
+    private val moduleRootListener = object : ModuleRootListener {
-        NotificationsConfiguration.getNotificationsConfiguration()
+
-            .register(CONFIGURE_NOTIFICATION_GROUP_ID, NotificationDisplayType.STICKY_BALLOON, true)
+        private val checkInProgress = AtomicBoolean(false)
+
+        private val modulesUpdatedDuringCheck = AtomicBoolean(false)
 
-        val connection = project.messageBus.connect()
-        connection.subscribe(ProjectTopics.PROJECT_ROOTS, object : ModuleRootListener {
         override fun rootsChanged(event: ModuleRootEvent) {
+            try {
+                modulesUpdatedDuringCheck.set(true)
+                // forbid running multiple checks in parallel
+                if (!checkInProgress.compareAndSet(false, true)) return
+
+                // if during the execution of the current check the module list has updated, we should re-run this check
+                do {
+                    modulesUpdatedDuringCheck.set(false)
                     if (!project.isInitialized) return
 
                     if (notificationPostponed && !isSyncing) {
@@ -69,8 +78,21 @@ class KotlinConfigurationCheckerComponent(val project: Project) : ProjectCompone
                     }
 
                     checkHideNonConfiguredNotifications(project)
+                } while (
+                    modulesUpdatedDuringCheck.get()
+                )
+            } finally {
+                checkInProgress.set(false)
             }
-        })
+        }
+    }
+
+    init {
+        NotificationsConfiguration.getNotificationsConfiguration()
+            .register(CONFIGURE_NOTIFICATION_GROUP_ID, NotificationDisplayType.STICKY_BALLOON, true)
+
+        val connection = project.messageBus.connect()
+        connection.subscribe(ProjectTopics.PROJECT_ROOTS, moduleRootListener)
 
         connection.subscribe(ProjectDataImportListener.TOPIC, ProjectDataImportListener {
             notifyOutdatedBundledCompilerIfNecessary(project)