[Gradle] Fixup testDetectingDifferentClassLoaders in respect of ^KT-50592 and KT-50598

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt

@@ -1035,6 +1035,14 @@ class KotlinGradleIT : BaseGradleIT() {
         }
 
         build("publish", "-PmppProjectDependency=true") {
+            assertFailed()
+            assertContains(MULTIPLE_KOTLIN_PLUGINS_LOADED_WARNING)
+        }
+
+        //https://youtrack.jetbrains.com/issue/KT-50598
+        val withoutDaemon= defaultBuildOptions().copy(withDaemon = false)
+
+        build("-PmppProjectDependency=true", options = withoutDaemon) {
             assertSuccessful()
             assertContains(MULTIPLE_KOTLIN_PLUGINS_LOADED_WARNING)
 
@@ -1045,7 +1053,7 @@ class KotlinGradleIT : BaseGradleIT() {
         }
 
         // Test the flag that turns off the warnings
-        build("publish", "-PmppProjectDependency=true", "-Pkotlin.pluginLoadedInMultipleProjects.ignore=true") {
+        build("-PmppProjectDependency=true", "-Pkotlin.pluginLoadedInMultipleProjects.ignore=true", options = withoutDaemon) {
             assertSuccessful()
             assertNotContains(MULTIPLE_KOTLIN_PLUGINS_LOADED_WARNING)
             assertNotContains(MULTIPLE_KOTLIN_PLUGINS_SPECIFIC_PROJECTS_WARNING)

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/compilerRunner/GradleKotlinCompilerRunner.kt

@@ -273,6 +273,7 @@ internal open class GradleCompilerRunner(
 
             gradle.taskGraph.allTasks.forEach { task ->
                 val project = task.project
+                // TODO REVIEW: Should this fail or be lenient on isolated classpaths (and therefore failing cast)?
                 if (project.multiplatformExtensionOrNull != null) {
                     // Just record this, we'll process them later
                     val tasksInProject = multiplatformProjectTasks[project] ?: mutableSetOf()

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPluginInMultipleProjectsHolder.kt

@@ -11,6 +11,9 @@ import org.gradle.api.plugins.ExtraPropertiesExtension
 internal class KotlinPluginInMultipleProjectsHolder(
     private val trackPluginVersionsSeparately: Boolean
 ) {
+    // Storing this property here might be considered the reason
+    // why the corresponding warning message is just shown in the first build
+    // https://youtrack.jetbrains.com/issue/KT-50598
     private var loadedInProjectPath: String? = null
 
     fun addProject(
@@ -97,4 +100,4 @@ const val MULTIPLE_KOTLIN_PLUGINS_LOADED_WARNING: String =
 const val MULTIPLE_KOTLIN_PLUGINS_SPECIFIC_PROJECTS_WARNING: String =
     "The Kotlin plugin was loaded in the following projects: "
 
-const val MULTIPLE_KOTLIN_PLUGINS_SPECIFIC_PROJECTS_INFO: String = "The full list of projects that loaded the Kotlin plugin is: "
+const val MULTIPLE_KOTLIN_PLUGINS_SPECIFIC_PROJECTS_INFO: String = "The full list of projects that loaded the Kotlin plugin is: "