Provide language version settings correctly for platform modules

So #KT-24546 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/project/IdeaModuleInfos.kt

@@ -424,7 +424,7 @@ interface SourceForBinaryModuleInfo : IdeaModuleInfo {
 }
 
 class PlatformModuleInfo(
-    private val platformModule: ModuleSourceInfo,
+    internal val platformModule: ModuleSourceInfo,
     private val commonModules: List<ModuleSourceInfo>
 ) : IdeaModuleInfo, CombinedModuleInfo, TrackableModuleInfo {
     override val capabilities: Map<ModuleDescriptor.Capability<*>, Any?>

idea/idea-analysis/src/org/jetbrains/kotlin/idea/compiler/IDELanguageSettingsProvider.kt

@@ -33,10 +33,7 @@ import org.jetbrains.kotlin.config.AnalysisFlag
 import org.jetbrains.kotlin.config.KotlinFacetSettingsProvider
 import org.jetbrains.kotlin.config.LanguageVersionSettings
 import org.jetbrains.kotlin.config.TargetPlatformVersion
-import org.jetbrains.kotlin.idea.caches.project.LibraryInfo
-import org.jetbrains.kotlin.idea.caches.project.ModuleSourceInfo
-import org.jetbrains.kotlin.idea.caches.project.ScriptDependenciesInfo
-import org.jetbrains.kotlin.idea.caches.project.ScriptModuleInfo
+import org.jetbrains.kotlin.idea.caches.project.*
 import org.jetbrains.kotlin.idea.project.getLanguageVersionSettings
 import org.jetbrains.kotlin.idea.project.languageVersionSettings
 import org.jetbrains.kotlin.idea.project.targetPlatform
@@ -44,12 +41,12 @@ import org.jetbrains.kotlin.script.KotlinScriptDefinition
 
 object IDELanguageSettingsProvider : LanguageSettingsProvider {
     override fun getLanguageVersionSettings(moduleInfo: ModuleInfo, project: Project): LanguageVersionSettings =
-        when {
-            moduleInfo is ModuleSourceInfo -> moduleInfo.module.languageVersionSettings
-            moduleInfo is LibraryInfo -> project.getLanguageVersionSettings(extraAnalysisFlags = getExtraAnalysisFlags(project))
-            moduleInfo is ScriptModuleInfo -> getVersionLanguageSettingsForScripts(project, moduleInfo.scriptDefinition)
-            moduleInfo is ScriptDependenciesInfo.ForFile ->
-                getVersionLanguageSettingsForScripts(project, moduleInfo.scriptDefinition)
+        when (moduleInfo) {
+            is ModuleSourceInfo -> moduleInfo.module.languageVersionSettings
+            is LibraryInfo -> project.getLanguageVersionSettings(extraAnalysisFlags = getExtraAnalysisFlags(project))
+            is ScriptModuleInfo -> getVersionLanguageSettingsForScripts(project, moduleInfo.scriptDefinition)
+            is ScriptDependenciesInfo.ForFile -> getVersionLanguageSettingsForScripts(project, moduleInfo.scriptDefinition)
+            is PlatformModuleInfo -> moduleInfo.platformModule.module.languageVersionSettings
             else -> project.getLanguageVersionSettings()
         }
 

idea/testData/multiModuleHighlighting/multiplatform/suspend/base_common/common.kt

@@ -0,0 +1,2 @@
+// !CHECK_HIGHLIGHTING
+fun some() {}

idea/testData/multiModuleHighlighting/multiplatform/suspend/base_jvm_dep(coroutines)/jvm.kt

@@ -0,0 +1,5 @@
+suspend fun foo(
+    block: suspend () -> Unit
+) {
+    block()
+}

idea/tests/org/jetbrains/kotlin/idea/caches/resolve/MultiModuleHighlightingTestGenerated.java

@@ -99,6 +99,11 @@ public class MultiModuleHighlightingTestGenerated extends AbstractMultiModuleHig
         runTest("idea/testData/multiModuleHighlighting/multiplatform/suppressHeaderWithoutImpl/");
     }
 
+    @TestMetadata("suspend")
+    public void testSuspend() throws Exception {
+        runTest("idea/testData/multiModuleHighlighting/multiplatform/suspend/");
+    }
+
     @TestMetadata("transitive")
     public void testTransitive() throws Exception {
         runTest("idea/testData/multiModuleHighlighting/multiplatform/transitive/");

idea/tests/org/jetbrains/kotlin/idea/multiplatform/multiPlatformSetup.kt

@@ -54,6 +54,7 @@ fun AbstractMultiModuleTest.setupMppProjectFromDirStructure(testRoot: File) {
                         PluginTestCaseBase.jdk(TestJdkKind.FULL_JDK)
                     })
                 }
+                is CoroutinesDependency -> module.enableCoroutines()
             }
         }
     }
@@ -140,6 +141,7 @@ private fun parseDependency(it: String): Dependency {
     return when {
         dependencyString.equals("stdlib", ignoreCase = true) -> StdlibDependency
         dependencyString.equals("fulljdk", ignoreCase = true) -> FullJdkDependency
+        dependencyString.equals("coroutines", ignoreCase = true) -> CoroutinesDependency
         else -> ModuleDependency(parseModuleId(dependencyString.split("-")))
     }
 }
@@ -187,4 +189,5 @@ private data class RootInfo(
 private sealed class Dependency
 private class ModuleDependency(val moduleId: ModuleId) : Dependency()
 private object StdlibDependency : Dependency()
-private object FullJdkDependency : Dependency()
+private object FullJdkDependency : Dependency()
+private object CoroutinesDependency : Dependency()

idea/tests/org/jetbrains/kotlin/idea/multiplatform/multiPlatformSetup.kt.182

@@ -54,6 +54,7 @@ fun AbstractMultiModuleTest.setupMppProjectFromDirStructure(testRoot: File) {
                         PluginTestCaseBase.jdk(TestJdkKind.FULL_JDK)
                     })
                 }
+                is CoroutinesDependency -> module.enableCoroutines()
             }
         }
     }
@@ -140,6 +141,7 @@ private fun parseDependency(it: String): Dependency {
     return when {
         dependencyString.equals("stdlib", ignoreCase = true) -> StdlibDependency
         dependencyString.equals("fulljdk", ignoreCase = true) -> FullJdkDependency
+        dependencyString.equals("coroutines", ignoreCase = true) -> CoroutinesDependency
         else -> ModuleDependency(parseModuleId(dependencyString.split("-")))
     }
 }
@@ -187,4 +189,5 @@ private data class RootInfo(
 private sealed class Dependency
 private class ModuleDependency(val moduleId: ModuleId) : Dependency()
 private object StdlibDependency : Dependency()
-private object FullJdkDependency : Dependency()
+private object FullJdkDependency : Dependency()
+private object CoroutinesDependency : Dependency()

idea/tests/org/jetbrains/kotlin/idea/stubs/AbstractMultiModuleTest.kt

@@ -24,6 +24,7 @@ import com.intellij.openapi.vfs.newvfs.impl.VfsRootAccess
 import com.intellij.testFramework.PsiTestUtil
 import org.jetbrains.kotlin.config.CompilerSettings
 import org.jetbrains.kotlin.config.KotlinFacetSettingsProvider
+import org.jetbrains.kotlin.config.LanguageFeature
 import org.jetbrains.kotlin.config.TargetPlatformKind
 import org.jetbrains.kotlin.idea.facet.getOrCreateFacet
 import org.jetbrains.kotlin.idea.facet.initializeIfNeeded
@@ -103,6 +104,13 @@ abstract class AbstractMultiModuleTest : DaemonAnalyzerTestCase() {
         }
     }
 
+    fun Module.enableCoroutines() {
+        createFacet()
+        val facetSettings = KotlinFacetSettingsProvider.getInstance(project).getInitializedSettings(this)
+        facetSettings.useProjectSettings = false
+        facetSettings.coroutineSupport = LanguageFeature.State.ENABLED
+    }
+
     protected fun checkFiles(shouldCheckFile: () -> Boolean = { true }, check: () -> Unit) {
         var atLeastOneFile = false
         myProject.allKotlinFiles().forEach { file ->