Don't suggest might be const on actual member declaration

#KT-27822 Fixed

idea/src/org/jetbrains/kotlin/idea/inspections/MayBeConstantInspection.kt

@@ -19,6 +19,7 @@ import org.jetbrains.kotlin.psi.KtObjectDeclaration
 import org.jetbrains.kotlin.psi.KtProperty
 import org.jetbrains.kotlin.psi.propertyVisitor
 import org.jetbrains.kotlin.psi.psiUtil.containingClassOrObject
+import org.jetbrains.kotlin.psi.psiUtil.hasActualModifier
 import org.jetbrains.kotlin.psi.psiUtil.isObjectLiteral
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.constants.ErrorValue
@@ -40,8 +41,7 @@ class MayBeConstantInspection : AbstractKotlinInspection() {
 
     override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean): PsiElementVisitor {
         return propertyVisitor { property ->
-            val status = property.getStatus()
+            when (val status = property.getStatus()) {
-            when (status) {
                 NONE, JVM_FIELD_MIGHT_BE_CONST_NO_INITIALIZER,
                 MIGHT_BE_CONST_ERRONEOUS, JVM_FIELD_MIGHT_BE_CONST_ERRONEOUS -> return@propertyVisitor
                 MIGHT_BE_CONST, JVM_FIELD_MIGHT_BE_CONST -> {
@@ -59,7 +59,7 @@ class MayBeConstantInspection : AbstractKotlinInspection() {
     companion object {
         fun KtProperty.getStatus(): Status {
             if (isLocal || isVar || getter != null ||
-                hasModifier(KtTokens.CONST_KEYWORD) || hasModifier(KtTokens.OVERRIDE_KEYWORD)
+                hasModifier(KtTokens.CONST_KEYWORD) || hasModifier(KtTokens.OVERRIDE_KEYWORD) || hasActualModifier()
             ) {
                 return NONE
             }

idea/src/org/jetbrains/kotlin/idea/quickfix/AddConstModifierFix.kt

@@ -39,6 +39,7 @@ import org.jetbrains.kotlin.psi.KtAnnotationEntry
 import org.jetbrains.kotlin.psi.KtProperty
 import org.jetbrains.kotlin.psi.KtReferenceExpression
 import org.jetbrains.kotlin.psi.psiUtil.getNonStrictParentOfType
+import org.jetbrains.kotlin.psi.psiUtil.hasActualModifier
 import org.jetbrains.kotlin.resolve.checkers.ConstModifierChecker
 import org.jetbrains.kotlin.resolve.source.PsiSourceElement
 
@@ -69,11 +70,15 @@ class AddConstModifierIntention : SelfTargetingIntention<KtProperty>(KtProperty:
 
     companion object {
         fun isApplicableTo(element: KtProperty): Boolean {
-            if (element.isLocal || element.isVar || element.hasDelegate() || element.initializer == null
+            with(element) {
-                || element.getter?.hasBody() == true || element.receiverTypeReference != null
+                if (isLocal || isVar || hasDelegate() || initializer == null
-                || element.hasModifier(KtTokens.CONST_KEYWORD) || element.hasModifier(KtTokens.OVERRIDE_KEYWORD)) {
+                    || getter?.hasBody() == true || receiverTypeReference != null
-                return false
+                    || hasModifier(KtTokens.CONST_KEYWORD) || hasModifier(KtTokens.OVERRIDE_KEYWORD) || hasActualModifier()
+                ) {
+                    return false
+                }
             }
+
             val propertyDescriptor = element.descriptor as? VariableDescriptor ?: return false
             return ConstModifierChecker.canBeConst(element, element, propertyDescriptor)
         }

idea/testData/multiModuleQuickFix/mayBeConstantWithActual/header/header.kt

@@ -0,0 +1 @@
+expect val x: Int

idea/testData/multiModuleQuickFix/mayBeConstantWithActual/jvm/x.kt

@@ -0,0 +1,7 @@
+// "Make 'x' const" "false"
+// ACTION: Add getter
+// ACTION: Convert property initializer to getter
+// ACTION: Convert property to function
+// ACTION: Specify type explicitly
+
+actual val x<caret> = 42

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixMultiModuleTestGenerated.java

@@ -549,6 +549,11 @@ public class QuickFixMultiModuleTestGenerated extends AbstractQuickFixMultiModul
         runTest("idea/testData/multiModuleQuickFix/makeOpenFromExpect/");
     }
 
+    @TestMetadata("mayBeConstantWithActual")
+    public void testMayBeConstantWithActual() throws Exception {
+        runTest("idea/testData/multiModuleQuickFix/mayBeConstantWithActual/");
+    }
+
     @TestMetadata("memberFunParameterToReceiverByHeader")
     public void testMemberFunParameterToReceiverByHeader() throws Exception {
         runTest("idea/testData/multiModuleQuickFix/memberFunParameterToReceiverByHeader/");