Don't offer to remove empty primary constructor of expect class

idea/src/org/jetbrains/kotlin/idea/intentions/RemoveEmptyPrimaryConstructorIntention.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
+ * Copyright 2010-2017 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,9 +19,14 @@ package org.jetbrains.kotlin.idea.intentions
 import com.intellij.codeInspection.CleanupLocalInspectionTool
 import com.intellij.codeInspection.ProblemHighlightType
 import com.intellij.openapi.editor.Editor
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.idea.inspections.IntentionBasedInspection
+import org.jetbrains.kotlin.idea.search.usagesSearch.descriptor
 import org.jetbrains.kotlin.psi.KtPrimaryConstructor
 import org.jetbrains.kotlin.psi.psiUtil.containingClass
+import org.jetbrains.kotlin.psi.psiUtil.containingClassOrObject
+import org.jetbrains.kotlin.psi.psiUtil.hasExpectModifier
+import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 
 class RemoveEmptyPrimaryConstructorInspection : IntentionBasedInspection<KtPrimaryConstructor>(
         RemoveEmptyPrimaryConstructorIntention::class
@@ -39,6 +44,14 @@ class RemoveEmptyPrimaryConstructorIntention : SelfTargetingOffsetIndependentInt
         element.annotations.isNotEmpty() -> false
         element.modifierList?.text?.isBlank() == false -> false
         element.containingClass()?.secondaryConstructors?.isNotEmpty() == true -> false
+        element.isConstructorOfExpectClass() -> false
         else -> true
     }
+
+    private fun KtPrimaryConstructor.isConstructorOfExpectClass(): Boolean {
+        val containingClass = containingClassOrObject ?: return false
+        if (containingClass.hasExpectModifier()) return true
+
+        return containingClass.descriptor.safeAs<ClassDescriptor>()?.isExpect ?: false
+    }
 }

idea/testData/intentions/removeEmptyPrimaryConstructor/expectClassExplicitConstructor.kt

@@ -0,0 +1,4 @@
+// IS_APPLICABLE: false
+
+@Suppress("UNSUPPORTED_FEATURE")
+expect class Foo constructor()<caret>

idea/testData/intentions/removeEmptyPrimaryConstructor/expectClassPrimaryConstructor.kt

@@ -0,0 +1,4 @@
+// IS_APPLICABLE: false
+
+@Suppress("UNSUPPORTED_FEATURE")
+expect class Foo()<caret>

idea/testData/intentions/removeEmptyPrimaryConstructor/nestedExpectClassPrimaryConstructor.kt

@@ -0,0 +1,6 @@
+// IS_APPLICABLE: false
+
+@Suppress("UNSUPPORTED_FEATURE")
+expect class Foo {
+    class Nested()<caret>
+}

idea/tests/org/jetbrains/kotlin/idea/intentions/IntentionTestGenerated.java

@@ -12779,6 +12779,18 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
             doTest(fileName);
         }
 
+        @TestMetadata("expectClassExplicitConstructor.kt")
+        public void testExpectClassExplicitConstructor() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/removeEmptyPrimaryConstructor/expectClassExplicitConstructor.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("expectClassPrimaryConstructor.kt")
+        public void testExpectClassPrimaryConstructor() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/removeEmptyPrimaryConstructor/expectClassPrimaryConstructor.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("keyword.kt")
         public void testKeyword() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/removeEmptyPrimaryConstructor/keyword.kt");
@@ -12791,6 +12803,12 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
             doTest(fileName);
         }
 
+        @TestMetadata("nestedExpectClassPrimaryConstructor.kt")
+        public void testNestedExpectClassPrimaryConstructor() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/removeEmptyPrimaryConstructor/nestedExpectClassPrimaryConstructor.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("secondary.kt")
         public void testSecondary() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/removeEmptyPrimaryConstructor/secondary.kt");