Create from Usage: Do not add bodies to expect class members

#KT-21122 Fixed

idea/src/org/jetbrains/kotlin/idea/quickfix/createFromUsage/callableBuilder/CallableBuilder.kt

@@ -463,6 +463,10 @@ class CallableBuilder(val config: CallableBuilderConfiguration) {
                         else if (isExtension) "private "
                         else ""
 
+                val isExpectClassMember by lazy {
+                    containingElement is KtClassOrObject && (containingElement.resolveToDescriptorIfAny() as? ClassDescriptor)?.isExpect ?: false
+                }
+
                 val declaration: KtNamedDeclaration = when (callableInfo.kind) {
                     CallableKind.FUNCTION, CallableKind.SECONDARY_CONSTRUCTOR -> {
                         val body = when {
@@ -473,6 +477,7 @@ class CallableBuilder(val config: CallableBuilderConfiguration) {
                             containingElement is KtObjectDeclaration && containingElement.isCompanion()
                                 && containingElement.parent.parent is KtClass
                                 && (containingElement.parent.parent as KtClass).hasModifier(KtTokens.EXTERNAL_KEYWORD) -> ""
+                            isExpectClassMember -> ""
                             else -> "{}"
 
                         }
@@ -517,7 +522,7 @@ class CallableBuilder(val config: CallableBuilderConfiguration) {
                     CallableKind.PROPERTY -> {
                         val isVar = (callableInfo as PropertyInfo).writable
                         val valVar = if (isVar) "var" else "val"
-                        val accessors = if (isExtension) {
+                        val accessors = if (isExtension && !isExpectClassMember) {
                             buildString {
                                 append("\nget() {}")
                                 if (isVar) {

idea/testData/multiModuleQuickFix/createFunInExpectClass/header/header.kt

@@ -0,0 +1,8 @@
+// "Create member function 'Foo.foo'" "true"
+// ERROR: Unresolved reference: foo
+
+expect class Foo
+
+fun test(f: Foo) {
+    f.<caret>foo("a", 1)
+}

idea/testData/multiModuleQuickFix/createFunInExpectClass/header/header.kt.after

@@ -0,0 +1,10 @@
+// "Create member function 'Foo.foo'" "true"
+// ERROR: Unresolved reference: foo
+
+expect class Foo {
+    fun foo(s: String, i: Int)
+}
+
+fun test(f: Foo) {
+    f.foo("a", 1)
+}

idea/testData/multiModuleQuickFix/createFunInExpectClass/jvm/impl.kt

@@ -0,0 +1 @@
+actual class Foo

idea/testData/multiModuleQuickFix/createFunInExpectClass/jvm/impl.kt.after

@@ -0,0 +1 @@
+actual class Foo

idea/testData/multiModuleQuickFix/createValInExpectClass/header/header.kt

@@ -0,0 +1,12 @@
+// "Create member property 'Foo.foo'" "true"
+// ERROR: Unresolved reference: foo
+
+expect class Foo
+
+fun test(f: Foo) {
+    takeInt(f.<caret>foo)
+}
+
+fun takeInt(n: Int) {
+
+}

idea/testData/multiModuleQuickFix/createValInExpectClass/header/header.kt.after

@@ -0,0 +1,14 @@
+// "Create member property 'Foo.foo'" "true"
+// ERROR: Unresolved reference: foo
+
+expect class Foo {
+    val foo: Int
+}
+
+fun test(f: Foo) {
+    takeInt(f.foo)
+}
+
+fun takeInt(n: Int) {
+
+}

idea/testData/multiModuleQuickFix/createValInExpectClass/jvm/impl.kt

@@ -0,0 +1 @@
+actual class Foo

idea/testData/multiModuleQuickFix/createValInExpectClass/jvm/impl.kt.after

@@ -0,0 +1 @@
+actual class Foo

idea/testData/multiModuleQuickFix/createVarInExpectClass/header/header.kt

@@ -0,0 +1,8 @@
+// "Create member property 'Foo.foo'" "true"
+// ERROR: Unresolved reference: foo
+
+expect class Foo
+
+fun test(f: Foo) {
+    f.<caret>foo = 1
+}

idea/testData/multiModuleQuickFix/createVarInExpectClass/header/header.kt.after

@@ -0,0 +1,10 @@
+// "Create member property 'Foo.foo'" "true"
+// ERROR: Unresolved reference: foo
+
+expect class Foo {
+    var foo: Int
+}
+
+fun test(f: Foo) {
+    f.foo = 1
+}

idea/testData/multiModuleQuickFix/createVarInExpectClass/jvm/impl.kt

@@ -0,0 +1 @@
+actual class Foo

idea/testData/multiModuleQuickFix/createVarInExpectClass/jvm/impl.kt.after

@@ -0,0 +1 @@
+actual class Foo

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixMultiModuleTest.kt

@@ -249,4 +249,13 @@ class QuickFixMultiModuleTest : AbstractQuickFixMultiModuleTest() {
 
     @Test
     fun testAddActualToTopLevelMember() = doMultiPlatformTest()
+
+    @Test
+    fun testCreateFunInExpectClass() = doMultiPlatformTest()
+
+    @Test
+    fun testCreateValInExpectClass() = doMultiPlatformTest()
+
+    @Test
+    fun testCreateVarInExpectClass() = doMultiPlatformTest()
 }