Override/Implement: Do not insert super-call into extension body

Such super-calls are not are supported yet

 #KT-4311 Fixed

idea/idea-core/src/org/jetbrains/kotlin/idea/core/overrideImplement/OverrideMemberChooserObject.kt

@@ -102,9 +102,14 @@ interface OverrideMemberChooserObject : ClassMember {
 fun OverrideMemberChooserObject.generateMember(targetClass: KtClassOrObject, copyDoc: Boolean): KtCallableDeclaration {
     val project = targetClass.project
 
-    val bodyType = if (targetClass.hasExpectModifier()) OverrideMemberChooserObject.BodyType.NO_BODY else bodyType
-
     val descriptor = immediateSuper
+
+    val bodyType = when {
+        targetClass.hasExpectModifier() -> OverrideMemberChooserObject.BodyType.NO_BODY
+        descriptor.extensionReceiverParameter != null -> OverrideMemberChooserObject.BodyType.EMPTY
+        else -> bodyType
+    }
+
     if (preferConstructorParameter && descriptor is PropertyDescriptor) return generateConstructorParameter(project, descriptor)
 
     val newMember: KtCallableDeclaration = when (descriptor) {

idea/testData/codeInsight/overrideImplement/overrideExtensionFunction.kt

@@ -0,0 +1,9 @@
+open class A {
+    open fun Int.foo(): Int {
+        return 0
+    }
+}
+
+class B: A() {
+    <caret>
+}

idea/testData/codeInsight/overrideImplement/overrideExtensionFunction.kt.after

@@ -0,0 +1,11 @@
+open class A {
+    open fun Int.foo(): Int {
+        return 0
+    }
+}
+
+class B: A() {
+    override fun Int.foo(): Int {
+        <selection><caret>TODO("not implemented") //To change body of created functions use File | Settings | File Templates.</selection>
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/codeInsight/OverrideImplementTest.kt

@@ -121,6 +121,10 @@ class OverrideImplementTest : AbstractOverrideImplementTest() {
         doOverrideFileTest()
     }
 
+    fun testOverrideExtensionFunction() {
+        doOverrideFileTest()
+    }
+
     fun testOverrideExtensionProperty() {
         doOverrideFileTest()
     }