KT-13111: lambda --> reference support methods called via this now

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

@@ -240,22 +240,30 @@ class ConvertLambdaToReferenceIntention : SelfTargetingOffsetIndependentIntentio
                         is KtNameReferenceExpression -> selector.getReferencedName()
                         else -> return null
                     }
-                    val receiver = singleStatement.receiverExpression as? KtNameReferenceExpression ?: return null
+                    val receiver = singleStatement.receiverExpression
                     val context = receiver.analyze()
-                    val receiverDescriptor = context[REFERENCE_TARGET, receiver] ?: return null
+                    when (receiver) {
-                    val lambdaValueParameters = context[FUNCTION, lambdaExpression.functionLiteral]?.valueParameters ?: return null
+                        is KtNameReferenceExpression -> {
-                    if (receiverDescriptor is ParameterDescriptor && receiverDescriptor == lambdaValueParameters.firstOrNull()) {
+                            val receiverDescriptor = context[REFERENCE_TARGET, receiver] ?: return null
-                        val originalReceiverType = receiverDescriptor.type
+                            val lambdaValueParameters = context[FUNCTION, lambdaExpression.functionLiteral]?.valueParameters ?: return null
-                        val receiverType = originalReceiverType.approximateFlexibleTypes(preferNotNull = true)
+                            if (receiverDescriptor is ParameterDescriptor && receiverDescriptor == lambdaValueParameters.firstOrNull()) {
-                        if (shortTypes) {
+                                val originalReceiverType = receiverDescriptor.type
-                            "${IdeDescriptorRenderers.SOURCE_CODE_SHORT_NAMES_IN_TYPES.renderType(receiverType)}::$selectorReferenceName"
+                                val receiverType = originalReceiverType.approximateFlexibleTypes(preferNotNull = true)
+                                if (shortTypes) {
+                                    "${IdeDescriptorRenderers.SOURCE_CODE_SHORT_NAMES_IN_TYPES.renderType(receiverType)}::$selectorReferenceName"
+                                }
+                                else {
+                                    "${IdeDescriptorRenderers.SOURCE_CODE.renderType(receiverType)}::$selectorReferenceName"
+                                }
+                            }
+                            else {
+                                "${receiverDescriptor.name}::$selectorReferenceName"
+                            }
                         }
-                        else {
+                        is KtThisExpression -> {
-                            "${IdeDescriptorRenderers.SOURCE_CODE.renderType(receiverType)}::$selectorReferenceName"
+                            "${receiver.text}::$selectorReferenceName"
                         }
-                    }
+                        else -> null
-                    else {
-                        "${receiverDescriptor.name}::$selectorReferenceName"
                     }
                 }
                 else -> null

idea/testData/intentions/convertLambdaToReference/memberViaThis.kt

@@ -0,0 +1,4 @@
+class Owner(val z: Int) {
+    fun foo(y: Int) = y + z
+    val x = { y: Int -><caret> this.foo(y) }
+}

idea/testData/intentions/convertLambdaToReference/memberViaThis.kt.after

@@ -0,0 +1,4 @@
+class Owner(val z: Int) {
+    fun foo(y: Int) = y + z
+    val x = this::foo
+}

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

@@ -4466,6 +4466,12 @@ public class IntentionTestGenerated extends AbstractIntentionTest {
             doTest(fileName);
         }
 
+        @TestMetadata("memberViaThis.kt")
+        public void testMemberViaThis() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/convertLambdaToReference/memberViaThis.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("name.kt")
         public void testName() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/intentions/convertLambdaToReference/name.kt");