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

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

@@ -240,8 +240,10 @@ 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()
+                    when (receiver) {
+                        is KtNameReferenceExpression -> {
                             val receiverDescriptor = context[REFERENCE_TARGET, receiver] ?: return null
                             val lambdaValueParameters = context[FUNCTION, lambdaExpression.functionLiteral]?.valueParameters ?: return null
                             if (receiverDescriptor is ParameterDescriptor && receiverDescriptor == lambdaValueParameters.firstOrNull()) {
@@ -258,6 +260,12 @@ class ConvertLambdaToReferenceIntention : SelfTargetingOffsetIndependentIntentio
                                 "${receiverDescriptor.name}::$selectorReferenceName"
                             }
                         }
+                        is KtThisExpression -> {
+                            "${receiver.text}::$selectorReferenceName"
+                        }
+                        else -> null
+                    }
+                }
                 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");