Make implicit this inspection work for lambda invocation #KT-22970 Fixed

idea/src/org/jetbrains/kotlin/idea/inspections/ImplicitThisInspection.kt

@@ -23,6 +23,7 @@ import com.intellij.codeInspection.ProblemsHolder
 import com.intellij.openapi.project.Project
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
+import org.jetbrains.kotlin.idea.intentions.getCallableDescriptor
 import org.jetbrains.kotlin.idea.util.getFactoryForImplicitReceiverWithSubtypeOf
 import org.jetbrains.kotlin.idea.util.getResolutionScope
 import org.jetbrains.kotlin.psi.*
@@ -52,8 +53,10 @@ class ImplicitThisInspection : AbstractKotlinInspection() {
             val context = reference.analyze()
             val scope = reference.getResolutionScope(context) ?: return
 
-            val descriptor = context[BindingContext.REFERENCE_TARGET, reference] as? CallableDescriptor ?: return
+            val descriptor = reference.getCallableDescriptor() ?: return
-            val receiverDescriptor = descriptor.extensionReceiverParameter ?: descriptor.dispatchReceiverParameter ?: return
+            val receiverDescriptor = descriptor.extensionReceiverParameter
+                    ?: descriptor.dispatchReceiverParameter
+                    ?: return
             val receiverType = receiverDescriptor.type
 
             val expressionFactory = scope.getFactoryForImplicitReceiverWithSubtypeOf(receiverType) ?: return

idea/testData/inspectionsLocal/implicitThis/functionWithReceiver.kt

@@ -0,0 +1,3 @@
+fun CharSequence.foo(bar: CharSequence.() -> Unit){
+    <caret>bar()
+}

idea/testData/inspectionsLocal/implicitThis/functionWithReceiver.kt.after

@@ -0,0 +1,3 @@
+fun CharSequence.foo(bar: CharSequence.() -> Unit){
+    <caret>this.bar()
+}

idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java

@@ -1485,6 +1485,12 @@ public class LocalInspectionTestGenerated extends AbstractLocalInspectionTest {
             doTest(fileName);
         }
 
+        @TestMetadata("functionWithReceiver.kt")
+        public void testFunctionWithReceiver() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/inspectionsLocal/implicitThis/functionWithReceiver.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("multipleReceivers.kt")
         public void testMultipleReceivers() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/inspectionsLocal/implicitThis/multipleReceivers.kt");