allow renaming functions which are members of anonymous objects

#KT-5857 Fixed

idea/src/org/jetbrains/kotlin/idea/refactoring/rename/RenameKotlinFunctionProcessor.kt

@@ -44,8 +44,7 @@ public class RenameKotlinFunctionProcessor : RenameKotlinPsiProcessor() {
     override fun substituteElementToRename(element: PsiElement?, editor: Editor?): PsiElement?  {
         val wrappedMethod = wrapPsiMethod(element)
         if (wrappedMethod == null) {
-            // Cancel rename
-            return null
+            return element
         }
 
         // Use java dialog to ask we should rename function with the base element
@@ -58,7 +57,10 @@ public class RenameKotlinFunctionProcessor : RenameKotlinPsiProcessor() {
     }
 
     override fun prepareRenaming(element: PsiElement?, newName: String?, allRenames: MutableMap<PsiElement, String>, scope: SearchScope) {
-        javaMethodProcessorInstance.prepareRenaming(wrapPsiMethod(element), newName, allRenames, scope)
+        val psiMethod = wrapPsiMethod(element)
+        if (psiMethod?.getContainingClass() != null) {
+            javaMethodProcessorInstance.prepareRenaming(psiMethod, newName, allRenames, scope)
+        }
     }
 
     private fun wrapPsiMethod(element: PsiElement?): PsiMethod? = when (element) {

idea/testData/refactoring/rename/simpleNameReference/localFunction.kt

@@ -0,0 +1,16 @@
+class X {
+    fun fn() : Iterator<String> = object : Iterator<String> {
+        override fun next(): String {
+            dddd()
+            return ""
+        }
+
+        override fun hasNext(): Boolean {
+            return false
+        }
+
+        fun dd<caret>dd() { // try renaming this function
+
+        }
+    }
+}

idea/testData/refactoring/rename/simpleNameReference/localFunction.kt.after

@@ -0,0 +1,16 @@
+class X {
+    fun fn() : Iterator<String> = object : Iterator<String> {
+        override fun next(): String {
+            xyzzy()
+            return ""
+        }
+
+        override fun hasNext(): Boolean {
+            return false
+        }
+
+        fun xyzzy() { // try renaming this function
+
+        }
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/refactoring/rename/SimpleNameReferenceRenameTest.java

@@ -47,6 +47,10 @@ public class SimpleNameReferenceRenameTest extends LightCodeInsightTestCase {
         doTest("anotherRenamed");
     }
 
+    public void testLocalFunction() throws Exception {
+        doTest("xyzzy");
+    }
+
     private void doTest(String newName) throws Exception {
         configureByFile(getTestName(true) + ".kt");
         PsiElement element = TargetElementUtilBase