show local functions in structure view

#KT-13473 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/structureView/KotlinStructureViewElement.kt

@@ -89,6 +89,23 @@ class KotlinStructureViewElement(val element: NavigatablePsiElement,
             is KtFile -> element.declarations
             is KtClass -> element.getPrimaryConstructorParameters().filter { it.hasValOrVar() } + element.declarations
             is KtClassOrObject -> element.declarations
+            is KtFunction -> element.collectLocalDeclarations()
             else -> emptyList()
         }
+
+    private fun KtFunction.collectLocalDeclarations(): List<KtDeclaration> {
+        val result = mutableListOf<KtDeclaration>()
+
+        acceptChildren(object : KtTreeVisitorVoid() {
+            override fun visitClassOrObject(classOrObject: KtClassOrObject) {
+                result.add(classOrObject)
+            }
+
+            override fun visitNamedFunction(function: KtNamedFunction) {
+                result.add(function)
+            }
+        })
+
+        return result
+    }
 }

idea/testData/structureView/fileStructure/LocalElements.after

@@ -0,0 +1,5 @@
+-LocalElements.kt
+ -foo(): Unit
+  bar(): Unit
+  -X
+   xyzzy(): Unit

idea/testData/structureView/fileStructure/LocalElements.kt

@@ -0,0 +1,8 @@
+fun foo() {
+    fun bar() { }
+
+    class X {
+        fun xyzzy() {
+        }
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/structureView/KotlinFileStructureTestGenerated.java

@@ -113,6 +113,12 @@ public class KotlinFileStructureTestGenerated extends AbstractKotlinFileStructur
         doTest(fileName);
     }
 
+    @TestMetadata("LocalElements.kt")
+    public void testLocalElements() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/testData/structureView/fileStructure/LocalElements.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("Render.kt")
     public void testRender() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/testData/structureView/fileStructure/Render.kt");