show icon of class initializer

#KT-11775 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/KotlinIconProvider.kt

@@ -23,8 +23,8 @@ import com.intellij.openapi.util.text.StringUtil
 import com.intellij.psi.PsiElement
 import com.intellij.ui.RowIcon
 import com.intellij.util.PlatformIcons
-import org.jetbrains.kotlin.asJava.classes.KtLightClassForSourceDeclaration
 import org.jetbrains.kotlin.asJava.classes.KtLightClassForFacade
+import org.jetbrains.kotlin.asJava.classes.KtLightClassForSourceDeclaration
 import org.jetbrains.kotlin.idea.caches.resolve.KtLightClassForDecompiledDeclaration
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.*
@@ -40,7 +40,7 @@ class KotlinIconProvider : IconProvider(), DumbAware {
         }
 
         val result = psiElement.getBaseIcon()
-        if (flags and Iconable.ICON_FLAG_VISIBILITY > 0 && result != null && psiElement is KtModifierListOwner) {
+        if (flags and Iconable.ICON_FLAG_VISIBILITY > 0 && result != null && (psiElement is KtModifierListOwner && psiElement !is KtClassInitializer)) {
             val list = psiElement.modifierList
             return createRowIcon(result, getVisibilityIcon(list))
         }
@@ -114,6 +114,7 @@ class KotlinIconProvider : IconProvider(), DumbAware {
                     KotlinIcons.PARAMETER
             }
             is KtProperty -> if (isVar) KotlinIcons.FIELD_VAR else KotlinIcons.FIELD_VAL
+            is KtClassInitializer -> KotlinIcons.CLASS_INITIALIZER
             else -> null
         }
     }

idea/idea-analysis/src/org/jetbrains/kotlin/idea/KotlinIcons.java

@@ -42,6 +42,7 @@ public interface KotlinIcons {
     Icon PARAMETER = PlatformIcons.PARAMETER_ICON;
     Icon FIELD_VAL = IconLoader.getIcon("/org/jetbrains/kotlin/idea/icons/field_value.png");
     Icon FIELD_VAR = IconLoader.getIcon("/org/jetbrains/kotlin/idea/icons/field_variable.png");
+    Icon CLASS_INITIALIZER = IconLoader.getIcon("/org/jetbrains/kotlin/idea/icons/classInitializerKotlin.png");
 
     Icon LAUNCH = IconLoader.getIcon("/org/jetbrains/kotlin/idea/icons/kotlin_launch_configuration.png");
 }

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

@@ -22,6 +22,7 @@ import com.intellij.navigation.ItemPresentation
 import com.intellij.openapi.project.DumbService
 import com.intellij.openapi.ui.Queryable
 import com.intellij.psi.NavigatablePsiElement
+import com.intellij.psi.PsiElement
 import org.jetbrains.annotations.TestOnly
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.resolveToDescriptor
@@ -89,11 +90,11 @@ 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()
+            is KtFunction, is KtClassInitializer -> element.collectLocalDeclarations()
             else -> emptyList()
         }
 
-    private fun KtFunction.collectLocalDeclarations(): List<KtDeclaration> {
+    private fun PsiElement.collectLocalDeclarations(): List<KtDeclaration> {
         val result = mutableListOf<KtDeclaration>()
 
         acceptChildren(object : KtTreeVisitorVoid() {

idea/testData/structureView/fileStructure/LocalElements.after

@@ -2,4 +2,6 @@
  -foo(): Unit
   bar(): Unit
   -X
+   -<class initializer>
+    quux(): Unit
    xyzzy(): Unit

idea/testData/structureView/fileStructure/LocalElements.kt

@@ -2,6 +2,11 @@ fun foo() {
     fun bar() { }
 
     class X {
+        init {
+            fun quux() {
+            }
+        }
+
         fun xyzzy() {
         }
     }