Re-highlight only single function after local modifications

idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/KotlinChangeLocalityDetector.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2010-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.highlighter
+
+import com.intellij.codeInsight.daemon.ChangeLocalityDetector
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.parents
+
+class KotlinChangeLocalityDetector : ChangeLocalityDetector {
+    override fun getChangeHighlightingDirtyScopeFor(element: PsiElement): PsiElement? {
+        val parent = element.parent
+        if (element is KtBlockExpression && parent is KtNamedFunction && parent.name != null) {
+            // Do nothing for local functions because of at least WRAPPED_INTO_REF highlighting
+
+            if (parent.parents.all { it is KtClassBody || it is KtClassOrObject || it is KtFile || it is KtScript }) {
+                return parent
+            }
+        }
+
+        return null
+    }
+}