Re-highlight only single function after local modifications

ChangeLog.md

@@ -103,6 +103,7 @@ These artifacts include extensions for the types available in the latter JDKs, s
 - [`KT-9285`](https://youtrack.jetbrains.com/issue/KT-9285) Rename: Optimize search of private class members
 - [`KT-13589`](https://youtrack.jetbrains.com/issue/KT-13589) Use TODO() consistently in implementation stubs
 - [`KT-13630`](https://youtrack.jetbrains.com/issue/KT-13630) Do not show Change Signature dialog when applying "Remove parameter" quick-fix
+- Re-highlight only single function after local modifications
 
 #### Intention actions, inspections and quickfixes
 

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
+    }
+}

idea/src/META-INF/plugin.xml

@@ -495,6 +495,7 @@
 
     <annotator language="kotlin" implementationClass="org.jetbrains.kotlin.idea.highlighter.KotlinPsiCheckerAndHighlightingUpdater"/>
     <highlightRangeExtension implementation="org.jetbrains.kotlin.idea.highlighter.KotlinPsiChecker"/>
+    <daemon.changeLocalityDetector implementation="org.jetbrains.kotlin.idea.highlighter.KotlinChangeLocalityDetector"/>
 
     <annotator language="kotlin" implementationClass="org.jetbrains.kotlin.idea.highlighter.DebugInfoAnnotator"/>
     <annotator language="kotlin" implementationClass="org.jetbrains.kotlin.idea.highlighter.DuplicateJvmSignatureAnnotator"/>