Rename: Use qualified class name when looking for occurrences in non-code files

#KT-14128 Fixed
 #KT-13862 Fixed
 #KT-6199 Fixed

idea/src/META-INF/plugin.xml

@@ -546,7 +546,11 @@
 
     <gotoTargetRendererProvider id="JetGotoTargetRenderProvider" implementation="org.jetbrains.kotlin.idea.KotlinGotoTargetRenderProvider"
                                 order="first"/>
-    <elementDescriptionProvider implementation="org.jetbrains.kotlin.idea.findUsages.KotlinElementDescriptionProvider" order="first"/>
+    <elementDescriptionProvider
+        implementation="org.jetbrains.kotlin.idea.findUsages.KotlinElementDescriptionProvider"
+        order="first"/>
+    <elementDescriptionProvider
+        implementation="org.jetbrains.kotlin.idea.findUsages.KotlinNonCodeSearchElementDescriptionProvider"/>
     <highlightUsagesHandlerFactory implementation="org.jetbrains.kotlin.idea.highlighter.KotlinHighlightExitPointsHandlerFactory"/>
     <findUsagesHandlerFactory implementation="org.jetbrains.kotlin.idea.findUsages.KotlinFindUsagesHandlerFactory"/>
     <usageTypeProvider implementation="org.jetbrains.kotlin.idea.findUsages.KotlinUsageTypeProvider"/>

idea/src/org/jetbrains/kotlin/idea/findUsages/KotlinNonCodeSearchElementDescriptionProvider.kt

@@ -0,0 +1,32 @@
+/*
+ * 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.findUsages
+
+import com.intellij.psi.ElementDescriptionLocation
+import com.intellij.psi.ElementDescriptionProvider
+import com.intellij.psi.PsiElement
+import com.intellij.refactoring.util.NonCodeSearchDescriptionLocation
+import org.jetbrains.kotlin.asJava.namedUnwrappedElement
+import org.jetbrains.kotlin.psi.KtClassOrObject
+
+class KotlinNonCodeSearchElementDescriptionProvider : ElementDescriptionProvider {
+    override fun getElementDescription(element: PsiElement, location: ElementDescriptionLocation): String? {
+        if (location !is NonCodeSearchDescriptionLocation) return null
+        val declaration = element.namedUnwrappedElement as? KtClassOrObject ?: return null
+        return if (location.isNonJava) (declaration.fqName?.asString() ?: declaration.name) else declaration.name
+    }
+}

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

@@ -17,15 +17,17 @@
 package org.jetbrains.kotlin.idea.refactoring.rename
 
 import com.intellij.openapi.editor.Editor
+import com.intellij.psi.PsiClass
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiReference
+import com.intellij.psi.util.PsiUtilCore
 import com.intellij.refactoring.JavaRefactoringSettings
 import com.intellij.refactoring.listeners.RefactoringElementListener
 import com.intellij.refactoring.rename.RenamePsiElementProcessor
 import com.intellij.usageView.UsageInfo
 import org.jetbrains.kotlin.asJava.classes.KtLightClass
-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.asJava.namedUnwrappedElement
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
@@ -77,6 +79,17 @@ class RenameKotlinClassProcessor : RenameKotlinPsiProcessor() {
         }
     }
 
+    override fun getQualifiedNameAfterRename(element: PsiElement, newName: String?, nonJava: Boolean): String? {
+        if (!nonJava) return newName
+
+        val qualifiedName = when (element) {
+            is KtClassOrObject -> element.fqName?.asString() ?: element.name
+            is PsiClass -> element.qualifiedName ?: element.name
+            else -> return null
+        }
+        return PsiUtilCore.getQualifiedNameAfterRename(qualifiedName, newName)
+    }
+
     override fun findReferences(element: PsiElement): Collection<PsiReference> {
         if (element is KtObjectDeclaration && element.isCompanion()) {
             return super.findReferences(element).filter { !it.isCompanionObjectClassReference() }