KtSimpleNameReference: add root prefix support to bindToFqName function

idea/idea-analysis/src/org/jetbrains/kotlin/idea/references/KtSimpleNameReference.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2015 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.
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.idea.references
@@ -175,7 +164,15 @@ class KtSimpleNameReference(expression: KtSimpleNameExpression) : KtSimpleRefere
         if (expression !is KtNameReferenceExpression) return expression
         if (expression.parent is KtThisExpression || expression.parent is KtSuperExpression) return expression // TODO: it's a bad design of PSI tree, we should change it
 
-        val newExpression = expression.changeQualifiedName(fqName.quoteIfNeeded(), targetElement)
+        val newExpression = expression.changeQualifiedName(
+            fqName.quoteIfNeeded().let {
+                if (shorteningMode == ShorteningMode.NO_SHORTENING)
+                    it
+                else
+                    it.withRootPrefixIfNeeded(expression)
+            },
+            targetElement
+        )
         val newQualifiedElement = newExpression.getQualifiedElementOrCallableRef()
 
         if (shorteningMode == ShorteningMode.NO_SHORTENING) return newExpression