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

idea/testData/copyPaste/imports/ClassResolvedToPackage.expected.kt

@@ -1,14 +1,8 @@
-// ERROR: Unresolved reference: a
-// ERROR: Unresolved reference: a
-// ERROR: Unresolved reference: a
 package to
 
 import a.a
 
-fun f(i: a.a) {
-    // TODO References shortening doesn't work for package vs class conflicts under the new resolution rules.
-    // After importing 'a.a', expression 'a.a' is unresolved (since 'a' becomes a class).
-    // 'package' in expression syntax might be required to fix it properly.
-    a.a
-    a.a()
+fun f(i: a) {
+    a
+    a()
 }

idea/testData/copyPaste/imports/ClassResolvedToPackage.kt

@@ -6,9 +6,6 @@ class a {
 }
 
 <selection>fun f(i: a) {
-    // TODO References shortening doesn't work for package vs class conflicts under the new resolution rules.
-    // After importing 'a.a', expression 'a.a' is unresolved (since 'a' becomes a class).
-    // 'package' in expression syntax might be required to fix it properly.
     a
     a()
 }</selection>

idea/testData/quickfix/autoImports/conflictWithClassIdentifier.kt

@@ -0,0 +1,7 @@
+// "Import" "true"
+// DISABLE-ERRORS
+class java
+
+fun test() {
+    Arrays<caret>
+}

idea/testData/quickfix/autoImports/conflictWithClassIdentifier.kt.after

@@ -0,0 +1,9 @@
+import java.util.Arrays
+
+// "Import" "true"
+// DISABLE-ERRORS
+class java
+
+fun test() {
+    Arrays<caret>
+}

idea/testData/quickfix/autoImports/conflictWithLocalIdentifier.kt

@@ -0,0 +1,7 @@
+// "Import" "true"
+// DISABLE-ERRORS
+
+fun test() {
+    val java = 42
+    Arrays<caret>
+}

idea/testData/quickfix/autoImports/conflictWithLocalIdentifier.kt.after

@@ -0,0 +1,9 @@
+import java.util.Arrays
+
+// "Import" "true"
+// DISABLE-ERRORS
+
+fun test() {
+    val java = 42
+    Arrays<caret>
+}

idea/testData/shortenRefs/type/ClassSameNameAsPackage.kt.after

@@ -1,5 +1,4 @@
 import same.same
 
-// todo must be: s: same
-fun f(s: same.same) {
+fun f(s: same) {
 }

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixTestGenerated.java

@@ -1738,6 +1738,16 @@ public class QuickFixTestGenerated extends AbstractQuickFixTest {
             runTest("idea/testData/quickfix/autoImports/checkNoStackOverflowInImportInnerClassInCurrentFile.kt");
         }
 
+        @TestMetadata("conflictWithClassIdentifier.kt")
+        public void testConflictWithClassIdentifier() throws Exception {
+            runTest("idea/testData/quickfix/autoImports/conflictWithClassIdentifier.kt");
+        }
+
+        @TestMetadata("conflictWithLocalIdentifier.kt")
+        public void testConflictWithLocalIdentifier() throws Exception {
+            runTest("idea/testData/quickfix/autoImports/conflictWithLocalIdentifier.kt");
+        }
+
         @TestMetadata("enumEntries.kt")
         public void testEnumEntries() throws Exception {
             runTest("idea/testData/quickfix/autoImports/enumEntries.kt");