KT-6122 Code completion in when in enum extension methods suggests non-qualified enum entry names

#KT-6122 Fixed

idea/ide-common/src/org/jetbrains/jet/plugin/codeInsight/ReferenceVariantsHelper.kt

@@ -113,9 +113,8 @@ public class ReferenceVariantsHelper(
 
             // process instance members that can be called via implicit receiver's instances
             val receivers = resolutionScope.getImplicitReceiversWithInstance()
-            receivers.flatMapTo(descriptorsSet) {
+            val fromReceiversFilter = kindFilter.withoutKinds(DescriptorKindFilter.CLASSIFIERS_MASK) exclude DescriptorKindExclude.Extensions
-                it.getType().getMemberScope().getDescriptorsFiltered(kindFilter exclude DescriptorKindExclude.Extensions, nameFilter)
+            receivers.flatMapTo(descriptorsSet) { it.getType().getMemberScope().getDescriptorsFiltered(fromReceiversFilter, nameFilter) }
-            }
 
             val dataFlowInfo = context.getDataFlowInfo(expression)
             val receiverValues = receivers.map { it.getValue() }

idea/testData/completion/basic/common/NoEnumMembersFromImplicitQualifier.kt

@@ -0,0 +1,11 @@
+enum class E {
+    A
+    B
+}
+
+fun E.foo() {
+    <caret>
+}
+
+// ABSENT: A
+// ABSENT: B

idea/testData/completion/basic/common/NoNestedClassesFromImplicitQualifier.kt

@@ -0,0 +1,11 @@
+class Outer {
+    class Nested
+    inner class Inner
+}
+
+fun Outer.foo() {
+    <caret>
+}
+
+// ABSENT: Nested
+// ABSENT: Inner

idea/tests/org/jetbrains/jet/completion/JSBasicCompletionTestGenerated.java

@@ -706,6 +706,12 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
             doTest(fileName);
         }
 
+        @TestMetadata("NoEnumMembersFromImplicitQualifier.kt")
+        public void testNoEnumMembersFromImplicitQualifier() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoEnumMembersFromImplicitQualifier.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("NoExtensionsAfterQualifier.kt")
         public void testNoExtensionsAfterQualifier() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoExtensionsAfterQualifier.kt");
@@ -718,6 +724,12 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
             doTest(fileName);
         }
 
+        @TestMetadata("NoNestedClassesFromImplicitQualifier.kt")
+        public void testNoNestedClassesFromImplicitQualifier() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoNestedClassesFromImplicitQualifier.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("NoPackageFacadeClasses.kt")
         public void testNoPackageFacadeClasses() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoPackageFacadeClasses.kt");

idea/tests/org/jetbrains/jet/completion/JvmBasicCompletionTestGenerated.java

@@ -706,6 +706,12 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
             doTest(fileName);
         }
 
+        @TestMetadata("NoEnumMembersFromImplicitQualifier.kt")
+        public void testNoEnumMembersFromImplicitQualifier() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoEnumMembersFromImplicitQualifier.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("NoExtensionsAfterQualifier.kt")
         public void testNoExtensionsAfterQualifier() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoExtensionsAfterQualifier.kt");
@@ -718,6 +724,12 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
             doTest(fileName);
         }
 
+        @TestMetadata("NoNestedClassesFromImplicitQualifier.kt")
+        public void testNoNestedClassesFromImplicitQualifier() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoNestedClassesFromImplicitQualifier.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("NoPackageFacadeClasses.kt")
         public void testNoPackageFacadeClasses() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/NoPackageFacadeClasses.kt");