KT-14680 import statement to typealias reported as unused when using only TA constructor

#KT-14680 fixed

idea/ide-common/src/org/jetbrains/kotlin/idea/util/ImportsUtils.kt

@@ -66,13 +66,14 @@ fun DeclarationDescriptor.canBeReferencedViaImport(): Boolean {
         return !name.isSpecial
     }
 
-    val parentClass = containingDeclaration as? ClassDescriptor ?: return false
-    if (!parentClass.canBeReferencedViaImport()) return false
+    //Both TypeAliasDescriptor and ClassDescriptor
+    val parentClassifier = containingDeclaration as? ClassifierDescriptorWithTypeParameters ?: return false
+    if (!parentClassifier.canBeReferencedViaImport()) return false
 
     return when (this) {
-        is ConstructorDescriptor -> !parentClass.isInner // inner class constructors can't be referenced via import
-        is ClassDescriptor -> true
-        else -> parentClass.kind == ClassKind.OBJECT
+        is ConstructorDescriptor -> !parentClassifier.isInner // inner class constructors can't be referenced via import
+        is ClassDescriptor, is TypeAliasDescriptor -> true
+        else -> parentClassifier is ClassDescriptor && parentClassifier.kind == ClassKind.OBJECT
     }
 }
 

idea/testData/editor/optimizeImports/jvm/KT13766.kt

@@ -1,22 +0,0 @@
-import java.util.*
-
-class Outer {
-
-    private abstract class Base {
-
-        protected sealed class Sealed {
-            object OOO : Sealed()
-        }
-
-        typealias OOO = Sealed.OOO
-    }
-
-    private class Derived : Base() {
-
-        fun foo(): Sealed {
-            ArrayList<Int>()
-            return OOO
-        }
-
-    }
-}

idea/testData/editor/optimizeImports/jvm/KT13766.kt.after

@@ -1,22 +0,0 @@
-import java.util.ArrayList
-
-class Outer {
-
-    private abstract class Base {
-
-        protected sealed class Sealed {
-            object OOO : Sealed()
-        }
-
-        typealias OOO = Sealed.OOO
-    }
-
-    private class Derived : Base() {
-
-        fun foo(): Sealed {
-            ArrayList<Int>()
-            return OOO
-        }
-
-    }
-}

idea/testData/inspections/unusedImport/noUnusedImportsForTypeAliasesUsages.Dependency.kt

@@ -0,0 +1,7 @@
+package p1
+
+class Some
+typealias SomeAlias = Some
+
+annotation class Ann
+typealias AnnAlias = Ann

idea/testData/inspections/unusedImport/noUnusedImportsForTypeAliasesUsages.kt

@@ -0,0 +1,5 @@
+import p1.SomeAlias
+import p1.AnnAlias
+
+@AnnAlias
+val some = SomeAlias()

idea/testData/quickfix/optimizeImports/notRemoveImportsForTypeAliases.before.Dependency.kt

@@ -0,0 +1,7 @@
+package p1
+
+class Some
+typealias SomeAlias = Some
+
+annotation class Ann
+typealias AnnAlias = Ann

idea/testData/quickfix/optimizeImports/notRemoveImportsForTypeAliases.before.Main.kt

@@ -0,0 +1,7 @@
+// "Optimize imports" "false"
+
+import p1.SomeAlias<caret>
+import p1.AnnAlias
+
+@AnnAlias
+val some = SomeAlias()

idea/tests/org/jetbrains/kotlin/idea/imports/JvmOptimizeImportsTestGenerated.java

@@ -104,12 +104,6 @@ public class JvmOptimizeImportsTestGenerated extends AbstractJvmOptimizeImportsT
             doTest(fileName);
         }
 
-        @TestMetadata("KT13766.kt")
-        public void testKT13766() throws Exception {
-            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/editor/optimizeImports/jvm/KT13766.kt");
-            doTest(fileName);
-        }
-
         @TestMetadata("Kt1850FullQualified.kt")
         public void testKt1850FullQualified() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/editor/optimizeImports/jvm/Kt1850FullQualified.kt");

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

@@ -1801,6 +1801,21 @@ public class QuickFixMultiFileTestGenerated extends AbstractQuickFixMultiFileTes
 
     }
 
+    @TestMetadata("idea/testData/quickfix/optimizeImports")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class OptimizeImports extends AbstractQuickFixMultiFileTest {
+        public void testAllFilesPresentInOptimizeImports() throws Exception {
+            KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/quickfix/optimizeImports"), Pattern.compile("^(\\w+)\\.((before\\.Main\\.\\w+)|(test))$"), TargetBackend.ANY, true);
+        }
+
+        @TestMetadata("notRemoveImportsForTypeAliases.before.Main.kt")
+        public void testNotRemoveImportsForTypeAliases() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/quickfix/optimizeImports/notRemoveImportsForTypeAliases.before.Main.kt");
+            doTestWithExtraFile(fileName);
+        }
+    }
+
     @TestMetadata("idea/testData/quickfix/override")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)