KT-8389 Meaningless self-import insterted on "optimize imports"

#KT-8389 Fixed

idea/src/org/jetbrains/kotlin/idea/imports/KotlinImportOptimizer.kt

@@ -90,9 +90,14 @@ public class KotlinImportOptimizer() : ImportOptimizer {
             for (descriptor in descriptorsToImport) {
                 val fqName = descriptor.importableFqNameSafe
                 val parentFqName = fqName.parent()
-                if (descriptor is PackageViewDescriptor || parentFqName.isRoot()) {
+                if (descriptor is PackageViewDescriptor) {
                     importsToGenerate.add(ImportPath(fqName, false))
                 }
+                else if (parentFqName.isRoot()) {
+                    if (!currentPackageName.isRoot()) {
+                        importsToGenerate.add(ImportPath(fqName, false))
+                    }
+                }
                 else {
                     descriptorsByPackages.put(parentFqName, descriptor)
                 }

idea/testData/editor/optimizeImports/ClassFromSameFileImportAddedBug.kt

@@ -0,0 +1,8 @@
+import java.io.Serializable
+
+public class Test : Serializable {
+    companion object {
+        val clazz = javaClass<Test>()
+    }
+
+}

idea/testData/editor/optimizeImports/ClassFromSameFileImportAddedBug.kt.after

@@ -0,0 +1,8 @@
+import java.io.Serializable
+
+public class Test : Serializable {
+    companion object {
+        val clazz = javaClass<Test>()
+    }
+
+}

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

@@ -47,6 +47,12 @@ public class OptimizeImportsTestGenerated extends AbstractOptimizeImportsTest {
         doTest(fileName);
     }
 
+    @TestMetadata("ClassFromSameFileImportAddedBug.kt")
+    public void testClassFromSameFileImportAddedBug() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("idea/testData/editor/optimizeImports/ClassFromSameFileImportAddedBug.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("ClassMemberImported.kt")
     public void testClassMemberImported() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("idea/testData/editor/optimizeImports/ClassMemberImported.kt");