KJS: don't overwrite prototype of native classes when inheriting from them

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -3455,6 +3455,12 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("nativeNativeKotlin.kt")
+        public void testNativeNativeKotlin() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/inheritance/nativeNativeKotlin.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("overrideAnyMethods.kt")
         public void testOverrideAnyMethods() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/inheritance/overrideAnyMethods.kt");

js/js.translator/src/org/jetbrains/kotlin/js/translate/context/StaticContext.java

@@ -684,8 +684,9 @@ public final class StaticContext {
     }
 
     private void addClassPrototypes(@NotNull ClassDescriptor cls, @NotNull Set<ClassDescriptor> visited) {
-        if (DescriptorUtilsKt.getModule(cls) != currentModule) return;
         if (!visited.add(cls)) return;
+        if (DescriptorUtilsKt.getModule(cls) != currentModule) return;
+        if (isNativeObject(cls) || isLibraryObject(cls)) return;
 
         ClassDescriptor superclass = DescriptorUtilsKt.getSuperClassNotAny(cls);
         if (superclass != null) {

js/js.translator/testData/box/inheritance/nativeNativeKotlin.kt

@@ -0,0 +1,45 @@
+// FILE: nativeNativeKotlin.kt
+
+package foo
+
+@native
+open class A {
+    fun foo(): String
+}
+
+@native
+open class B : A() {
+    fun bar(): String
+}
+
+class C : B()
+
+fun box(): String {
+    val c = C()
+
+    assertEquals("A.foo", c.foo())
+    assertEquals("B.bar", c.bar())
+
+    return "OK"
+}
+
+// FILE: nativeNativeKotlin.js
+
+function A() {
+
+}
+
+A.prototype.foo = function () {
+    return "A.foo"
+};
+
+function B() {
+
+}
+
+B.prototype = Object.create(A.prototype);
+B.prototype.constructor = B;
+
+B.prototype.bar = function () {
+    return "B.bar"
+};