Fixed nested class in companion object case

idea/idea-core/src/org/jetbrains/kotlin/idea/core/ShortenReferences.kt

@@ -548,9 +548,10 @@ class ShortenReferences(val options: (KtElement) -> Options = { Options.DEFAULT
             when (targetDescriptor) {
                 is ClassDescriptor -> {
                     if (targetDescriptor.kind != ClassKind.OBJECT) return true
-                    // for object receiver we should additionally check that it's dispatch receiver (that is the member is inside the object)
+                    // for object receiver we should additionally check that it's dispatch receiver (that is the member is inside the object) or not a receiver at all
                     val resolvedCall = element.getResolvedCall(bindingContext) ?: return false
-                    return resolvedCall.explicitReceiverKind == ExplicitReceiverKind.DISPATCH_RECEIVER
+                    val receiverKind = resolvedCall.explicitReceiverKind
+                    return receiverKind == ExplicitReceiverKind.DISPATCH_RECEIVER || receiverKind == ExplicitReceiverKind.NO_EXPLICIT_RECEIVER
                 }
 
                 is PackageViewDescriptor -> return true

idea/testData/shortenRefs/classInCompanionObject.dependency.kt

@@ -0,0 +1,7 @@
+package dependency
+
+class C {
+    companion object {
+        class Nested
+    }
+}

idea/testData/shortenRefs/classInCompanionObject.kt

@@ -0,0 +1,5 @@
+import dependency.C.Companion.Nested
+
+fun foo() {
+    <selection>dependency.C.Companion.Nested()</selection>
+}

idea/testData/shortenRefs/classInCompanionObject.kt.after

@@ -0,0 +1,5 @@
+import dependency.C.Companion.Nested
+
+fun foo() {
+    Nested()
+}

idea/tests/org/jetbrains/kotlin/shortenRefs/ShortenRefsTestGenerated.java

@@ -39,6 +39,12 @@ public class ShortenRefsTestGenerated extends AbstractShortenRefsTest {
         runTest("idea/testData/shortenRefs/callableRefsOnCompanion.kt");
     }
 
+    @TestMetadata("classInCompanionObject.kt")
+    public void testClassInCompanionObject() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/testData/shortenRefs/classInCompanionObject.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("ClassNameConflict.kt")
     public void testClassNameConflict() throws Exception {
         runTest("idea/testData/shortenRefs/ClassNameConflict.kt");