Find Usages: Restrict search scope of private top-level declarations

#KT-7622 Fixed

compiler/psi/src/org/jetbrains/kotlin/psi/KtNamedDeclarationStub.java

@@ -18,15 +18,18 @@ package org.jetbrains.kotlin.psi;
 
 import com.google.common.collect.ImmutableSet;
 import com.intellij.lang.ASTNode;
+import com.intellij.openapi.project.Project;
+import com.intellij.psi.JavaPsiFacade;
 import com.intellij.psi.PsiElement;
-import com.intellij.psi.search.LocalSearchScope;
-import com.intellij.psi.search.SearchScope;
+import com.intellij.psi.PsiPackage;
+import com.intellij.psi.search.*;
 import com.intellij.psi.stubs.IStubElementType;
 import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.util.IncorrectOperationException;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.kotlin.idea.KotlinFileType;
 import org.jetbrains.kotlin.lexer.KtTokens;
 import org.jetbrains.kotlin.name.FqName;
 import org.jetbrains.kotlin.name.Name;
@@ -149,6 +152,23 @@ abstract class KtNamedDeclarationStub<T extends KotlinStubWithFqName<?>> extends
             if (containingClass != null) {
                 return new LocalSearchScope(containingClass);
             }
+            KtFile ktFile = getContainingKtFile();
+            if (this instanceof KtClassOrObject) {
+                // Private top-level class may be used in non-Kotlin JVM code
+                Project project = getProject();
+                GlobalSearchScope kotlinFilesScope = GlobalSearchScope.getScopeRestrictedByFileTypes(
+                        GlobalSearchScope.allScope(project),
+                        KotlinFileType.INSTANCE
+                );
+                PsiPackage psiPackage = JavaPsiFacade.getInstance(project).findPackage(ktFile.getPackageFqName().asString());
+                SearchScope baseScope = psiPackage != null
+                                        ? new PackageScope(psiPackage, false, true)
+                                        : super.getUseScope();
+                baseScope.intersectWith(GlobalSearchScope.notScope(kotlinFilesScope));
+            }
+            else {
+                return new LocalSearchScope(ktFile);
+            }
         }
 
         SearchScope scope = super.getUseScope();

idea/testData/refactoring/move/kotlin/moveTopLevelDeclarations/functionAlreadyInaccessible/after/a/noImports.java

@@ -1,9 +1,7 @@
 package a;
 
-import b.TestKt;
-
 class J {
     void bar() {
-        TestKt.test();
+        MainKt.test();
     }
 }

idea/testData/refactoring/move/kotlin/moveTopLevelDeclarations/functionAlreadyInaccessible/after/a/noImports.kt

@@ -1,7 +1,5 @@
 package a
 
-import b.test
-
 fun bar() {
     test()
 }

idea/testData/refactoring/move/kotlin/moveTopLevelDeclarations/movePrivateProperty/conflicts.txt

@@ -1,2 +1 @@
-Getter for property  bar uses property foo which will be inaccessible after move
 Property foo uses property bar which will be inaccessible after move

idea/testData/refactoring/move/kotlin/moveTopLevelDeclarations/propertyAlreadyInaccessible/after/a/noImports.java

@@ -1,10 +1,8 @@
 package a;
 
-import b.TestKt;
-
 class J {
     void bar() {
-        TestKt.setTest("");
-        System.out.println(TestKt.getTest());
+        MainKt.setTest("");
+        System.out.println(MainKt.getTest());
     }
 }

idea/testData/refactoring/move/kotlin/moveTopLevelDeclarations/propertyAlreadyInaccessible/after/a/noImports.kt

@@ -1,7 +1,5 @@
 package a
 
-import b.test
-
 fun bar() {
     test = ""
     println(test)