KT-6923 Completion shouldn't show private symbols from compiled code

#KT-6923 Fixed

idea/src/org/jetbrains/kotlin/idea/completion/CompletionSession.kt

@@ -23,6 +23,7 @@ import com.intellij.patterns.CharPattern
 import com.intellij.patterns.ElementPattern
 import com.intellij.patterns.PatternCondition
 import com.intellij.patterns.StandardPatterns
+import com.intellij.psi.PsiCompiledElement
 import com.intellij.psi.PsiElement
 import com.intellij.psi.search.DelegatingGlobalSearchScope
 import com.intellij.psi.search.GlobalSearchScope
@@ -32,6 +33,7 @@ import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.idea.caches.KotlinIndicesHelper
 import org.jetbrains.kotlin.idea.caches.resolve.ResolutionFacade
 import org.jetbrains.kotlin.idea.caches.resolve.getResolutionFacade
+import org.jetbrains.kotlin.idea.codeInsight.DescriptorToSourceUtilsIde
 import org.jetbrains.kotlin.idea.codeInsight.ReferenceVariantsHelper
 import org.jetbrains.kotlin.idea.completion.smart.SmartCompletion
 import org.jetbrains.kotlin.idea.refactoring.comparePossiblyOverridingDescriptors
@@ -166,10 +168,11 @@ abstract class CompletionSessionBase(protected val configuration: CompletionSess
         get() = KotlinIndicesHelper(project, resolutionFacade, bindingContext!!, searchScope, moduleDescriptor) { isVisibleDescriptor(it) }
 
     protected fun isVisibleDescriptor(descriptor: DeclarationDescriptor): Boolean {
-        if (configuration.completeNonAccessibleDeclarations) return true
-
         if (descriptor is DeclarationDescriptorWithVisibility && inDescriptor != null) {
-            return descriptor.isVisible(inDescriptor, bindingContext, reference?.expression)
+            val visible = descriptor.isVisible(inDescriptor, bindingContext, reference?.expression)
+            if (visible) return true
+            if (!configuration.completeNonAccessibleDeclarations) return false
+            return DescriptorToSourceUtilsIde.getAnyDeclaration(project, descriptor) !is PsiCompiledElement
         }
 
         return true

idea/testData/completion/basic/common/PrivatesInSecondPressCompletion.kt

@@ -0,0 +1,13 @@
+import java.io.File
+
+class MyFile : File("file") {
+    private val privateField = 0
+}
+
+fun foo(f: MyFile) {
+    f.<caret>
+}
+
+// INVOCATION_COUNT: 2
+// EXIST: privateField
+// ABSENT: prefixLength

idea/tests/org/jetbrains/kotlin/completion/JSBasicCompletionTestGenerated.java

@@ -889,6 +889,12 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
             doTest(fileName);
         }
 
+        @TestMetadata("PrivatesInSecondPressCompletion.kt")
+        public void testPrivatesInSecondPressCompletion() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/PrivatesInSecondPressCompletion.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("RecieverMembersFromExtAccessor.kt")
         public void testRecieverMembersFromExtAccessor() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/RecieverMembersFromExtAccessor.kt");

idea/tests/org/jetbrains/kotlin/completion/JvmBasicCompletionTestGenerated.java

@@ -889,6 +889,12 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
             doTest(fileName);
         }
 
+        @TestMetadata("PrivatesInSecondPressCompletion.kt")
+        public void testPrivatesInSecondPressCompletion() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/PrivatesInSecondPressCompletion.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("RecieverMembersFromExtAccessor.kt")
         public void testRecieverMembersFromExtAccessor() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/completion/basic/common/RecieverMembersFromExtAccessor.kt");