Add PRIVATE_TO_THIS visibility to KtSymbolWithVisibility

This visibility is used for some cases where it isn't allowed to access
to private members of the object from other instances of the same object
because of the type parameter variance.

For almost all clients this visibility is the same as PRIVATE

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/symbols/markers/KtSymbolWithVisibility.kt

@@ -12,8 +12,12 @@ interface KtSymbolWithVisibility {
 sealed class KtSymbolVisibility {
     object PUBLIC : KtSymbolVisibility()
     object PRIVATE : KtSymbolVisibility()
+    object PRIVATE_TO_THIS : KtSymbolVisibility()
     object PROTECTED : KtSymbolVisibility()
     object INTERNAL : KtSymbolVisibility()
     object UNKNOWN : KtSymbolVisibility()
     object LOCAL : KtSymbolVisibility()
-}
+}
+
+fun KtSymbolVisibility.isPrivateOrPrivateToThis(): Boolean =
+    this == KtSymbolVisibility.PRIVATE || this == KtSymbolVisibility.PRIVATE_TO_THIS

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/classes/FirLightAnnotationClassSymbol.kt

@@ -17,7 +17,7 @@ import org.jetbrains.kotlin.idea.frontend.api.symbols.KtClassKind
 import org.jetbrains.kotlin.idea.frontend.api.symbols.KtClassOrObjectSymbol
 import org.jetbrains.kotlin.idea.frontend.api.symbols.KtConstructorSymbol
 import org.jetbrains.kotlin.idea.frontend.api.symbols.KtFunctionSymbol
-import org.jetbrains.kotlin.idea.frontend.api.symbols.markers.KtSymbolVisibility
+import org.jetbrains.kotlin.idea.frontend.api.symbols.markers.isPrivateOrPrivateToThis
 
 internal class FirLightAnnotationClassSymbol(
     private val classOrObjectSymbol: KtClassOrObjectSymbol,
@@ -44,7 +44,7 @@ internal class FirLightAnnotationClassSymbol(
 
         analyzeWithSymbolAsContext(classOrObjectSymbol) {
             val visibleDeclarations = classOrObjectSymbol.getDeclaredMemberScope().getCallableSymbols()
-                .filterNot { it is KtFunctionSymbol && it.visibility == KtSymbolVisibility.PRIVATE }
+                .filterNot { it is KtFunctionSymbol && it.visibility.isPrivateOrPrivateToThis() }
                 .filterNot { it is KtConstructorSymbol }
 
             createMethods(visibleDeclarations, result)

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/classes/FirLightInterfaceClassSymbol.kt

@@ -16,7 +16,7 @@ import org.jetbrains.kotlin.idea.frontend.api.fir.analyzeWithSymbolAsContext
 import org.jetbrains.kotlin.idea.frontend.api.symbols.KtClassKind
 import org.jetbrains.kotlin.idea.frontend.api.symbols.KtClassOrObjectSymbol
 import org.jetbrains.kotlin.idea.frontend.api.symbols.KtFunctionSymbol
-import org.jetbrains.kotlin.idea.frontend.api.symbols.markers.KtSymbolVisibility
+import org.jetbrains.kotlin.idea.frontend.api.symbols.markers.isPrivateOrPrivateToThis
 
 internal class FirLightInterfaceClassSymbol(
     private val classOrObjectSymbol: KtClassOrObjectSymbol,
@@ -41,7 +41,7 @@ internal class FirLightInterfaceClassSymbol(
 
         analyzeWithSymbolAsContext(classOrObjectSymbol) {
             val visibleDeclarations = classOrObjectSymbol.getDeclaredMemberScope().getCallableSymbols()
-                .filterNot { it is KtFunctionSymbol && it.visibility == KtSymbolVisibility.PRIVATE }
+                .filterNot { it is KtFunctionSymbol && it.visibility.isPrivateOrPrivateToThis() }
 
             createMethods(visibleDeclarations, result)
         }

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/classes/firLightClassUtils.kt

@@ -24,10 +24,7 @@ import org.jetbrains.kotlin.idea.frontend.api.analyze
 import org.jetbrains.kotlin.idea.frontend.api.fir.analyzeWithSymbolAsContext
 import org.jetbrains.kotlin.idea.frontend.api.hackyAllowRunningOnEdt
 import org.jetbrains.kotlin.idea.frontend.api.symbols.*
-import org.jetbrains.kotlin.idea.frontend.api.symbols.markers.KtCommonSymbolModality
+import org.jetbrains.kotlin.idea.frontend.api.symbols.markers.*
-import org.jetbrains.kotlin.idea.frontend.api.symbols.markers.KtSymbolVisibility
-import org.jetbrains.kotlin.idea.frontend.api.symbols.markers.KtSymbolWithMembers
-import org.jetbrains.kotlin.idea.frontend.api.symbols.markers.KtTypeAndAnnotations
 import org.jetbrains.kotlin.idea.frontend.api.types.KtClassType
 import org.jetbrains.kotlin.idea.frontend.api.types.KtType
 import org.jetbrains.kotlin.lexer.KtTokens
@@ -185,7 +182,7 @@ internal fun FirLightClassBase.createMethods(
 
                 if (declaration is KtKotlinPropertySymbol && declaration.isConst) continue
 
-                if (declaration.visibility == KtSymbolVisibility.PRIVATE &&
+                if (declaration.visibility.isPrivateOrPrivateToThis() &&
                     declaration.getter?.hasBody == false &&
                     declaration.setter?.hasBody == false
                 ) continue
@@ -194,7 +191,7 @@ internal fun FirLightClassBase.createMethods(
 
                 fun KtPropertyAccessorSymbol.needToCreateAccessor(siteTarget: AnnotationUseSiteTarget): Boolean {
                     if (isInline) return false
-                    if (!hasBody && visibility == KtSymbolVisibility.PRIVATE) return false
+                    if (!hasBody && visibility.isPrivateOrPrivateToThis()) return false
                     if (declaration.isHiddenOrSynthetic(siteTarget)) return false
                     if (isHiddenOrSynthetic()) return false
                     return true

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/firLightUtils.kt

@@ -245,7 +245,8 @@ internal fun KtSymbolVisibility.toPsiVisibilityForMember(isTopLevel: Boolean): S
 private fun KtSymbolVisibility.toPsiVisibility(isTopLevel: Boolean, forClass: Boolean): String = when (this) {
     // Top-level private class has PACKAGE_LOCAL visibility in Java
     // Nested private class has PRIVATE visibility
-    KtSymbolVisibility.PRIVATE -> if (forClass && isTopLevel) PsiModifier.PACKAGE_LOCAL else PsiModifier.PRIVATE
+    KtSymbolVisibility.PRIVATE, KtSymbolVisibility.PRIVATE_TO_THIS ->
+        if (forClass && isTopLevel) PsiModifier.PACKAGE_LOCAL else PsiModifier.PRIVATE
     KtSymbolVisibility.PROTECTED -> PsiModifier.PROTECTED
     else -> PsiModifier.PUBLIC
 }

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/symbols/firSymbolUtils.kt

@@ -39,6 +39,7 @@ internal fun Visibility?.getSymbolVisibility(): KtSymbolVisibility = when (this)
     Visibilities.Public -> KtSymbolVisibility.PUBLIC
     Visibilities.Protected -> KtSymbolVisibility.PROTECTED
     Visibilities.Private -> KtSymbolVisibility.PRIVATE
+    Visibilities.PrivateToThis -> KtSymbolVisibility.PRIVATE_TO_THIS
     Visibilities.Internal -> KtSymbolVisibility.INTERNAL
     Visibilities.Local -> KtSymbolVisibility.LOCAL
     Visibilities.Unknown -> KtSymbolVisibility.UNKNOWN