FIR LC: populate inner classes in interfaces

analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/classes/FirLightClassForClassOrObjectSymbol.kt

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.asJava.elements.KtLightField
 import org.jetbrains.kotlin.analysis.api.symbols.KtNamedClassOrObjectSymbol
 import org.jetbrains.kotlin.analysis.api.symbols.markers.KtSymbolKind
 import org.jetbrains.kotlin.light.classes.symbol.classes.checkIsInheritor
+import org.jetbrains.kotlin.light.classes.symbol.classes.createInnerClasses
 import org.jetbrains.kotlin.light.classes.symbol.classes.getOrCreateFirLightClass
 import org.jetbrains.kotlin.load.java.structure.LightClassOriginKind
 import org.jetbrains.kotlin.psi.KtClassBody
@@ -77,7 +78,11 @@ internal abstract class FirLightClassForClassOrObjectSymbol(
     override fun getTypeParameters(): Array<PsiTypeParameter> =
         _typeParameterList?.typeParameters ?: PsiTypeParameter.EMPTY_ARRAY
 
-    abstract override fun getOwnInnerClasses(): List<PsiClass>
+    private val _ownInnerClasses: List<FirLightClassBase> by lazyPub {
+        classOrObjectSymbol.createInnerClasses(manager)
+    }
+
+    override fun getOwnInnerClasses(): List<PsiClass> = _ownInnerClasses
 
     override fun getTextOffset(): Int = kotlinOrigin?.textOffset ?: 0
     override fun getStartOffsetInParent(): Int = kotlinOrigin?.startOffsetInParent ?: 0
@@ -176,4 +181,4 @@ internal abstract class FirLightClassForClassOrObjectSymbol(
         baseClass?.let { InheritanceImplUtil.isInheritorDeep(this, it, classToByPass) } ?: false
 
     abstract override fun copy(): FirLightClassForClassOrObjectSymbol
-}
+}

analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/classes/FirLightClassForSymbol.kt

@@ -85,12 +85,6 @@ internal open class FirLightClassForSymbol(
     override fun getExtendsList(): PsiReferenceList? = _extendsList
     override fun getImplementsList(): PsiReferenceList? = _implementsList
 
-    private val _ownInnerClasses: List<FirLightClassBase> by lazyPub {
-        classOrObjectSymbol.createInnerClasses(manager)
-    }
-
-    override fun getOwnInnerClasses(): List<PsiClass> = _ownInnerClasses
-
     private val _extendsList by lazyPub { createInheritanceList(forExtendsList = true, classOrObjectSymbol.superTypes) }
     private val _implementsList by lazyPub { createInheritanceList(forExtendsList = false, classOrObjectSymbol.superTypes) }
 

analysis/symbol-light-classes/src/org/jetbrains/kotlin/light/classes/symbol/classes/FirLightInterfaceOrAnnotationClassSymbol.kt

@@ -45,11 +45,9 @@ internal abstract class FirLightInterfaceOrAnnotationClassSymbol(
 
     override fun getImplementsList(): PsiReferenceList? = null
 
-    override fun getOwnInnerClasses(): List<PsiClass> = emptyList()
-
     override fun isInterface(): Boolean = true
 
     override fun isEnum(): Boolean = false
 
     override fun isValid(): Boolean = super.isValid() && classOrObjectSymbol.isValid()
-}
+}