Fix ultraKtLightClassForFacade compiler backend call

+minor fixes

compiler/light-classes/src/org/jetbrains/kotlin/asJava/classes/KtLightClassForFacade.kt

@@ -21,6 +21,8 @@ import com.intellij.openapi.util.Comparing
 import com.intellij.openapi.util.TextRange
 import com.intellij.openapi.util.registry.Registry
 import com.intellij.psi.*
+import com.intellij.psi.impl.PsiSuperMethodImplUtil
+import com.intellij.psi.impl.java.stubs.PsiJavaFileStub
 import com.intellij.psi.impl.light.LightEmptyImplementsList
 import com.intellij.psi.impl.light.LightModifierList
 import com.intellij.psi.search.GlobalSearchScope
@@ -54,6 +56,12 @@ open class KtLightClassForFacade constructor(
 
     protected open val lightClassDataCache: CachedValue<LightClassDataHolder.ForFacade> = myLightClassDataCache
 
+    protected open val javaFileStub: PsiJavaFileStub?
+        get() = lightClassDataCache.value.javaFileStub
+
+    override val lightClassData
+        get() = lightClassDataCache.value.findDataForFacade(facadeClassFqName)
+
     val files: Collection<KtFile> = files.toSet()
 
     private val firstFileInFacade by lazyPub { files.iterator().next() }
@@ -71,12 +79,14 @@ open class KtLightClassForFacade constructor(
         LightEmptyImplementsList(manager)
 
     private val packageClsFile = FakeFileForLightClass(
-        files.first(),
+        firstFileInFacade,
         lightClass = { this },
-        stub = { lightClassDataCache.value.javaFileStub },
+        stub = { javaFileStub },
         packageFqName = packageFqName
     )
 
+    override fun getParent(): PsiElement = containingFile
+
     override val kotlinOrigin: KtClassOrObject? get() = null
 
     val fqName: FqName
@@ -178,9 +188,6 @@ open class KtLightClassForFacade constructor(
 
     override fun copy() = KtLightClassForFacade(manager, facadeClassFqName, lightClassDataCache, files)
 
-    override val lightClassData
-        get() = lightClassDataCache.value.findDataForFacade(facadeClassFqName)
-
     override fun getNavigationElement() = firstFileInFacade
 
     override fun isEquivalentTo(another: PsiElement?): Boolean {
@@ -243,7 +250,9 @@ open class KtLightClassForFacade constructor(
 
     override fun getStartOffsetInParent() = firstFileInFacade.startOffsetInParent
 
-    override fun isWritable() = firstFileInFacade.isWritable
+    override fun isWritable() = files.all { it.isWritable }
+
+    override fun getVisibleSignatures(): MutableCollection<HierarchicalMethodSignature> = PsiSuperMethodImplUtil.getVisibleSignatures(this)
 
     companion object {
 

compiler/light-classes/src/org/jetbrains/kotlin/asJava/classes/ultraKtLightClassForFacade.kt

@@ -7,7 +7,9 @@ package org.jetbrains.kotlin.asJava.classes
 
 import com.intellij.psi.*
 import com.intellij.psi.impl.PsiSuperMethodImplUtil
+import com.intellij.psi.impl.java.stubs.PsiJavaFileStub
 import com.intellij.psi.util.CachedValue
+import org.jetbrains.kotlin.asJava.builder.LightClassData
 import org.jetbrains.kotlin.asJava.builder.LightClassDataHolder
 import org.jetbrains.kotlin.asJava.elements.KtLightField
 import org.jetbrains.kotlin.asJava.elements.KtLightMethod
@@ -30,6 +32,10 @@ class KtUltraLightClassForFacade(
 
     override val clsDelegate: PsiClass get() = invalidAccess()
 
+    override val lightClassData: LightClassData get() = invalidAccess()
+
+    override val javaFileStub: PsiJavaFileStub? = null
+
     override fun getScope(): PsiElement? = parent
 
     private val filesWithSupportsWithCreators by lazyPub {
@@ -93,8 +99,6 @@ class KtUltraLightClassForFacade(
 
     override fun getOwnMethods() = _ownMethods
 
-    override fun getVisibleSignatures(): MutableCollection<HierarchicalMethodSignature> = PsiSuperMethodImplUtil.getVisibleSignatures(this)
-
     override fun copy(): KtLightClassForFacade =
         KtUltraLightClassForFacade(manager, facadeClassFqName, lightClassDataCache, files, filesWithSupports)
 }

idea/testData/editor/quickDoc/KotlinPackageClassUsedFromJava.java

@@ -6,5 +6,5 @@ class KotlinPackageClassUsedFromJava {
     }
 }
 
-//INFO: <div class='definition'><pre>testing<br>public final class <b>testing.KotlinPackageClassUsedFromJava_DataKt</b>
+//INFO: <div class='definition'><pre>testing<br>public final class <b>KotlinPackageClassUsedFromJava_DataKt</b>
 //INFO: extends <a href="psi_element://java.lang.Object"><code>Object</code></a></pre></div><table class='sections'></table>