Allow sealed inheritors for expect sealed classes in MPP submodules

KT-45842 Fixed
KTIJ-7068

idea/testData/multiplatform/sealedInheritorsInComplexModuleStructure2/common/common.kt

@@ -0,0 +1,16 @@
+package foo
+
+/*
+ * - Sealed1 [common], actualized in [main]
+ *   - Sealed2 [common], actualized in [intermediate]
+ *     - Derived11 [common]
+ *     - Derived12 [intermediate]
+ *   - Derived1 [common]
+ *   - Derived2 [intermediate]
+ *   - Derived3 [main]
+ */
+expect sealed class <!LINE_MARKER("descr='Has subclasses'")!>Sealed1<!>()
+expect sealed class <!LINE_MARKER("descr='Is subclassed by Derived11 Derived12 Derived13Error'"), LINE_MARKER("descr='Has actuals in JVM'")!>Sealed2<!>() : Sealed1
+
+class Derived1 : Sealed1()
+class Derived11 : Sealed2()

idea/testData/multiplatform/sealedInheritorsInComplexModuleStructure2/dependencies.txt

@@ -0,0 +1,8 @@
+MODULE common { platform=[JVM, JS, Native]; root=common }
+MODULE intermediate { platform=[JVM]; root=intermediate }
+MODULE main { platform=[JVM]; root=main }
+MODULE real-main { platform=[JVM]; root=real-main }
+
+intermediate -> common { kind=DEPENDS_ON }
+main -> intermediate { kind=DEPENDS_ON }
+real-main -> main { kind=DEPENDS_ON }

idea/testData/multiplatform/sealedInheritorsInComplexModuleStructure2/intermediate/intermediate.kt

@@ -0,0 +1,6 @@
+package foo
+
+actual sealed class <!LINE_MARKER("descr='Is subclassed by Derived12 Derived13Error'"), LINE_MARKER("descr='Has declaration in common module'")!>Sealed2<!> : Sealed1()
+
+class Derived2 : Sealed1()
+class Derived12 : Sealed2()

idea/testData/multiplatform/sealedInheritorsInComplexModuleStructure2/main/main.kt

@@ -0,0 +1,6 @@
+package foo
+
+actual sealed class <!LINE_MARKER("descr='Is subclassed by Derived2 Derived3Error'")!>Sealed1<!> actual constructor()
+
+class Derived2 : Sealed1()
+class Derived13Error : <!SEALED_INHERITOR_IN_DIFFERENT_MODULE!>Sealed2<!>() // should be an error

idea/testData/multiplatform/sealedInheritorsInComplexModuleStructure2/real-main/real-main.kt

@@ -0,0 +1,3 @@
+package foo
+
+class Derived3Error : <!SEALED_INHERITOR_IN_DIFFERENT_MODULE!>Sealed1<!>() // should be an error