[FIR] Allow actualization of expect classes by classes with wider visibility

^KT-59355 Fixed

compiler/testData/diagnostics/tests/multiplatform/widerVisibilityInActualClassifier.fir.kt

@@ -0,0 +1,34 @@
+// ISSUE: KT-59355
+
+// MODULE: common
+internal expect open class Some {
+    protected class ProtectedNested
+    internal class InternalNested
+
+    public fun publicFun()
+    internal fun internalFun()
+    protected fun protectedFun()
+}
+
+internal expect open class Other {
+    protected class ProtectedNested
+    internal class InternalNested
+}
+
+// MODULE: platform-jvm()()(common)
+public actual open class Some { // should be allowed
+    public class ProtectedNested  // should be allowed
+    public class InternalNested // should be allowed
+
+    public actual fun publicFun() {} // should be allowed
+    public actual fun internalFun() {} // should be allowed
+    public actual fun protectedFun() {} // should be allowed
+}
+
+public open class PlatformOther { // should be allowed
+    public class ProtectedNested  // should be allowed
+    public class InternalNested // should be allowed
+}
+
+internal actual typealias Other = PlatformOther // should be allowed
+

compiler/testData/diagnostics/tests/multiplatform/widerVisibilityInActualClassifier.kt

@@ -0,0 +1,34 @@
+// ISSUE: KT-59355
+
+// MODULE: common
+internal expect open class <!NO_ACTUAL_FOR_EXPECT!>Some<!> {
+    protected class ProtectedNested
+    internal class InternalNested
+
+    public fun publicFun()
+    internal fun internalFun()
+    protected fun protectedFun()
+}
+
+internal expect open class <!NO_ACTUAL_FOR_EXPECT!>Other<!> {
+    protected class ProtectedNested
+    internal class InternalNested
+}
+
+// MODULE: platform-jvm()()(common)
+<!ACTUAL_WITHOUT_EXPECT!>public<!> actual open class Some { // should be allowed
+    <!ACTUAL_WITHOUT_EXPECT!>public<!> class <!ACTUAL_MISSING!>ProtectedNested<!>  // should be allowed
+    <!ACTUAL_WITHOUT_EXPECT!>public<!> class <!ACTUAL_MISSING!>InternalNested<!> // should be allowed
+
+    public actual fun publicFun() {} // should be allowed
+    public actual fun internalFun() {} // should be allowed
+    public actual fun protectedFun() {} // should be allowed
+}
+
+public open class PlatformOther { // should be allowed
+    public class ProtectedNested  // should be allowed
+    public class InternalNested // should be allowed
+}
+
+<!ACTUAL_WITHOUT_EXPECT!>internal<!> actual typealias Other = PlatformOther // should be allowed
+