[FE] Check visibilities of expected and actual property setters are compatible

^KT-30905 Fixed

compiler/resolution/src/org/jetbrains/kotlin/resolve/multiplatform/ExpectedActualResolver.kt

@@ -370,10 +370,20 @@ object ExpectedActualResolver {
             !equalBy(expected, actual) { p -> p.isVar } -> Incompatible.PropertyKind
             !equalBy(expected, actual) { p -> p.isLateInit } -> Incompatible.PropertyLateinitModifier
             expected.isConst && !actual.isConst -> Incompatible.PropertyConstModifier
+            !arePropertySettersWithCompatibleVisibilities(expected, actual) -> Incompatible.PropertySetterVisibility
             else -> Compatible
         }
     }
 
+    private fun arePropertySettersWithCompatibleVisibilities(expected: PropertyDescriptor, actual: PropertyDescriptor): Boolean {
+        val expectedSetter = expected.setter
+        val actualSetter = actual.setter
+        if (expectedSetter == null || actualSetter == null) {
+            return true
+        }
+        return areDeclarationsWithCompatibleVisibilities(expectedSetter, actualSetter)
+    }
+
     private fun areCompatibleClassifiers(a: ClassDescriptor, other: ClassifierDescriptor): ExpectActualCompatibility<MemberDescriptor> {
         // Can't check FQ names here because nested expected class may be implemented via actual typealias's expansion with the other FQ name
         assert(a.name == other.name) { "This function should be invoked only for declarations with the same name: $a, $other" }