KT-43941 [Sealed interfaces]: subclass intention

Restriction for sealed inheritors was relaxed. Instead of being nested
class members now they can be the members of the same module and
package.

idea/testData/quickfix/implement/sealedAfter15.kt

@@ -0,0 +1,8 @@
+// "Implement sealed class" "true"
+// WITH_RUNTIME
+// SHOULD_BE_AVAILABLE_AFTER_EXECUTION
+// COMPILER_ARGUMENTS: -XXLanguage:+SealedInterfaces
+
+sealed class <caret>Base {
+    abstract fun foo(): Int
+}

idea/testData/quickfix/implement/sealedAfter15.kt.after

@@ -0,0 +1,14 @@
+// "Implement sealed class" "true"
+// WITH_RUNTIME
+// SHOULD_BE_AVAILABLE_AFTER_EXECUTION
+// COMPILER_ARGUMENTS: -XXLanguage:+SealedInterfaces
+
+sealed class Base {
+    abstract fun foo(): Int
+}
+
+class BaseImpl : Base() {
+    override fun foo(): Int {
+        TODO("Not yet implemented")
+    }
+}

idea/testData/quickfix/implement/sealedEmptyAfter15.kt

@@ -0,0 +1,4 @@
+// "Implement sealed class" "true"
+// SHOULD_BE_AVAILABLE_AFTER_EXECUTION
+// COMPILER_ARGUMENTS: -XXLanguage:+SealedInterfaces
+sealed class <caret>Sealed

idea/testData/quickfix/implement/sealedEmptyAfter15.kt.after

@@ -0,0 +1,5 @@
+// "Implement sealed class" "true"
+// SHOULD_BE_AVAILABLE_AFTER_EXECUTION
+// COMPILER_ARGUMENTS: -XXLanguage:+SealedInterfaces
+sealed class Sealed
+<caret>class SealedImpl : Sealed()

idea/testData/quickfix/implement/sealedWithConflictAfter15.kt

@@ -0,0 +1,12 @@
+// "Implement sealed class" "true"
+// WITH_RUNTIME
+// SHOULD_BE_AVAILABLE_AFTER_EXECUTION
+// COMPILER_ARGUMENTS: -XXLanguage:+SealedInterfaces
+
+sealed class <caret>Base {
+    abstract fun foo(): Int
+
+    class BaseImpl : Base() {
+        override fun foo() = throw UnsupportedOperationException()
+    }
+}

idea/testData/quickfix/implement/sealedWithConflictAfter15.kt.after

@@ -0,0 +1,18 @@
+// "Implement sealed class" "true"
+// WITH_RUNTIME
+// SHOULD_BE_AVAILABLE_AFTER_EXECUTION
+// COMPILER_ARGUMENTS: -XXLanguage:+SealedInterfaces
+
+sealed class Base {
+    abstract fun foo(): Int
+
+    class BaseImpl : Base() {
+        override fun foo() = throw UnsupportedOperationException()
+    }
+}
+
+class BaseImpl : Base() {
+    override fun foo(): Int {
+        TODO("Not yet implemented")
+    }
+}