Completion for sealed class inheritors and a pair of tests

idea/idea-completion/testData/smart/AbstractMembers.kt

@@ -0,0 +1,13 @@
+package sample
+
+abstract class Foo {
+    object X: Foo()
+    class Y: Foo()
+}
+
+fun foo(){
+    val f : Foo = <caret>
+}
+
+// EXIST: { lookupString:"X", itemText:"X", tailText:" (sample.Foo)" }
+// EXIST: { lookupString:"Y", itemText:"Y", tailText:"() (sample.Foo)" }