Checked that KT-13766 Fixed by some changes in resolve

#KT-13766 Fixed

idea/testData/editor/optimizeImports/KT13766.kt

@@ -0,0 +1,22 @@
+import java.util.*
+
+class Outer {
+
+    private abstract class Base {
+
+        protected sealed class Sealed {
+            object OOO : Sealed()
+        }
+
+        typealias OOO = Sealed.OOO
+    }
+
+    private class Derived : Base() {
+
+        fun foo(): Sealed {
+            ArrayList<Int>()
+            return OOO
+        }
+
+    }
+}

idea/testData/editor/optimizeImports/KT13766.kt.after

@@ -0,0 +1,22 @@
+import java.util.ArrayList
+
+class Outer {
+
+    private abstract class Base {
+
+        protected sealed class Sealed {
+            object OOO : Sealed()
+        }
+
+        typealias OOO = Sealed.OOO
+    }
+
+    private class Derived : Base() {
+
+        fun foo(): Sealed {
+            ArrayList<Int>()
+            return OOO
+        }
+
+    }
+}