Quick-fix for DELEGATED_MEMBER_HIDES_SUPERTYPE_OVERRIDE added #KT-15966 Fixed

idea/testData/quickfix/specifyOverrideExplicitly/lists2.kt

@@ -0,0 +1,10 @@
+// "Specify override for 'size: Int' explicitly" "true"
+// WITH_RUNTIME
+
+import java.util.*
+
+class <caret>B(private val f: MutableList<String>): ArrayList<String>(), MutableList<String> by f {
+    override fun isEmpty(): Boolean {
+        return f.isEmpty()
+    }
+}