src/share/classes/javax/swing/plaf/basic/BasicComboBoxEditor.java

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@@ -127,10 +127,11 @@
 
     public void removeActionListener(ActionListener l) {
         editor.removeActionListener(l);
     }
 
+    @SuppressWarnings("serial") // Superclass is not serializable across versions
     static class BorderlessTextField extends JTextField {
         public BorderlessTextField(String value,int n) {
             super(value,n);
         }