Issue #2661: Enforce OverridableMethodInConstructor of sevntu-checkstyle over Checkstyle source code

config/checkstyle_sevntu_checks.xml

@@ -65,5 +65,10 @@
         <module name="EnumValueNameCheck">
             <property name="objFormat" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
         </module>
+        <module name="OverridableMethodInConstructor">
+            <property name="checkCloneMethod" value="true"/>
+            <property name="checkReadObjectMethod" value="true"/>
+            <property name="matchMethodsByArgCount" value="true"/>
+        </module>
     </module>
 </module>

src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeTableModel.java

@@ -222,7 +222,7 @@ public class ParseTreeTableModel implements TreeModel {
      * @param children An array of Object containing the inserted, removed, or changed objects.
      * @see EventListenerList
      */
-    void fireTreeStructureChanged(Object source, Object[] path,
+    final void fireTreeStructureChanged(Object source, Object[] path,
                                   int[] childIndices,
                                   Object... children) {
         // Guaranteed to return a non-null array