matthiasblaesing opened a new pull request, #6882:
URL: https://github.com/apache/netbeans/pull/6882

   With JDK21 validation of removeIndexInterval and addIndexInterval methods 
was improved. This reveals an issue in the table model change events, that are 
published by the TaskListModel. For example it was observed, that the startRow 
and endRow indices were issued in the wrong order.
   
   This results in:
   
   ```
   java.lang.IndexOutOfBoundsException: index or length is negative
        at 
java.desktop/javax.swing.DefaultListSelectionModel.insertIndexInterval(DefaultListSelectionModel.java:656)
        at java.desktop/javax.swing.JTable.tableRowsInserted(JTable.java:4539)
        at java.desktop/javax.swing.JTable.tableChanged(JTable.java:4475)
        at 
java.desktop/javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableModel.java:302)
        at 
java.desktop/javax.swing.table.AbstractTableModel.fireTableRowsInserted(AbstractTableModel.java:237)
        at 
org.netbeans.modules.tasklist.ui.TaskListModel$1.run(TaskListModel.java:143)
        at 
java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
        at 
java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
   ```


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