DefaultListSelectionModel: inconsistent lead on removeIndexInterval

FULL PRODUCT VERSION :
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b05)
Java HotSpot(TM) Client VM (build 1.6.0_02-b05, mixed mode)
6 Update 14

ADDITIONAL OS VERSION INFORMATION :
not relevant

EXTRA RELEVANT SYSTEM CONFIGURATION :
not relevant

A DESCRIPTION OF THE PROBLEM :
When removing the indexInterval from 0 to maxSelection, the lead/anchor is
-1 for maxSelection > 0
0 for maxSelection == 0

This is inconsistent: in both cases we remove all possibly selected indices, so the lead/anchor should be the same in both. The correct (expected by me ;-) behaviour is to reset the lead/anchor to -1 (nothing selected, no lead, no anchor).

This is relevant in contexts where clients must keep the lead valid (f.i. in-bounds of the size of a listModel).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run the unit test, the passing fixture is expected, the failing is not <g>

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
see above
ACTUAL -
see above

REPRODUCIBILITY :
This bug can be reproduced always.

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/*
 * $Id: ListSelectionIssues.java,v 1.4 2008/02/12 12:18:36 kleopatra Exp $
 *
 * Copyright 2008 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */
package org.jdesktop.swingx.decorator;

import javax.swing.DefaultListSelectionModel;
import javax.swing.ListSelectionModel;

import junit.framework.TestCase;

/**
 * Test to expose inconsistent lead/anchor state after removeIndexInterval in
 * <code>DefaultListSelectionModel</code>.
 *
 *
 * @author Jeanette Winzenburg
 */
public class ListSelectionBug extends TestCase {


    /**
     * sanity: understand DefaultListSelectionModel behaviour.
     *
     *
     * Here: select index 5, remove 0..5 -> lead == -1
     * This is what I expect - explicitly removing the complete interval from
     * 0 to the maxSelected should reset the lead/anchor to "no lead/anchor"
     */
    public void testLeadAnchorAfterRemoveAll() {
        ListSelectionModel viewSelectionModel = new DefaultListSelectionModel();
        assertLeadAnchorAfterRemoveAll(viewSelectionModel, 5, 0);
    }

    /**
     * sanity: understand DefaultListSelectionModel behaviour.
     *
     * Here: select 0, remove 0..0 --> lead == 0
     *
     * This is unexpected - again we remove the complete interval from
     * 0 to maxSelected, so the lead/anchor should be reset to "no lead/anchor"
     * just in the same way as it is for any maxSelected > 0.
     */
    public void testLeadAnchorAfterRemoveAll0() {
        ListSelectionModel viewSelectionModel = new DefaultListSelectionModel();
        assertLeadAnchorAfterRemoveAll(viewSelectionModel, 0, 0);
    }

    /**
     * Asserts lead/anchor after removeIndexInterval.
     * The setup is to select selectedIndex and removes the
     * index interval [first, selected].
     *
     * @param viewSelectionModel
     * @param selected
     * @param firstOfRemoveInterval, <= selected
     */
    private void assertLeadAnchorAfterRemoveAll(
            ListSelectionModel viewSelectionModel, int selected, int firstOfRemoveInterval) {
        viewSelectionModel.setSelectionInterval(selected, selected);
        assertEquals(selected, viewSelectionModel.getAnchorSelectionIndex());
        assertEquals(selected, viewSelectionModel.getLeadSelectionIndex());
        int length = selected - firstOfRemoveInterval + 1;
        viewSelectionModel.removeIndexInterval(firstOfRemoveInterval, selected);
        int leadAnchor = selected - length;
        assertTrue(viewSelectionModel.isSelectionEmpty());
        assertEquals(leadAnchor, viewSelectionModel.getLeadSelectionIndex());
        assertEquals(leadAnchor, viewSelectionModel.getAnchorSelectionIndex());
    }
    
}

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