JXMultiSplitPane hiding node causes painting issues

1. import java.awt.event.ActionEvent;
2. import java.awt.event.ActionListener;
3.  
4. import javax.swing.JButton;
5. import javax.swing.JFrame;
6. import javax.swing.SwingUtilities;
7.  
8. import org.jdesktop.swingx.JXMultiSplitPane;
9. import org.jdesktop.swingx.MultiSplitLayout;
10. import org.jdesktop.swingx.MultiSplitLayout.Divider;
11. import org.jdesktop.swingx.MultiSplitLayout.Leaf;
12. import org.jdesktop.swingx.MultiSplitLayout.Node;
13. import org.jdesktop.swingx.MultiSplitLayout.Split;
14.  
15. public class TestMultiSplitPane {
16.  
17.     public static final String LEFT = "left";
18.     public static final String CENTER = "center";
19.     public static final String RIGHT = "right";
20.  
21.     public static final String TOP = "top";
22.     public static final String MIDDLE = "middle";
23.     public static final String BOTTOM = "bottom";
24.  
25.     protected void initUI() {
26.         JFrame frame = new JFrame();
27.         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
28.         Split horizontal = new Split();
29.         Split left = getVerticalSplit(LEFT, 0.5, 0.5);
30.         left.setWeight(0.2);
31.         Split center = getVerticalSplit(CENTER, 0.8, 0.2);
32.         center.setWeight(0.6);
33.         Split right = getVerticalSplit(RIGHT, 0.5, 0.5);
34.         right.setWeight(0.2);
35.         horizontal.setChildren(left, new Divider(), center, new Divider(), right);
36.         MultiSplitLayout layout = new MultiSplitLayout(horizontal);
37.         JXMultiSplitPane splitPane = new JXMultiSplitPane(layout);
38.         addButton(LEFT + TOP, splitPane);
39.         addButton(CENTER + TOP, splitPane);
40.         addButton(RIGHT + TOP, splitPane);
41.         addButton(LEFT + BOTTOM, splitPane);
42.         addButton(CENTER + BOTTOM, splitPane);
43.         addButton(RIGHT + BOTTOM, splitPane);
44.         frame.add(splitPane);
45.         frame.setBounds(50, 50, 1024, 768);
46.         frame.setVisible(true);
47.     }
48.  
49.     protected void addButton(final String buttonName, final JXMultiSplitPane splitPane) {
50.         final JButton button = new JButton(buttonName);
51.         splitPane.add(buttonName, button);
52.         button.addActionListener(new ActionListener() {
53.  
54.             @Override
55.             public void actionPerformed(ActionEvent e) {
56.                 MultiSplitLayout layout = splitPane.getMultiSplitLayout();
57.                 Node node = layout.getNodeForName(buttonName);
58.                 Split parent = node.getParent();
59.                 parent.hide(node);
60.                 splitPane.invalidate();
61.                 splitPane.revalidate();
62.                 splitPane.repaint();
63.             }
64.         });
65.     }
66.  
67.     public Split getVerticalSplit(String name, double topWeight, double bottomWeight) {
68.         Split split = new Split();
69.         split.setRowLayout(false);
70.         Leaf top = new Leaf(name + TOP);
71.         top.setWeight(topWeight);
72.         Leaf bottom = new Leaf(name + BOTTOM);
73.         bottom.setWeight(bottomWeight);
74.         split.setChildren(top, new Divider(), bottom);
75.         return split;
76.     }
77.  
78.     public static void main(String[] args) {
79.         SwingUtilities.invokeLater(new Runnable() {
80.  
81.             @Override
82.             public void run() {
83.                 new TestMultiSplitPane().initUI();
84.  
85.             }
86.         });
87.     }
88.  
89. }
90.        
91. <dependency>
92.         <groupId>org.swinglabs.swingx</groupId>
93.         <artifactId>swingx-core</artifactId>
94.         <version>1.6.3</version>
95.     </dependency>