Add "close on middle mouse click on the tab" support

Author: DavidePastore

app/src/main/groovy/org/jd/gui/view/component/panel/TabbedPanel.groovy

@@ -15,6 +15,7 @@ import javax.swing.JComponent
 import javax.swing.JMenu
 import javax.swing.JMenuItem
 import javax.swing.JPopupMenu
+import javax.swing.SwingUtilities
 import javax.swing.ToolTipManager
 import javax.swing.event.ChangeEvent
 import java.awt.BorderLayout
@@ -115,6 +116,17 @@ class TabbedPanel extends JPanel implements PreferencesChangeListener {
         tab.toolTipText = tip
         tab.add(new JLabel(title, icon, JLabel.LEADING), BorderLayout.CENTER)
 		tab.add(tabCloseButton, BorderLayout.EAST)
+        tab.addMouseListener(new MouseListener() {
+            void mousePressed(MouseEvent e) {}
+            void mouseReleased(MouseEvent e) {}
+            void mouseEntered(MouseEvent e) { }
+            void mouseExited(MouseEvent e) {}
+            void mouseClicked(MouseEvent e) {
+                if(SwingUtilities.isMiddleMouseButton(e)) {
+                    removeComponent(page)
+                }
+            }
+        })
         ToolTipManager.sharedInstance().unregisterComponent(tab)
 
 		int index = tabbedPane.getTabCount()