8294046: Newly added test test/jdk/javax/swing/JTabbedPane/TestNPEStateChgListener.java fails in macos

Reviewed-by: azvegint, prr

Author: prsadhuk

src/java.desktop/macosx/classes/com/apple/laf/AquaTabbedPaneUI.java

@@ -810,6 +810,7 @@ public void propertyChange(final PropertyChangeEvent e) {
     protected ChangeListener createChangeListener() {
         return new ChangeListener() {
             public void stateChanged(final ChangeEvent e) {
+                JTabbedPane tabPane = (JTabbedPane)e.getSource();
                 if (!isTabVisible(tabPane.getSelectedIndex())) popupSelectionChanged = true;
                 tabPane.revalidate();
                 tabPane.repaint();

test/jdk/javax/swing/JTabbedPane/TestNPEStateChgListener.java

@@ -23,7 +23,7 @@
 /*
  * @test
  * @key headful
- * @bug 6286501
+ * @bug 6286501 8294046
  * @summary  Verifies if NPE is thrown from stateChanged listener of JTabbedPane
   * @run main TestNPEStateChgListener
  */