--- a/core.windows/src/org/netbeans/core/windows/view/ui/CloseButtonTabbedPane.java     Thu Jul 07 12:08:51 2016 +0000
+++ b/core.windows/src/org/netbeans/core/windows/view/ui/CloseButtonTabbedPane.java     Tue Oct 25 21:33:55 2016 -0400
@@ -565,6 +565,11 @@
             };
             add(label);
             JButton tabCloseButton = CloseButtonFactory.createCloseButton();
+            if (IS_AQUA_LAF) {
+              // Bug #251441: Improve positioning of label and close button within the tab button.
+              setBorder(BorderFactory.createEmptyBorder(1, 0, 0, 0));
+              tabCloseButton.setBorder(BorderFactory.createEmptyBorder(2, 2, 0, 0));
+            }
             tabCloseButton.addActionListener(new ActionListener() {
 
                 @Override