I would think about something like:
-------------
    public class TabbedPaneLayout implements LayoutManager {

protected int basePreferredTabAreaWidth(final int tabPlacement, final int height) {
            // TabbedPaneLayout preferredTabAreaWidth implementation
        }

protected int truncatingPreferredTabAreaWidth(final int tabPlacement, final int height) { if (tabPlacement == SwingConstants.LEFT || tabPlacement == SwingConstants.RIGHT) {
                return basePreferredTabAreaWidth(tabPlacement, height);
            }

            return basePreferredTabAreaWidth(tabPlacement, height);
        }

protected int preferredTabAreaWidth(final int tabPlacement, final int height) {
            return basePreferredTabAreaWidth(tabPlacement, height);
        }

    }

    class TabbedPaneScrollLayout extends TabbedPaneLayout {
        @Override
protected int basePreferredTabAreaWidth(int tabPlacement, int height) {
            // TabbedPaneScrollLayout preferredTabAreaWidth implementation
        }
    }

protected class AquaTruncatingTabbedPaneLayout extends AquaTabbedPaneCopyFromBasicUI.TabbedPaneLayout {

        @Override
protected int preferredTabAreaWidth(final int tabPlacement, final int height) {
            return truncatingPreferredTabAreaWidth(tabPlacement, height);
        }
    }

protected class AquaTruncatingTabbedScrollPaneLayout extends AquaTabbedPaneCopyFromBasicUI.TabbedPaneScrollLayout {

        @Override
protected int preferredTabAreaWidth(final int tabPlacement, final int height) {
            return truncatingPreferredTabAreaWidth(tabPlacement, height);
        }
    }
-------------

I just have one more question. The TabbedPaneScrollLayout is only created in AquaTabbedPaneCopyFromBasicUI. AquaLookAndFeel only use AquaTabbedPaneUI or AquaTabbedPaneContrastUI which do not return TabbedPaneScrollLayout.

Are there any real cases when the TabbedPaneScrollLayout is created?

When you enabled the AquaTruncatingTabbedScrollPaneLayout in the AquaTabbedPaneUI the JTabbedPane L&F with SCROLL_TAB_LAYOUT does not look similar to Aqua L&F:
http://cr.openjdk.java.net/~alexsch/8137169/aqua-scrolled-tabbed-pane.png

The AquaTruncatingTabbedPaneLayout already contains arrows for hidden tabs navigation.
May be the fix should update the AquaTruncatingTabbedPaneLayout only?

Thanks,
Alexandr.

On 18/03/16 14:21, Avik Niyogi wrote:
Hi Alexander,
Thank you for the inputs. I agree with you and did feel the need for removing duplicate code as well. But as per an earlier review input, changes to the super call lay outing is not accepted. This was the only other feasible solution. Created redundant code in this process, but would be maintaining with requirements with code impact to superclasses. Please provide any insight to a probable compensate to mitigate this dichotomy of code expectation. Thank you in advance.

With Regards,
Avik Niyogi
On 18-Mar-2016, at 2:42 pm, Alexander Scherbatiy <alexandr.scherba...@oracle.com <mailto:alexandr.scherba...@oracle.com>> wrote:


It is not usually a good idea to have a duplicated code which should be updated every time in several places.

Is it possible to move the methods used both in AquaTruncatingTabbedPaneLayout and AquaTruncatingTabbedScrollPaneLayout to TabbedPaneLayout with different names and then reused?

Thanks,
Alexandr.

On 17/03/16 17:17, Avik Niyogi wrote:
Hi Alexander,
The issue only applies for ScrollingTabbedPane and hence this fix.

With Regards,
Avik Niyogi

On 16-Mar-2016, at 4:51 pm, Alexander Scherbatiy <alexandr.scherba...@oracle.com <mailto:alexandr.scherba...@oracle.com>> wrote:


Does the same issue affects the AquaTabbedPaneContrastUI?

Thanks,
Alexandr.

On 14/03/16 09:04, Avik Niyogi wrote:
Hi All,
A gentle reminder, please review code changes.

With Regards,
Avik Niyogi
On 08-Mar-2016, at 9:51 pm, Avik Niyogi <avik.niy...@oracle.com> wrote:

Hi All,

Please review code changes done as with inputs provided.
http://cr.openjdk.java.net/~aniyogi/8137169/webrev.01/ <http://cr.openjdk.java.net/%7Eaniyogi/8137169/webrev.01/>

Also, albeit the title of issue mentioned is as above, the injection of issue occurs because *pane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);* is not honoured. In the new fix as provided, references to base class layout manager is removed in current solution.

With Regards,
Avik Niyogi

On 02-Mar-2016, at 7:50 pm, Alexander Potochkin <alexander.potoch...@oracle.com> wrote:

Hello Avik

Let me make it clear I don't approve the proposed fix
and ask you to do additional evaluation.

Every LookAndFeel is different and it doesn't make much sense
to compare Metal LaF with AquaLaf.

The AquaLaf mimics the native MacOS controls and therefore look quite different from any other Lafs.

The bug you are fixing has the following subject
"Incorrect minimal heigh of JTabbedPane with more tabs"

Could you please fix exactly the problem with the minimal heights,
without changing the UI delegate class.

Thanks
alexp

Gentle reminder. Please review this fix.

On 26-Feb-2016, at 10:39 am, Avik Niyogi <avik.niy...@oracle.com> wrote:

The issue is with setting of TabbedPane*Scroll*Layout() for the option JTabbedPane.SCROLL_TAB_LAYOUT as is enabled in the test code
 and *not* TabbedPaneLayout() as which is the default.

The minimum size fixes itself because the *ScrollLayout* check fails in *setTabLayoutPolicy*() for the pane. So the issue is with the call to set layout manager. There are only two configurations that the *JTabbedPane* can exist in of which *SCROLL_TAB_LAYOUT* is one of them.

Fixing the minimum size in *AquaTabbedPaneUI* will fix it for *TabbedPaneLayout*() only which is the *WRAP_TAB_LAYOUT*.

Also, I have checked other implementations such as for *Metal* and *Motif* and *they have similar code for doing this process*. Hence, with in-depth analysis, this fix has no other impact apart from this fix.

In case the impact caused by this change has caused some definitive regressions, please mention them so they can be addressed. Thank you.

With Regards,
Avik Niyogi

On 25-Feb-2016, at 6:45 pm, Alexander Potochkin <alexander.potoch...@oracle.com> wrote:

Hello Avik

AquaTruncatingTabbedPaneLayout has a lot of code which is specific for the AquaTabbedPaneUI. I don't think setting the layout manager from the base class is the right solution here.

If there is a problem with minimum size it should be fixed inside the AquaTabbedPaneUI

Thanks
alexp

On 2/24/2016 12:07, Avik Niyogi wrote:
Hi All,

Kindly review the bug fix for JDK 9.

*Bug:*
https://bugs.openjdk.java.net/browse/JDK-8137169

*Webrev:*

http://cr.openjdk.java.net/~aniyogi/8137169/webrev.00/

*Issue:*
For Aqua Look&Feel, multiple calls to pane.getMinimumSize().height causes incremental return of values.

*Cause:*
The impact was caused by a major broken code within AquaTabbedPaneUI.java for createLayoutManager()

*Fix:*
Major linking calls to super class fix done within createLayoutManager().

With Regards,
Avik Niyogi











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