RFR: 8226990: GTK & Nimbus LAF: Tabbed pane's background color is not expected one when change the opaque checkbox. [v15]

[Prasanta Sadhukhan]

On Fri, 3 May 2024 07:46:07 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> JTabbedPane's content area, tab area and tab background color are not as expected when opaque is set to true or false. 
>> The proposed fix is to handle the TabbedPane's background color in installed LAFs. Manual test is added to support the fix and there is no regression caused by the fix. 
>> 
>> Proposed fix is tested in Ubuntu 22.04 and Oracle linux.
>> 
>> CI link is posted in JBS.
>
> Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Old test bug id added

test/jdk/javax/swing/JTabbedPane/TestJTabbedPaneOpaqueColor.java line 43:

> 41: /*
> 42:  * @test
> 43:  * @bug 8226990 6462396 4690946

Ideally it should be in first-to-last fix order sequence..

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PR Review Comment: https://git.openjdk.org/jdk/pull/17720#discussion_r1588893403