RFR: 8226990: GTK & Nimbus LAF: Tabbed pane's background color is not expected one when change the opaque checkbox. [v12]

[Tejesh R]

On Thu, 2 May 2024 14:46:24 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> src/java.desktop/share/classes/javax/swing/plaf/synth/SynthTabbedPaneUI.java line 128:
>> 
>>> 126:     private Color selectColor;
>>> 127:     // Background color for unselected tabs
>>> 128:     private Color unselectedBackground;
>> 
>> Can u recheck `unselectedBackground` purpose once again?
>
> `unselectedBackground` color is used to render the unselected tabs. What else you want me to check?

I don't see the rendering code in `installDefaults()`, can you recheck that.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17720#discussion_r1587808509