RFR: 8343123: Nimbus: javax/swing/JInternalFrame/bug6726866.java does not have green undecorated window

[Tejesh R]

On Wed, 13 Nov 2024 02:40:16 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> Test fails in NimbusL&F as DesktopPane does not have green background as set by the user, which is because, the auto-generated [DesktopPanePainter class](https://github.com/openjdk/jdk/blob/eb40a88f4076360708402454a494907e8c0c845d/src/java.desktop/share/classes/javax/swing/plaf/nimbus/SynthPainterImpl.java#L100-L102) which has pre-coded color values does not honour user-defined color.
> 
> Fix is to make sure user-defined DesktopPane background color is honoured and is painted and only auto-generated class for L&F derived colors.
> CI is ok..

Please update `SynthPainterImpl` file copywrite year.

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PR Review: https://git.openjdk.org/jdk/pull/22057#pullrequestreview-2437878266