RFR: 8329471: Remove GTK2 [v4]

[Phil Race]

On Tue, 30 Jul 2024 17:51:06 GMT, Alexander Zvegintsev <azvegint at openjdk.org> wrote:

>> GTK2 support for Swing/AWT was deprecated for removal in JDK 21. 
>> 
>> It's being removed because no platform that supports the JDK needs it.
>> 
>> Manual and automated testing is green.
>
> Alexander Zvegintsev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   more cleanup

src/java.desktop/share/classes/com/sun/java/swing/plaf/gtk/GTKPainter.java line 215:

> 213:         if (gtkState == SynthConstants.MOUSE_OVER) {
> 214:             if (GTKLookAndFeel.is3()) {
> 215:                 paintComponentBackground(context, g, x, y, w, h);

So do we really need the is3() check ?? Seems like not to me. Same for the case below at line 573.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20378#discussion_r1698939219