RFR: 8316627: JViewport Test headless failure [v3]

[Damon Nguyen]

On Wed, 20 Sep 2023 21:56:50 GMT, Phil Race <prr at openjdk.org> wrote:

>> The adjustmentListener therefore seems irrelevant too.
>
> Seems to me the test reduces to
> import javax.swing.JPanel;
> import javax.swing.JScrollBar;
> import javax.swing.JScrollPane;
> 
> public class bug4546474 {
>  
>     public static void main(String[] args) {
>         JPanel panel = new JPanel();
>         JScrollPane  scrollpane = new JScrollPane(panel,
>                 JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
>                 JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
>         JScrollBar sbar = scrollpane.getVerticalScrollBar();
>         scrollpane.setViewportView(null);
> 
>         if (sbar.getVisibleAmount() > 0) {
>             throw new RuntimeException("Vertical scrollbar is not " +
>                     "updated when viewport is replaced");
>         }
>     }
> }

Updated similarly. Thanks

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PR Review Comment: https://git.openjdk.org/jdk/pull/15847#discussion_r1332224222