RFR: 8325566: [TestBug] Util.shutdown() to hide ALL Windows

[Nir Lisker]

On Mon, 18 Mar 2024 22:53:03 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Changing `Util.shutdown()` to hide **all** showing Windows and then call `Platform.exit()`.
> This simplifies the tests and ensures a clean shutdown.

tests/system/src/test/java/test/util/Util.java line 383:

> 381:         runAndWait(() -> {
> 382:             for (Window w : new ArrayList<>(Window.getWindows())) {
> 383:                 w.hide();

I think you can use `List.copyOf` instead of an `ArrayList` since it doesn't get modified (it's a one-time copy).
The iteration can also be

List.copyOf(Window.getWindows()).forEach(Window::hide);

if you want.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1407#discussion_r1531195323