RFR: 8336332: Rework tests to avoid unrelated stderr output [v9]

[Kevin Rushforth]

On Thu, 18 Sep 2025 18:00:47 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> modules/javafx.base/src/test/java/test/javafx/util/OutputRedirect.java line 161:
>> 
>>> 159:             map((s) -> findException(s)).
>>> 160:             forEach((c) -> {
>>> 161:                 if (c != null) {
>> 
>> Minor suggestion: filter for non-null Strings before the `forEach` rather than checking for non-null in the `forEach` ?
>
> my version is _more efficient_ :-)

I doubt it. Anyway, it doesn't really matter all that much.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1897#discussion_r2360594144