RFR: 8336332: Rework tests to avoid unrelated stderr output [v7]

[Andy Goryachev]

On Thu, 18 Sep 2025 15:47:23 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   cleanup
>
> modules/javafx.base/src/test/java/test/javafx/util/OutputRedirect.java line 141:
> 
>> 139: 
>> 140:     private static Map<String, Integer> toMap(Object... expected) {
>> 141:         HashMap<String, Integer> m = new HashMap<>();
> 
> Suggestion: Given how they are used, you might consider using a `Set` (which could be created as either a `LinkedHashSet` or `TreeSet`) instead. This would simplify the logic a bit.

No, I need the counts.
JDK has neither `MultiMap`s nor counting sets.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1897#discussion_r2360175846