RFR: 8339879: Open some dialog swing tests [v2]

[Alisen Chung]

On Thu, 26 Sep 2024 06:59:32 GMT, Tejesh R <tr at openjdk.org> wrote:

>> Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   update jtreg
>
> test/jdk/java/awt/Dialog/ShownModalDialogSerializationTest.java line 66:
> 
>> 64:     static void deleteTestUI() {
>> 65:         if (dialog != null) {
>> 66:             dialog.setVisible(false);
> 
> Can be removed.

WIll keep this for test stability

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PR Review Comment: https://git.openjdk.org/jdk/pull/21196#discussion_r1777372586