RFR: 8352905: Open some JComboBox bugs 1 [v2]

[Alisen Chung]

On Fri, 11 Apr 2025 03:52:05 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> Alisen Chung has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - update tests
>>  - update tests
>
> test/jdk/javax/swing/JComboBox/bug4166593.java line 65:
> 
>> 63:         }
>> 64: 
>> 65:         if (frame != null) {
> 
> frame is initialized on a different thread and accessed here without proper synchronization.
> 
> same issue with numberOfActionEvents

added volatile to numberOfActionEvents, moved all access of frame into EDT

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PR Review Comment: https://git.openjdk.org/jdk/pull/24495#discussion_r2046368944