RFR: 8283507: Create a regression test for RFE 4287690 [v3]

[Sergey Bylokhov]

On Fri, 8 Apr 2022 07:12:21 GMT, Manukumar V S <mvs at openjdk.org> wrote:

>> Create a regression test for [JDK-4287690](https://bugs.openjdk.java.net/browse/JDK-4287690)
>> Issue description:
>> I want JComboBox to send an event just before the popup (drop down) list is displayed.
>> 
>> Fix:
>> This requires some additional API targeted for major release of the JDK (1.4).The PopupMenuEvent will from the JPopupMenu will be forwarded to the JComboBox. A client of the JComboBox can register itself as a PopupMenuListener to receive the notification.
>> So JComboBox should send drop down events when the drop down popup is visible as well as invisible. JComboBox.addPopupMenuListener(PopupMenuListener) can be used to register for pop up events.
>> 
>> Testing:
>> Tested using Mach5 in all platforms available(macos,linux and windows) and got all pass.
>
> Manukumar V S has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comment fixed: Removed unwanted directory

Marked as reviewed by serb (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/7906