RFR: 8306133: Open source few AWT Drag & Drop related tests

[Sergey Bylokhov]

On Fri, 21 Apr 2023 22:07:12 GMT, Phil Race <prr at openjdk.org> wrote:

>> test/jdk/java/awt/dnd/NextDropActionTest/NextDropActionTest.java line 159:
>> 
>>> 157:             }
>>> 158:         } finally {
>>> 159:             if (frame != null) {
>> 
>> frame is created with in EDT but disposing without EDT ?
>
> There's no harm in doing that but I'm not sure its necessary for the dispose().

it is fine to call dispose here on the main, but the frame possibly can be null here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13591#discussion_r1174217484