RFR: 8306133: Open source few AWT Drag & Drop related tests [v2]

[Sergey Bylokhov]

On Tue, 25 Apr 2023 16:19:15 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> it is fine to call dispose here on the main, but the frame possibly can be null here.
>
> I have updated the tests to all dispose on the EDT just in case.

The problem is not in the "dispose" but in the next check "frame != null" the frame variable can be null here even if frame is shown on the screen.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13591#discussion_r1178722196