RFR: 8307299: Move more DnD tests to open

[Alisen Chung]

On Tue, 2 May 2023 19:42:44 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> Added DnD tests
>
> test/jdk/java/awt/dnd/IntraJVMGetDropSuccessTest.java line 275:
> 
>> 273:         }
>> 274: 
>> 275:         Component c = clickedComponent;
> 
> this field is used on EDT and the main thread, some synchronisation is needed.

Should I put that field on the EDT as well?

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PR Review Comment: https://git.openjdk.org/jdk/pull/13759#discussion_r1183010708