RFR: 8236505: Mark jdk/editpad/EditPadTest.java as @headful

Fri Sep 17 06:46:45 UTC 2021

On Thu, 16 Sep 2021 09:47:16 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

>> This is a GUI test, and it should be `@headful`.
>> 
>> Additional testing:
>>  - [x] Test still runs in default, and does not run with `!headful`
>
> Ah, right, I thought it is a JShell test, but it is not. Sorry for the noise.

@lahodaj, would you like to formally ack this PR?

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PR: https://git.openjdk.java.net/jdk/pull/5544