RFR: JDK-8290469: Add new positioning options to PassFailJFrame test framework [v6]

[Phil Race]

On Fri, 5 Aug 2022 20:14:35 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> The intention is that it can be called either way - on or off.
>
> Is that possible? Toolkit thread is not EDT, therefore native events are processed, it's probably enough to update the frame coordinates while EDT is blocked and doesn't handle events.

Can you expand on what you mean ? 
What's the problem with native events being processed ? We want that.
And this obviously isn't being called on the toolkit thread.

This change isn't doing anything to that method that might change threading reqts or rules of use.
Any problems already existed. What is being changed (apart from adding the new API) is just to make it more robust.

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PR: https://git.openjdk.org/jdk/pull/9525