RFR: JDK-8299052: ViewportOverlapping test fails intermittently on Win10 & Win11

[Harshitha Onkar]

On Wed, 21 Dec 2022 20:03:38 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> @jaikiran Thank you for the details. I'll check if the duration of run differed drastically. I thought all the client tests run in non-concurrent mode by default or does this differ for headful and headless test?
>
> *Headful* tests are not supposed concurrently: they display UI and often use Robot to send input events to the UI. Running such tests concurrently leads to obscure failures. In our CI system, `JTREG_JOBS=1` is passed to `make` when running headful tests.
> 
> There's a set of *headless* tests which can be run concurrently. Such tests will be affected if they're run concurrently.

@aivanov-jdk If it affects the run time of certain group of tests then it is better not to add it to `exclusiveAccess.dirs` and explicitly specify the `JTREG_JOBS=1` instead as both produce same results?

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PR: https://git.openjdk.org/jdk/pull/11747