RFR: 8287876: The recently de-problemlisted TestTitledBorderLeak test is unstable [v2]

[Phil Race]

On Tue, 7 Jun 2022 11:36:52 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> This is an update of the test which was de-problemlisted [here](https://github.com/openjdk/jdk/pull/8450).
>> 
>> Looks like the initial root cause of the issue was related to the last disposed frame which for some reason was not deleted from the memory, for that issue, the [next](https://bugs.openjdk.org/browse/JDK-8287707) bug was reported.
>> But that change also replaced the usage of weak references by the Runtime.getRuntime().freeMemory() which is not stable enough to verify the leak - its return values vary a lot.
>> 
>> This change returns the usage of weak references and tests only one instance of TitledBorder which is enough to verify the old [bug](https://bugs.openjdk.org/browse/JDK-8204963).
>
> Sergey Bylokhov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Smaller version

Marked as reviewed by prr (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/9051