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

[Sergey Bylokhov]

On Tue, 7 Jun 2022 04:15:49 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).

I have found that the simpler version of the test can be used to verify that old bug. the patch is updated.

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