RFR: 8252713: jtreg time out of CtrlASCII.java seems to hang the Xserver.

[Phil Race]

On Thu, 17 Nov 2022 15:51:50 GMT, Alexander Zvegintsev <azvegint at openjdk.org> wrote:

> This test needs more stabilization:
> 
> - The test can be easily hang by replacing <br> iteration on `keycharHash.elements()` with `keycharHash.forEach((k, v) -> punchCtrlKey(robot, v));` 
> I do not see any reason why we need a synchronized `Hashtable`, so switched to `HashMap`
> Looks like it might be a reason of original test hanging.
> - `keyRelease`, `dispose` calls wrapped with finally block
> - Just to be safe added timeout `@run main/timeout=600` ( none of the CI test runs took too long thought)
> 
> CI testing looks good on all platforms.

It was a deadlock on the table access, due to some internals of Hashtable this should cure it.
Although I wonder if that wouldn't be a bug in the collections classes ?

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Marked as reviewed by prr (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11214