RFR: 8296387: [Tooltip, CSS] -fx-show-delay is only applied to the first tooltip that is shown before it is displayed [v9]

[Andy Goryachev]

On Mon, 8 Jul 2024 22:40:42 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> even with max=200 we might see occasional failures due to load or other circumstances.
>> 
>> I wonder a better approach would be to check whether the measurement of the delay falls sufficiently outside of the default 1000 ms (which in itself might be more than that)?
>
> We have many tests that will occasionally fail with a heavily loaded system.
> 
> The question is whether we can come up with a max delta that we can reliably use that is less than the difference between the default value and the test value. Otherwise, we can't distinguish them.
> 
> On two different test systems, both of which fail pretty consistently with  50 msec, I see a 100% pass rate over several tries with 150 msec. More testing is needed.

Another possibility is the code that measures the time it takes to show the tooltip.

The current code uses Util.waitForLatch(), L244 which was written for a different use case and actually introduces a small measurement error as it includes the time needed for the context switch.  Perhaps a better solution would be to note the timestamp in L271 where the tooltip listener gets called (similar to the way the start moment is captured in L241)

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PR Review Comment: https://git.openjdk.org/jfx/pull/1394#discussion_r1669418098