RFR: 8190411: NPE in SliderSkin:140 if Slider.Tooltip.autohide is true [v4]

[Karthik P K]

On Mon, 5 Dec 2022 17:18:12 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> Karthik P K has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update in mouse enter and exit events. Update in unit test
>
> tests/system/src/test/java/test/robot/javafx/scene/SliderTooltipNPETest.java line 85:
> 
>> 83: 
>> 84:     private void dragSliderAfterTooltipDisplayed(int dragDistance) throws Exception {
>> 85:         Thread.sleep(1000); // Wait for slider to layout
> 
> is there an equivalent of waitForIdle()?
> 
> could we replace the sleep() with waiting for some event/property instead?

Here I followed the same pattern used in other system tests such as TabPaneDragPolicyTest and ColorPickerTest.
visibleProperty is present for slider but no function is available to handle the event when this peoperty changes.
Please let me know if you have any suggestions.

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PR: https://git.openjdk.org/jfx/pull/965