RFR: 8279228 Leak in ScrollPaneSkin, related to touch events

[Kevin Rushforth]

On Thu, 23 Dec 2021 17:43:19 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

> Fixing memoryleak, related to touch events in ScrollPaneWhen touchDetected or mouseDown is true, the sbTouch animation is running, 
> and the node is removed from the Scene, then the animation will never stop, causing a memory leak.
> A simple fix is to also check, whether the Node is visible, by checking the "isTreeShowing" property.

Two quick questions:

1. The fix checks whether or not the node is treeShowing at the time the `startSBReleasedAnimation` method is called. Is this sufficient? If a node's tree showing state changes, is it guaranteed that this method will be called?
2. Can you provide an automated test for this?

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PR: https://git.openjdk.java.net/jfx/pull/701