RFR: 8279214: Memory leak in Scene after dragging a cell

[Andy Goryachev]

On Wed, 14 Sep 2022 18:44:14 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

> This PR fixes a memory leak in dnd code in the `MouseHandler` of a `Scene`.
> The memory leak occurs after calling `startFullDrag()`. The `fullPDRTmpTargetWrapper` is then populated but never cleared.
> Fix is to call `clear()` on the `fullPDRTmpTargetWrapper`, very similar to https://github.com/openjdk/jfx/pull/448 ([JDK-8264330](https://bugs.openjdk.java.net/browse/JDK-8264330)).

Marked as reviewed by angorya (Author).

modules/javafx.graphics/src/main/java/javafx/scene/Scene.java line 3671:

> 3669:             pdrEventTarget.clear();
> 3670:             pdrEventTargets.clear();
> 3671:             fullPDRTmpTargetWrapper.clear();

the change looks ok to me.
is this the only place where the clear() is needed?

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PR: https://git.openjdk.org/jfx/pull/899