Fixed SpinnerSkin initialization using new Skin.install(). Also in this PR - fixing memory leaks in SpinnerSkin by properly removing all listeners and event filters added in the constructor, as well as any child Nodes.
NOTE: the fix requires both ListenerHelper [JDK-8294809](https://bugs.openjdk.org/browse/JDK-8294809) and Skin.install() [JDK-8290844](https://bugs.openjdk.org/browse/JDK-8290844) changes. ------------- Commit messages: - 8245145: cleanup - 8245145: cleanup - 8245145: cleanup - Merge remote-tracking branch 'origin/master' into 8245145.spinner.skin - 8245145: listener helper - Merge branch '8294809.listener.helper' into 8245145.spinner.skin - 8294809: whitespace - 8294809: no public api - 8294809: map change listener - Merge remote-tracking branch 'origin/master' into 8294809.listener.helper - ... and 39 more: https://git.openjdk.org/jfx/compare/3376228a...bcb9c5f2 Changes: https://git.openjdk.org/jfx/pull/904/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=904&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8245145 Stats: 61 lines in 3 files changed: 33 ins; 15 del; 13 mod Patch: https://git.openjdk.org/jfx/pull/904.diff Fetch: git fetch https://git.openjdk.org/jfx pull/904/head:pull/904 PR: https://git.openjdk.org/jfx/pull/904
