As of OpenJFX 21, `EventTarget` has methods to add and remove event listeners. The `instanceof` checks in `com.sun.javafx.scene.control.ListenerHelper` should be removed and replaced by a simple call to the respective interface method.
------------- Commit messages: - Use new EventTarget methods in ListenerHelper Changes: https://git.openjdk.org/jfx/pull/1262/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1262&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8318204 Stats: 87 lines in 2 files changed: 1 ins; 78 del; 8 mod Patch: https://git.openjdk.org/jfx/pull/1262.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1262/head:pull/1262 PR: https://git.openjdk.org/jfx/pull/1262
