Cleanup memory leaks and malicious side-effects (produced by eventhandlers and listeners that were not removed) when replacing a ListViewSkin.
The fix is to remove the listeners/handlers as needed. Added tests that failed before and pass after the fix. It's part of the ongoing cleanup effort [JDK-8241364](https://bugs.openjdk.java.net/browse/JDK-8241364). ------------- Commit messages: - 8246195: ListViewSkin/Behavior: misbehavior on switching skin Changes: https://git.openjdk.java.net/jfx/pull/247/files Webrev: https://webrevs.openjdk.java.net/jfx/247/webrev.00 Issue: https://bugs.openjdk.java.net/browse/JDK-8246195 Stats: 269 lines in 7 files changed: 252 ins; 9 del; 8 mod Patch: https://git.openjdk.java.net/jfx/pull/247.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/247/head:pull/247 PR: https://git.openjdk.java.net/jfx/pull/247
