This PR fixes a memory leak, as a follow-up of [JDK-8241840](https://bugs.openjdk.java.net/browse/JDK-8241840).
The tests pass on desktop (Linux/macOS/Windows) and there is no regression on Android (see [JDK-8254605](https://bugs.openjdk.java.net/browse/JDK-8254605)). ------------- Commit messages: - Enable test back and include required sw pipeline - Nullify focusedWindow when window is closed and add null checks Changes: https://git.openjdk.java.net/jfx/pull/677/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=677&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8254956 Stats: 20 lines in 4 files changed: 11 ins; 6 del; 3 mod Patch: https://git.openjdk.java.net/jfx/pull/677.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/677/head:pull/677 PR: https://git.openjdk.java.net/jfx/pull/677
