Fixing deadlock when calling Application.launch in the FXThread after Platform.startup
------------- Commit messages: - JDK-8263322 Changes: https://git.openjdk.java.net/jfx/pull/421/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=421&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8263322 Stats: 85 lines in 2 files changed: 84 ins; 0 del; 1 mod Patch: https://git.openjdk.java.net/jfx/pull/421.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/421/head:pull/421 PR: https://git.openjdk.java.net/jfx/pull/421
