Adds code to trigger a scene update when a Window is restored This seems to solve https://bugs.openjdk.org/browse/JDK-8351867 and https://bugs.openjdk.org/browse/JDK-8146479
------------- Commit messages: - Ensure a redraw is performed after windows is restored Changes: https://git.openjdk.org/jfx/pull/1733/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1733&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8351867 Stats: 10 lines in 1 file changed: 10 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jfx/pull/1733.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1733/head:pull/1733 PR: https://git.openjdk.org/jfx/pull/1733
