RFR: 8351867: No UI changes while iconified [v4]

[John Hendrikx]

> 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

John Hendrikx has updated the pull request incrementally with one additional commit since the last revision:

  Also repaint when going to maximized

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1733/files
  - new: https://git.openjdk.org/jfx/pull/1733/files/2539511b..c8d199cb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1733&range=03
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1733&range=02-03

  Stats: 35 lines in 1 file changed: 15 ins; 18 del; 2 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