RFR: 8273485: Deadlock when also using Swing and exiting Fullscreen on Mac [v9]

[Florian Kirmaier]

> When using Swing it's possible to generate a Deadlock.
>  It's related to the nested eventloop started in enterFullScreenExitingLoop - and the RenderLock aquired when using setView in Scene.
>  Sample Programm and Threaddump are added to the ticket.
> 
> Removing the nested loop fixes the Problem. 
> I hope this doesn't have any side effect - so far i don't know of any.

Florian Kirmaier has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 10 commits:

 - JDK-8273485
   Fixing issue caused by wrong merge.
 - Merge remote-tracking branch 'origin/master' into JDK-8273485_swing-deadlock
   
   # Conflicts:
   #	modules/javafx.graphics/src/main/native-glass/mac/GlassViewDelegate.m
 - JDK-8273485
   Added check for null when calling initScreens
 - JDK-8273485
   Fixing toggle fullscreen!
 - JDK-8273485
   removed the toggle fullscreen before closing - to avoid the beep and improve the user experience
 - JDK-8273485
   Fixed Beep sound when closing a fullscreen window
 - JDK-8273485
   small cleanup of the changes.
 - JDK-8273485
   Removed the enter/leave nested event loop logic, for mac fullscreen
 - JDK-8273485
   Added unit-test
 - JDK-8273485
   Fixing deadlock when switching to fullscreen, when also swing is used.

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Changes: https://git.openjdk.org/jfx/pull/622/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=622&range=08
  Stats: 114 lines in 7 files changed: 70 ins; 39 del; 5 mod
  Patch: https://git.openjdk.org/jfx/pull/622.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/622/head:pull/622

PR: https://git.openjdk.org/jfx/pull/622