RFR: 8255015: Inconsistent illumination of 3D shape by PointLight [v6]

[Andreas Heger]

> The inconsistent illumination happens on Macs with retina displays only if the 3D shape is placed in a SubScene. The light sources are located with wrong coordinates in sub scenes and this causes a different illumination. The wrong coordinates for the light sources come from the fact that the retina pixel scale factors are not used in a SubScene.
> 
> With this pull request, the retina pixel scale factors will be also used in SubScenes and this should resolve the bug [https://bugs.openjdk.java.net/browse/JDK-8255015](url)

Andreas Heger has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8255015: JUnit Test class added.

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/531/files
  - new: https://git.openjdk.java.net/jfx/pull/531/files/a3677124..3e1af1c3

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=531&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=531&range=04-05

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/531.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/531/head:pull/531

PR: https://git.openjdk.java.net/jfx/pull/531