RFR: 8150709: Mac OSX and German Keyboard Layout (Y/Z) [v4]

[Martin Fox]

> This PR adds code to ensure that KeyCodeCombinations match KeyEvents as expected by more accurately mapping from a Mac key code to a Java key code based on the user’s active keyboard layout (the existing code assumes a US QWERTY layout). The new code first identifies a set of Mac keys which can produce different characters based on the user’s keyboard layout. A Mac key code outside that area is processed exactly as before. For a key inside the layout-sensitive area the code calls UCKeyTranslate to translate the key to an unshifted ASCII character based on the active keyboard and uses that to determine the Java key code.
> 
> When performing the reverse mapping for the Robot the code first uses the old QWERTY mapping to find a candidate key. If it lies in the layout-sensitive area the code then scans the entire area calling UCKeyTranslate until it finds a match. If the key lies outside the layout-sensitive area it’s processed exactly as before.
> 
> There are multiple duplicates of these bugs logged against Mac applications built with JavaFX.
> 
> https://bugs.openjdk.java.net/browse/JDK-8090257 Mac: Inconsistent KeyEvents with alternative keyboard layouts
> https://bugs.openjdk.java.net/browse/JDK-8088120 [Accelerator, Mac] CMD + Z accelerator is not working with French keyboard
> https://bugs.openjdk.java.net/browse/JDK-8087915 Mac: accelerator doesn't take into account azerty keyboard layout
> https://bugs.openjdk.java.net/browse/JDK-8150709 Mac OSX and German Keyboard Layout (Y/Z)

Martin Fox has updated the pull request incrementally with one additional commit since the last revision:

  Fixed whitespace error.

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/425/files
  - new: https://git.openjdk.java.net/jfx/pull/425/files/26a6fb0d..fb449d93

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=425&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=425&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/425.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/425/head:pull/425

PR: https://git.openjdk.java.net/jfx/pull/425