RFR: 8282217: Key events (key char and key code) changed for Swiss keyboard [v2]

[Alisen Chung]

> Removed check for MapVirtualKeyEx return value causing some keys to become undefined

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  readded check for dead key leading bit, added separate check for group separator

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11887/files
  - new: https://git.openjdk.org/jdk/pull/11887/files/bcaa7569..7f4d359b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11887&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11887&range=00-01

  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11887.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11887/head:pull/11887

PR: https://git.openjdk.org/jdk/pull/11887