RFR: Merge jfx19

[Kevin Rushforth]

Merge `jfx19` into `master`.

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Commit messages:
 - Merge jfx19
 - 8291502: Mouse or touch presses on a non-focusable region don't clear the focusVisible flag of the current focus owner
 - 8291588: Update boot JDK to 18.0.2

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jfx&pr=860&range=00.0
 - jfx19: https://webrevs.openjdk.org/?repo=jfx&pr=860&range=00.1

Changes: https://git.openjdk.org/jfx/pull/860/files
  Stats: 98 lines in 5 files changed: 82 ins; 1 del; 15 mod
  Patch: https://git.openjdk.org/jfx/pull/860.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/860/head:pull/860

PR: https://git.openjdk.org/jfx/pull/860