RFR: Merge jfx18

[Kevin Rushforth]

Merge `jfx18` into `master`.

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Commit messages:
 - Merge jfx18
 - 8271085: TabPane: Redundant API docs
 - 8279345: Realign class docs of LightBase and subclasses

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.java.net/jfx/pull/732/files
  Stats: 325 lines in 6 files changed: 118 ins; 135 del; 72 mod
  Patch: https://git.openjdk.java.net/jfx/pull/732.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/732/head:pull/732

PR: https://git.openjdk.java.net/jfx/pull/732