RFR: Merge jfx18 [v2]

[Kevin Rushforth]

> Final merge of `jfx18` into `master`.

Kevin Rushforth has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 32 additional commits since the last revision:

 - Merge jfx18
 - 8282093: LineChart path incorrect when outside lower bound
   
   Reviewed-by: aghaisas
 - 8271054: [REDO] Wrong stage gets focused after modal stage creation
   
   Reviewed-by: kcr, arapte
 - 8280840: Update libFFI to 3.4.2
   
   Reviewed-by: kcr, sykora
 - 8282100: Missed top/left bouncing for ScrollPane on Raspberry Pi with Touchscreen
   
   Reviewed-by: aghaisas
 - 8280020: Underline and line-through not straight in WebView
   
   Reviewed-by: kcr, arapte
 - 8269115: WebView paste event contains old data
   
   Reviewed-by: arapte, kcr
 - 8255940: localStorage is null after window.close()
   
   Reviewed-by: kcr, arapte
 - 8278759: PointerEvent: buttons property set to 0 when mouse down
   
   Reviewed-by: kcr, arapte
 - 8281089: JavaFX built with VS2019 and jlinked into JDK 11.x fails to start
   
   Reviewed-by: arapte, sykora
 - ... and 22 more: https://git.openjdk.java.net/jfx/compare/abb2b138...fe8dcbd1

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/755/files
  - new: https://git.openjdk.java.net/jfx/pull/755/files/fe8dcbd1..fe8dcbd1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=755&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=755&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jfx/pull/755.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/755/head:pull/755

PR: https://git.openjdk.java.net/jfx/pull/755