RFR: 8190264: JScrollBar ignores its border when using macOS Mac OS X Aqua look and feel [v11]

[Alisen Chung]

> Adjusted the AquaLF scrollbar to account for border inset settings when dragging the thumb and clicking on the track.

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

  added check for other L&Fs, added newline to test

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6374/files
  - new: https://git.openjdk.java.net/jdk/pull/6374/files/9bf899fa..0a6283bd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6374&range=10
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6374&range=09-10

  Stats: 23 lines in 1 file changed: 19 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6374.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6374/head:pull/6374

PR: https://git.openjdk.java.net/jdk/pull/6374