RFR: 4265389: JSplitPane does not support ComponentOrientation [v2]

[Prasanta Sadhukhan]

> JSplitPane's support of CompoentOrientation is not present so if orientation is RTL, it still renders left component on left and right component on right instead of other way around..
> Fix to make it support RTL orientation

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Review fix

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20214/files
  - new: https://git.openjdk.org/jdk/pull/20214/files/1996e542..8feaf6e9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20214&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20214&range=00-01

  Stats: 11 lines in 2 files changed: 4 ins; 3 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/20214.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20214/head:pull/20214

PR: https://git.openjdk.org/jdk/pull/20214