RFR: 8319844 : Text/TextFlow.hitTest() is incorrect in RTL orientation [v17]

[Karthik P K]

> In the `getHitInfo()` method of PrismTextLayout, RTL node orientation conditions were not considered, hence hit test values such as character index and insertion index values were incorrect.
> 
> Added checks for RTL orientation of nodes and  fixed the issue in `getHitInfo()` to calculate correct hit test values.
> 
> Added system tests to validate the changes.

Karthik P K has updated the pull request incrementally with one additional commit since the last revision:

  Add unit test

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1323/files
  - new: https://git.openjdk.org/jfx/pull/1323/files/130587c9..7ef09bf5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1323&range=16
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1323&range=15-16

  Stats: 228 lines in 5 files changed: 218 ins; 3 del; 7 mod
  Patch: https://git.openjdk.org/jfx/pull/1323.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1323/head:pull/1323

PR: https://git.openjdk.org/jfx/pull/1323