RFR: 8319844 : Text/TextFlow.hitTest() is incorrect in RTL orientation [v15]

[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:

  Simplified approach

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1323/files
  - new: https://git.openjdk.org/jfx/pull/1323/files/f36199fd..1376441b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1323&range=14
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1323&range=13-14

  Stats: 284 lines in 5 files changed: 14 ins; 227 del; 43 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