RFR: 8319844 : Text/TextFlow.hitTest() is incorrect in RTL orientation [v13]

[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 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 13 additional commits since the last revision:

 - Merge branch 'master' into rtl_hittest_issue
 - Code refactoring
 - Review comments
 - Fix emoji issue
 - Inline node issue fix
 - Code review changes
 - Fix issue with multiline text
 - Fix issue with RTL text within LTR text
 - Review changes
 - Fix multiline text insertion index calculation issue
 - ... and 3 more: https://git.openjdk.org/jfx/compare/96c496a0...e3812732

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1323/files
  - new: https://git.openjdk.org/jfx/pull/1323/files/72287851..e3812732

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1323&range=12
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1323&range=11-12

  Stats: 294814 lines in 6614 files changed: 173890 ins; 83927 del; 36997 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