RFR: 8341438: TextFlow: incorrect caretShape(), hitTest(), rangeShape() with non-empty padding/border [v5]

[Andy Goryachev]

> ## Summary
> This change adds new methods to the `TextFlow` which work correctly in the presence of non-empty insets (borders/padding). For backward compatibility, the old buggy methods are getting deprecated (not for removal). Also, adds new methods in Text which provide missing functionality.
> 
> ## Problem
> A number of methods in `TextFlow` fail to return correct values in the presence of non-empty insets (i.e. when either padding or border are set):
> - caretShape 
> - hitTest 
> - rangeShape
> 
> Additionally, the current API fail to provide strike-through shape, and account for line spacing in the range shape, a problem shared between the `TextFlow` and the `Text` classes.
> 
> ## Solution
> The solution is two-fold: 
> 1) deprecate the buggy methods (not for removal), adding explanations in their javadoc comments 
> 2) add new methods that behave correctly in the presence of non-empty insets and/or implementing the missing functionality.
> 
> The proposed solution retains the buggy methods for the purposes of backward compatibility in applications which employ the workarounds, while providing new APIs with additional parameters similar to those offered by the new TextLayout API https://bugs.openjdk.org/browse/JDK-8341670
> 
> ## Testing
> 
> Additional visualization of the data returned by the new APIs is available in the Monkey Tester using the following branch (in the Text and TextFlow pages):
> 
> https://github.com/andy-goryachev-oracle/MonkeyTest/tree/text.insets.corrected

Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:

  javadoc

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1817/files
  - new: https://git.openjdk.org/jfx/pull/1817/files/d466ebc9..a2099f02

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1817&range=04
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1817&range=03-04

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jfx/pull/1817.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1817/head:pull/1817

PR: https://git.openjdk.org/jfx/pull/1817