RFR: 8371070: RichParagraph enhancements [v6]

[Andy Goryachev]

> Addressing the user feedback:
> 
> In RichParagraph you have a note to make getSegments() public.  It would be helpful if it was.
> 
> 
> Adding two methods to the `RichParagraph` class:
> 
> - getSegmentCount()
> - getSegment(int index)
> 
> Decided against exposing a List since it would require additional allocation.  Some of the callers seems to implement special logic when the number of segments is 0 anyway.

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

  npe

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1966/files
  - new: https://git.openjdk.org/jfx/pull/1966/files/b4691640..64f7836d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1966&range=05
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1966&range=04-05

  Stats: 4 lines in 2 files changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1966.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1966/head:pull/1966

PR: https://git.openjdk.org/jfx/pull/1966