RFR: 8347715: RichTextArea Follow-up: Minor Bugs [v2]

[Andy Goryachev]

> Found during writing the API tests:
> 
> - setUseContentHeight/Width (true -> on)

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

  revert nullable change

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1676/files
  - new: https://git.openjdk.org/jfx/pull/1676/files/04bde3e4..c856986e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1676&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1676&range=00-01

  Stats: 21 lines in 2 files changed: 12 ins; 3 del; 6 mod
  Patch: https://git.openjdk.org/jfx/pull/1676.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1676/head:pull/1676

PR: https://git.openjdk.org/jfx/pull/1676