RFR: 8347359: RichTextArea API Tests [v2]

[Andy Goryachev]

> Additional RichTextArea API tests.

Andy Goryachev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 20 commits:

 - Merge remote-tracking branch 'origin/master' into 8347359.rta.api.tests
 - Merge remote-tracking branch 'origin/master' into 8347359.rta.api.tests
 - Merge remote-tracking branch 'origin/8348736.rta.followup.2' into 8347359.rta.api.tests
 - review comments
 - Merge remote-tracking branch 'origin/8348736.rta.followup.2' into
   8347359.rta.api.tests
 - newlines
 - check
 - cleanup
 - clamp
 - get text
 - ... and 10 more: https://git.openjdk.org/jfx/compare/307e3087...d6e9ba3f

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Changes: https://git.openjdk.org/jfx/pull/1677/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1677&range=01
  Stats: 1384 lines in 10 files changed: 1323 ins; 29 del; 32 mod
  Patch: https://git.openjdk.org/jfx/pull/1677.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1677/head:pull/1677

PR: https://git.openjdk.org/jfx/pull/1677