RFR: 8351368: RichTextArea: exception pasting from Word [v2]

[Andy Goryachev]

> The original code used String attribute keys.
> 
> I'd like to backport this fix to jfx24u.

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

  ==

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1731/files
  - new: https://git.openjdk.org/jfx/pull/1731/files/b99db26d..00dee1d3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1731&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1731&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1731.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1731/head:pull/1731

PR: https://git.openjdk.org/jfx/pull/1731