RFR: 8341440: ScrollPane: no immediate effect changing fitWidth/fitHeight [v2]

[Andy Goryachev]

> - fixed the issue
> - added unit tests
> - clarified default value of `ScrollPane.fitWidth` and `ScrollPane.fitHeight` properties
> 
> No CSR is needed as it is a minor clarification.

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

  you say unrelated, I say un-related

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1597/files
  - new: https://git.openjdk.org/jfx/pull/1597/files/971e9ccf..5739a394

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1597&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1597&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1597.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1597/head:pull/1597

PR: https://git.openjdk.org/jfx/pull/1597